public static double solveString(string anMxParserString)
{
org.mariuszgromada.math.mxparser.Expression expr = new org.mariuszgromada.math.mxparser.Expression(anMxParserString);
double result = expr.calculate();
if (double.IsNaN(result)) {
//throw new Exception(expr.getErrorMessage());
throw new Exception("Couldn't calculate: {\n"+anMxParserString+"\n}, mxparser error: \n---\n"+expr.getErrorMessage()+"---\n" );
}
return result;
}
public static double[] GetInputData(double frequency, uint length, double samplingRate, Argument timeArg, Argument frequencyArg, org.mariuszgromada.math.mxparser.Expression expression)
{
return(DSP.Generate.ToneSampling2((t, freq) =>
{
timeArg.setArgumentValue(t);
frequencyArg.setArgumentValue(freq);
var w = expression.calculate();
if (double.IsNaN(w) || double.IsInfinity(w))
{
throw new CalculateException("During calculate value 'NaN' or 'Infinite' occurs");
}
return w;
}, frequency, samplingRate, length));
}
/**
* Function derivative
*
* @param pos the token position
* @param derivativeType the type of derivative (left, right, etc...)
*/
private void DERIVATIVE_NTH(int pos, int derivativeType)
{
const double DEF_EPS = 1E-6;
/*
* Default max number of steps
*/
const int DEF_MAX_STEPS = 20;
List<FunctionParameter> derParams = getFunctionParameters(pos, tokensList);
/*
* Get internal function strinng
* 1st - parameter
*/
FunctionParameter funParam = derParams[0];
/*
* Get n-th
* 2nd - parameter
*/
FunctionParameter nParam = derParams[1];
/*
* Get argument
* 3rd - parameter
*/
FunctionParameter xParam = derParams[2];
ArgumentParameter x = getParamArgument(xParam.paramStr);
if (x.presence == Argument.NOT_FOUND) {
updateMissingTokens(xParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(funParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(nParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
}
Expression funExp = new Expression(funParam.paramStr, funParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
Expression nExp = new Expression(nParam.paramStr, nParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
double n = nExp.calculate();
double x0 = x.argument.getArgumentValue();
double eps = DEF_EPS;
int maxSteps = DEF_MAX_STEPS;
if (derParams.Count == 5) {
FunctionParameter epsParam = derParams[3];
FunctionParameter maxStepsParam = derParams[4];
if (x.presence == Argument.NOT_FOUND) {
updateMissingTokens(epsParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(maxStepsParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
}
Expression epsExpr = new Expression(epsParam.paramStr, epsParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
Expression maxStepsExp = new Expression(maxStepsParam.paramStr, maxStepsParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
eps = epsExpr.calculate();
maxSteps = (int)Math.Round(maxStepsExp.calculate());
}
if (derivativeType == Calculus.GENERAL_DERIVATIVE) {
double left = Calculus.derivativeNth(funExp, n, x.argument, x0, Calculus.LEFT_DERIVATIVE, eps, maxSteps);
double right = Calculus.derivativeNth(funExp, n, x.argument, x0, Calculus.RIGHT_DERIVATIVE, eps, maxSteps);
calcSetDecreaseRemove(pos, (left + right) / 2.0);
} else if (derivativeType == Calculus.LEFT_DERIVATIVE) {
double left = Calculus.derivativeNth(funExp, n, x.argument, x0, Calculus.LEFT_DERIVATIVE, eps, maxSteps);
calcSetDecreaseRemove(pos, left);
} else {
double right = Calculus.derivativeNth(funExp, n, x.argument, x0, Calculus.RIGHT_DERIVATIVE, eps, maxSteps);
calcSetDecreaseRemove(pos, right);
}
clearParamArgument(x);
}
private void genButton_Click(object sender, EventArgs e)
{
Random num1Gen = new Random();
Random num2Gen = new Random();
int num1Min;
int num1Max;
Random randOperator = new Random();
if (string.IsNullOrWhiteSpace(firstNum1.Text)) //Ngecek jika kolom yang akan digunakan kosong atau hanya berupa spasi.
{
num1Min = 1;
}
else
{
num1Min = int.Parse(firstNum1.Text);
}
if (string.IsNullOrWhiteSpace(firstNum2.Text))//Ngecek jika kolom yang akan digunakan kosong atau hanya berupa spasi.
{
num1Max = 100;
}
else
{
num1Max = int.Parse(firstNum2.Text) + 1;
}
if (reverseCheck(num1Min, num1Max)) //Ngecek jika angka minimum ama maximum ketuker atau enggak.
{
//Problem Generator
int retryCount = 0; //Ngitung berapa kali ngeGenerate ulang
bool decimals = true;
var stopWatch = System.Diagnostics.Stopwatch.StartNew(); //Ngeinitialize sekaligus mulai ngitung waktu sampai fungsi Stopwatch dihentikan.
while (decimals == true) //Ngecek jika Decimal bernilai True atau engga. Jika benar, jalankan kode ini secara berulang-ulang sampai Decimal bernilai selain True.
{
Random questionTypeGen = new Random();
Double result;
string questionRandResult = questionGenerator(Convert.ToInt32(iterationValue.Text) - 1, num1Min, num1Max); //Manggil Method questionGenerator sambil masukin iterationValue ama range angka random.
string questionString = questionRandResult.Replace("*", " X "); //Ngeganti string yang bisa dibaca komputer ke tulisan yang bisa dibaca manusia.
questionString = questionString.Replace("+", " + "); //Ngeganti string yang bisa dibaca komputer ke tulisan yang bisa dibaca manusia.
questionString = questionString.Replace("-", " - "); //Ngeganti string yang bisa dibaca komputer ke tulisan yang bisa dibaca manusia.
questionString = questionString.Replace("/", " : "); //Ngeganti string yang bisa dibaca komputer ke tulisan yang bisa dibaca manusia.
Expression ex = new Expression(questionRandResult);
result = ex.calculate(); //Ngekalkulasi questionRandResult dengan MathFunction.MathParser.Calculate.
if (Math.Abs(result % 1) < Double.Epsilon) //Ngecek jika result merupakan angka dengan desimal
{
stopWatch.Stop(); //hentikan menghitung waktu kalkulasi
var elapsedTime = stopWatch.ElapsedMilliseconds; //memasukan waktu kalkulasi ke variabel.
Debug.WriteLine("the number " + result.ToString() + " is not decimal");
decimals = false;
logAdd("Succeeded generating a random problem in " + elapsedTime + " millisecond, with each value between " + firstNum1.Text + " to " + firstNum2.Text + ", with an iteration number of " + iterationValue.Text + ", regenerated " + retryCount + " times in attempt to search for the non-decimal result.");
questionProblem.Text = questionString;
resultNum.Text = result.ToString();
}
else
{
if (noDecimalCheckbox.Checked == false)
{
stopWatch.Stop(); //hentikan menghitung waktu kalkulasi
var elapsedTime = stopWatch.ElapsedMilliseconds; //memasukan waktu kalkulasi ke variabel.
logAdd("Succeeded generating a random problem in " + elapsedTime + " millisecond, with each value between " + firstNum1.Text + " to " + firstNum2.Text + ", with an iteration number of " + iterationValue.Text + ", regenerated " + retryCount + " times in attempt to search for the non-decimal result.");
Debug.WriteLine("the number " + result.ToString() + " is decimal");
decimals = false;
double resultNew = Math.Round(result, Convert.ToInt32(decimalNumbers.Text), MidpointRounding.AwayFromZero); //Jika noDecimalCheckbox tidak dicentang, maka hasil penghitungan tidak dicek dan langsung ditampilkan.
questionProblem.Text = questionString;
resultNum.Text = resultNew.ToString();
}
else
{
Debug.WriteLine("the number " + result.ToString() + " is decimal");
decimals = true; //mengulang kalkulasi sambil menambahkan retryCount dengan 1
retryCount++;
}
}
}
}
else
{
MessageBox.Show("The minimum value should not exceed the maximum value. Please recheck your input.", "Error", MessageBoxButtons.OK); //Jika
}
}
/**
* Calculates function f(x0) (given as expression) assigning Argument x = x0;
*
*
* @param f the expression
* @param x the argument
* @param x0 the argument value
*
* @return f.calculate()
*
* @see Expression
*/
public static double getFunctionValue(Expression f, Argument x, double x0)
{
x.setArgumentValue(x0);
return f.calculate();
}
private void Window_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.NumPad0 || (IsKeyboardShift && e.Key == Key.D0))
{
calc("0");
}
else if (e.Key == Key.NumPad1 || (IsKeyboardShift && e.Key == Key.D1))
{
calc("1");
}
else if (e.Key == Key.NumPad2 || (IsKeyboardShift && e.Key == Key.D2))
{
calc("2");
}
else if (e.Key == Key.NumPad3 || (IsKeyboardShift && e.Key == Key.D3))
{
calc("3");
}
else if (e.Key == Key.NumPad4 || (IsKeyboardShift && e.Key == Key.D4))
{
calc("4");
}
else if (e.Key == Key.NumPad5 || (IsKeyboardShift && e.Key == Key.D5))
{
calc("5");
}
else if (e.Key == Key.NumPad6 || (IsKeyboardShift && e.Key == Key.D6))
{
calc("6");
}
else if (e.Key == Key.NumPad7 || (IsKeyboardShift && e.Key == Key.D7))
{
calc("7");
}
else if (e.Key == Key.NumPad8 || (IsKeyboardShift && e.Key == Key.D8))
{
calc("8");
}
else if (e.Key == Key.NumPad9 || (IsKeyboardShift && e.Key == Key.D9))
{
calc("9");
}
else if (e.Key == Key.D5)
{
calc("(");
}
else if (e.Key == Key.Oem4)
{
calc(")");
}
else if (e.Key == Key.OemPlus || e.Key == Key.Add)
{
calc("+");
}
else if (e.Key == Key.OemMinus || e.Key == Key.Subtract)
{
calc("-");
}
else if (e.Key == Key.Multiply || e.Key == Key.Oem5)
{
calc("*");
}
else if (e.Key == Key.Divide || (IsKeyboardShift && e.Key == Key.Oem2))
{
calc("/");
}
else if (e.Key == Key.OemComma || (IsKeyboardShift && e.Key == Key.OemPeriod) || e.Key == Key.Decimal)
{
calc(",");
}
else if (e.Key == Key.S)
{
org.mariuszgromada.math.mxparser.Expression expression = new org.mariuszgromada.math.mxparser.Expression("sin(90)");
double result = expression.calculate();
}
else if (e.Key == Key.Enter)
{
calc("=");
}
else if (IsKeyboardShift && e.Key == Key.Oem3)
{
calc("#");
}
else if (e.Key == Key.Oem8)
{
calc("!");
}
}
private void Conversion_click(object sender, RoutedEventArgs e)
{
if (MathExp.Any())
{
var detailSelectedStr = "question";
if (Conversion_ask.SelectedValue.ToString() == "uo_length")
{
var inputUnit = Units_length.SelectedValue;
if (inputUnit.ToString() != detailSelectedStr)
{
Expression mm = new Expression($"(({MathExp})*[{inputUnit}])/[mm]");
WinCnversion.FeedTxt1($"Millimetre: {mm.calculate()}");
WinCnversion.ShowTxt1();
Expression cm = new Expression($"(({MathExp})*[{inputUnit}])/[cm]");
WinCnversion.FeedTxt2($"Centimeter: {cm.calculate()}");
WinCnversion.ShowTxt2();
Expression m = new Expression($"(({MathExp})*[{inputUnit}])/[m]");
WinCnversion.FeedTxt3($"Meter: {m.calculate()}");
WinCnversion.ShowTxt3();
Expression km = new Expression($"(({MathExp})*[{inputUnit}]) / [km]");
WinCnversion.FeedTxt4($"Kilometer: {km.calculate()}");
WinCnversion.ShowTxt4();
Expression inch = new Expression($"(({MathExp})*[{inputUnit}])/[inch]");
WinCnversion.FeedTxt5($"Inch: {inch.calculate()}");
WinCnversion.ShowTxt5();
Expression ft = new Expression($"(({MathExp})*[{inputUnit}])/[ft]");
WinCnversion.FeedTxt6($"Foot: {ft.calculate()}");
WinCnversion.ShowTxt6();
}
else
{
DisplayResult("Select a unit");
}
}
else if (Conversion_ask.SelectedValue.ToString() == "uo_mass")
{
var inputUnit = Units_mass.SelectedValue;
if (inputUnit.ToString() != detailSelectedStr)
{
Expression mg = new Expression($"(({MathExp})*[{inputUnit}])/[mg]");
WinCnversion.output_1b.Text = $"Milligram: {mg.calculate()}";
WinCnversion.output_1b.Visibility = Visibility.Visible;
Expression gr = new Expression($"(({MathExp})*[{inputUnit}])/[gr]");
WinCnversion.output_2b.Text = $"Gram: {gr.calculate()}";
WinCnversion.output_2b.Visibility = Visibility.Visible;
Expression kg = new Expression($"(({MathExp})*[{inputUnit}])/[kg]");
WinCnversion.output_3b.Text = $"Kilogram: {kg.calculate()}";
WinCnversion.output_3b.Visibility = Visibility.Visible;
Expression oz = new Expression($"(({MathExp})*[{inputUnit}])/[oz]");
WinCnversion.output_4b.Text = $"Ounce: {oz.calculate()}";
WinCnversion.output_4b.Visibility = Visibility.Visible;
Expression lb = new Expression($"(({MathExp})*[{inputUnit}])/[lb]");
WinCnversion.output_5b.Text = $"Pound: {lb.calculate()}";
WinCnversion.output_5b.Visibility = Visibility.Visible;
}
else
{
DisplayResult("Select a unit");
}
}
else if (Conversion_ask.SelectedValue.ToString() == "uo_info")
{
var inputUnit = Units_info.SelectedValue;
if (inputUnit.ToString() != detailSelectedStr)
{
Expression b = new Expression($"(({MathExp})*[{inputUnit}])/[B]");
WinCnversion.output_1b.Text = $"Byte: {b.calculate()}";
WinCnversion.output_1b.Visibility = Visibility.Visible;
Expression kb = new Expression($"(({MathExp})*[{inputUnit}])/[kB]");
WinCnversion.output_2b.Text = $"Kilobyte: {kb.calculate()}";
WinCnversion.output_2b.Visibility = Visibility.Visible;
Expression mb = new Expression($"(({MathExp})*[{inputUnit}])/[MB]");
WinCnversion.output_3b.Text = $"Megabyte: {mb.calculate()}";
WinCnversion.output_3b.Visibility = Visibility.Visible;
Expression gb = new Expression($"(({MathExp})*[{inputUnit}])/[GB]");
WinCnversion.output_4b.Text = $"Gigabyte: {gb.calculate()}";
WinCnversion.output_4b.Visibility = Visibility.Visible;
Expression tb = new Expression($"(({MathExp})*[{inputUnit}])/[TB]");
WinCnversion.output_5b.Text = $"Terabyte: {tb.calculate()}";
WinCnversion.output_5b.Visibility = Visibility.Visible;
}
else
{
DisplayResult("Select a unit");
}
}
else if (Conversion_ask.SelectedValue.ToString() == "uo_time")
{
var inputUnit = Units_time.SelectedValue;
if (inputUnit.ToString() != detailSelectedStr)
{
Expression sec = new Expression($"(({MathExp})*[{inputUnit}])/[s]");
WinCnversion.output_1b.Text = $"Second: {sec.calculate()}";
WinCnversion.output_1b.Visibility = Visibility.Visible;
Expression min = new Expression($"(({MathExp})*[{inputUnit}])/[min]");
WinCnversion.output_2b.Text = $"Minute: {min.calculate()}";
WinCnversion.output_2b.Visibility = Visibility.Visible;
Expression mb = new Expression($"(({MathExp})*[{inputUnit}])/[h]");
WinCnversion.output_3b.Text = $"Hour: {mb.calculate()}";
WinCnversion.output_3b.Visibility = Visibility.Visible;
}
else
{
DisplayResult("Select a unit");
}
}
else if (Conversion_ask.SelectedValue.ToString() == "uo_percent")
{
Expression regularMath = new Expression(MathExp);
var single = regularMath.calculate();
Expression toBig = new Expression($"{single}*100");
WinCnversion.output_1b.Text = $"{single} is {toBig.calculate()}%";
WinCnversion.output_1b.Visibility = Visibility.Visible;
Expression toSm = new Expression($"{single}/100");
WinCnversion.output_2b.Text = $"{single}% is {toSm.calculate()}";
WinCnversion.output_2b.Visibility = Visibility.Visible;
ClearAll();
}
else if (Conversion_ask.SelectedValue.ToString() == "uo_number")
{
bool success = int.TryParse(MathExp, out int my_regular);
if (success)
{
WinCnversion.output_1b.Text = $"Integer: {my_regular}";
WinCnversion.output_1b.Visibility = Visibility.Visible;
var my_bin = ToBinary(my_regular);
WinCnversion.output_2b.Text = $"Binary: {my_bin}";
WinCnversion.output_2b.Visibility = Visibility.Visible;
var my_oct = Convert.ToString(my_regular, 8);
WinCnversion.output_3b.Text = $"Octal: {my_oct}";
WinCnversion.output_3b.Visibility = Visibility.Visible;
var my_hex = Convert.ToString(my_regular, 16);
WinCnversion.output_4b.Text = $"Hexadecimal: {my_hex}";
WinCnversion.output_4b.Visibility = Visibility.Visible;
ClearAll();
}
else
{
WinCnversion.output_1b.Text = $"Not a integer or other errors";
WinCnversion.output_1b.Visibility = Visibility.Visible;
}
}
}
else
{
var warningMsg = "An input number required";
DisplayResult(warningMsg);
}
}
/**
* IF function
*
* @param pos the token position
*/
private void IF_CONDITION(int pos)
{
/*
* Get condition string
* 1st parameter
*/
List<FunctionParameter> ifParams = getFunctionParameters(pos, tokensList);
FunctionParameter ifParam = ifParams[0];
Expression ifExp = new Expression(ifParam.paramStr, ifParam.tokens, argumentsList, functionsList, constantsList, KEEP_ULP_ROUNDING_SETTINGS);
if (verboseMode == true)
ifExp.setVerboseMode();
ifSetRemove(pos, ifExp.calculate());
}
/**
* Gets recursive argument value
*
* @param index the index
*
* @return value as double
*/
public double getArgumentValue(double index)
{
/*
* Remember starting index
*/
if (recursiveCounter == -1)
startingIndex = (int)Math.Round(index);
int recSize = baseValues.Count;
int idx = (int)Math.Round(index);
/*
* Count recursive calls
*/
recursiveCounter++;
if ((recursiveCounter <= startingIndex) && (idx <= startingIndex)) {
/*
* if recursive counter is still lower than starting index
* and current index is not increasing
*/
if ((idx >= 0) && (idx < recSize) && (!Double.IsNaN( baseValues[idx] )) ) {
/*
* decrease recursive counter and return value
* if recursive value for the current index was already
* calculated and remembered in the base values table
*/
recursiveCounter--;
return baseValues[idx];
}
else if (idx >= 0) {
/*
* value is to be calculated by the recursive calls
*/
/*
* Set n to the current index
*/
n.setArgumentValue(idx);
/*
* create new expression
*/
Expression newExp = new Expression(
base.argumentExpression.expressionString
, base.argumentExpression.argumentsList
, base.argumentExpression.functionsList
, base.argumentExpression.constantsList
,Expression.INTERNAL);
newExp.setDescription(base.getArgumentName());
//newExp.setRecursiveMode();
if (base.getVerboseMode() == true)
{
//System.out.println(super.getVerboseMode() + ", " +super.getArgumentName() + ", " + super.argumentExpression.expressionString + "," + "VERBOSE MODE for recurssion");
newExp.setVerboseMode();
}
/*
* perform recursive call
*/
double value = newExp.calculate();
/*
* remember calculated in the base values array
*/
addBaseCase(idx, value);
/*
* decrease recursive counter and return value
*/
recursiveCounter--;
return value;
} else {
/*
* decrease recursive counter and
* return Double.NaN for negative index call
*/
recursiveCounter--;
return Double.NaN;
}
} else {
/* stop never ending loop
* decrease recursive counter and
* return Double.NaN
*/
recursiveCounter--;
return Double.NaN;
}
}
/*=================================================
*
* Constructors
*
*=================================================
*/
/**
* Default constructor - creates argument based on the argument definition string.
*
* @param argumentDefinitionString Argument definition string, i.e.:
* <ul>
* <li>'x' - only argument name
* <li>'x=5' - argument name and argument value
* <li>'x=2*5' - argument name and argument value given as simple expression
* <li>'x=2*y' - argument name and argument expression (dependent argument 'x' on argument 'y')
* </ul>
*
* @param elements Optional parameters (comma separated) such as Arguments, Constants, Functions
*/
public Argument(String argumentDefinitionString, params PrimitiveElement[] elements)
: base(Argument.TYPE_ID)
{
if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.nameOnlyTokenRegExp)) {
argumentName = argumentDefinitionString;
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = FREE_ARGUMENT;
argumentExpression = new Expression(elements);
}
else if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.constArgDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(argumentDefinitionString);
argumentName = headEqBody.headTokens[0].tokenStr;
Expression bodyExpr = new Expression(headEqBody.bodyStr);
double bodyValue = bodyExpr.calculate();
if ((bodyExpr.getSyntaxStatus() == Expression.NO_SYNTAX_ERRORS) && (bodyValue != Double.NaN)) {
argumentExpression = new Expression();
argumentValue = bodyValue;
argumentType = FREE_ARGUMENT;
}
else {
argumentExpression = bodyExpr;
addDefinitions(elements);
argumentType = DEPENDENT_ARGUMENT;
}
}
else if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.functionDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(argumentDefinitionString);
argumentName = headEqBody.headTokens[0].tokenStr;
argumentExpression = new Expression(headEqBody.bodyStr, elements);
argumentExpression.setDescription(headEqBody.headStr);
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = DEPENDENT_ARGUMENT;
n = new Argument(headEqBody.headTokens[2].tokenStr);
}
else {
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = FREE_ARGUMENT;
argumentExpression = new Expression();
argumentExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + argumentDefinitionString + "] " + "Invalid argument definition (patterns: 'x', 'x=5', 'x=5+3/2', 'x=2*y').");
}
setSilentMode();
description = "";
}
/**
* Constructor for function definition in natural math language,
* for instance providing on string "f(x,y) = sin(x) + cos(x)"
* is enough to define function "f" with parameters "x and y"
* and function body "sin(x) + cos(x)".
*
* @param constantDefinitionString Constant definition in the form
* of one String, ie "c = 2" or "c = 2*sin(pi/3)"
* @param elements Optional parameters (comma separated) such as Arguments, Constants, Functions
*/
public Constant(String constantDefinitionString, params PrimitiveElement[] elements)
: base(Constant.TYPE_ID)
{
description = "";
syntaxStatus = SYNTAX_ERROR_OR_STATUS_UNKNOWN;
relatedExpressionsList = new List<Expression>();
if (mXparser.regexMatch(constantDefinitionString, ParserSymbol.constArgDefStrRegExp))
{
HeadEqBody headEqBody = new HeadEqBody(constantDefinitionString);
constantName = headEqBody.headTokens[0].tokenStr;
Expression bodyExpression = new Expression(headEqBody.bodyStr, elements);
constantValue = bodyExpression.calculate();
syntaxStatus = bodyExpression.getSyntaxStatus();
errorMessage = bodyExpression.getErrorMessage();
}
else errorMessage = "[" + constantDefinitionString + "] " + "--> pattern not mathes: " + ParserSymbol.constArgDefStrRegExp;
}
//
// Funkcja wywoływana przez wątek do rysowania wykresów - tutaj plotujemy model
//
void worker_DoWork2(object sender, DoWorkEventArgs e)
{
plotBusy = true; // wątek rysowania jest zajęty
// Tymczasowe równanie - jest nadpisywane w różnych miejscach kodu
eq = new org.mariuszgromada.math.mxparser.Expression(equationString);
// Lista tokenów (argumentów) dodawana do listy łańcuchów znaków argumentów
List <Token> tokensList = eq.getCopyOfInitialTokens();
foreach (Token t in tokensList)
{
if (t.tokenTypeId == Token.NOT_MATCHED)
{
if (!argumentsString.Contains(t.tokenStr))
{
argumentsString.Add(t.tokenStr);
}
}
}
// Rozdzielenie argumentów przecinkami
commaSeparatedArguments = string.Join(", ", argumentsString);
// Utworzenie funkcji na podstawie argumentów i równania
f = new Function("f(" + commaSeparatedArguments + ") = " + equationString);
// Wyłapywanie błędów równania
if (argumentsString.ToArray().Length < 1)
{
argumentsString.Clear();
argumentsString = new List <string>();
equationString = "";
eq = new org.mariuszgromada.math.mxparser.Expression();
System.GC.Collect(); // <- Garbage Collector
algorithm.ClearAlgorithm();
return;
}
if (!eq.checkLexSyntax())
{
argumentsString.Clear();
argumentsString = new List <string>();
equationString = "";
eq = new org.mariuszgromada.math.mxparser.Expression();
System.GC.Collect(); // <- Garbage Collector
algorithm.ClearAlgorithm();
return;
}
if (eq.checkSyntax())
{
argumentsString.Clear();
argumentsString = new List <string>();
equationString = "";
eq = new org.mariuszgromada.math.mxparser.Expression();
System.GC.Collect(); // <- Garbage Collector
algorithm.ClearAlgorithm();
return;
}
foreach (var arg in argumentsString)
{
if (arg.Length < 2 || !arg.Contains("x"))
{
argumentsString.Clear();
argumentsString = new List <string>();
equationString = "";
eq = new org.mariuszgromada.math.mxparser.Expression();
System.GC.Collect(); // <- Garbage Collector
algorithm.ClearAlgorithm();
return;
}
}
// Jeśli liczba argumentów > 1 to rysujemy warstwice
if (arguments.ToArray().Length > 1)
{
model.Title = "Warstwice: "; // tytuł modelu to warstwice
List <double[]> xy = new List <double[]>(); // lista tablic zmiennych double przechowująca minimum i maximum konkretnych argumentów
// Zapisywanie tych zmiennych jest potrzebne do określenia granic wykresów
foreach (var arg in arguments)
{
xy.Add(ArrayBuilder.CreateVector(arg.Minimum, arg.Maximum, p));
}
// Pomocnicza tablica łańcuchów znaków argumentów funkcji (trochę czarów się tutaj dzieje)
// Finalnie infunc powinien zawierać łańcuchy znaków postaci:
// Przykład dla 2 argumentów: 0.125, 1.216
// Przykład dla 3 argumentów: 0.125, 1.216, 0
// Przykład dla 4 argumentów: 0.125, 1.216, 0, 0
// Zera na końcu są wstawiane dlatego, że spłaszczamy wielowymiarowy wykres do postaci warstwic
var infunc = new string[p, p];
for (int i = 0; i < p; ++i)
{
for (int j = 0; j < p; ++j)
{
for (int k = 0; k < xy.ToArray().Length; ++k)
{
// Jeśli jest to pierwszy argument to dodajemy go po prostu do łańcucha znaków
if (k == 0)
{
infunc[i, j] += xy[k][i].ToString().Replace(',', '.');
}
// Jeżeli jest to drugi argument to dodajemy go do łańcucha znaków z przecinkiem przed wartością
if (k == 1)
{
infunc[i, j] += "," + xy[k][j].ToString().Replace(',', '.');
}
// Jeżeli jest to każdy kolejny argument to dodajemy 0 do łańcucha znaków z przecinkiem przed
if (k > 1)
{
infunc[i, j] += ", 0";
}
}
}
}
// Tablica zawierająca wyrażenia do obliczenia - korzysta z poprzedniej tablicy pomocniczej do określenia tych wyrażeń
var data = new double[p, p];
for (int i = 0; i < p; ++i)
{
for (int j = 0; j < p; ++j)
{
int progressPercentage = Convert.ToInt32(((double)i / p) * 100);
org.mariuszgromada.math.mxparser.Expression equa = new org.mariuszgromada.math.mxparser.Expression("f(" + infunc[i, j] + ")", f);
data[i, j] = equa.calculate();
(sender as BackgroundWorker).ReportProgress(progressPercentage);
}
}
buffer = new PositionsBuffer();
sigma = data;
// Tworzenie zmiennej kontur - wykorzystywana do rysowania warstwic
var cs = new ContourSeries
{
Color = OxyColors.Red,
LabelBackground = OxyColors.White,
ColumnCoordinates = xy[0],
RowCoordinates = xy[1],
Data = data
};
// Dodanie kontur do modelu
model.Series.Add(cs);
}
// Jeśli liczba argumentów = 1 to rysujemy wykres
else
{
p = p * 30; // zmieniamy dokładność na 30-krotnie większą od ustalonej ze względu na mniejszą złożoność obliczeniową
model.Title = "Wykres: "; // tytuł modelu to wykres
LineSeries series1 = new LineSeries(); // zmienna lineseries używana do rysowania wykresów
List <double[]> xy = new List <double[]>(); // lista tablic tak jak w poprzednim przypadku - tutaj przechowuje tylko jeden argument, ale zachowanie konwencji ułatwiło dalsze zadania
foreach (var arg in arguments)
{
xy.Add(ArrayBuilder.CreateVector(arg.Minimum, arg.Maximum, p));
}
// Tak samo jak powyżej
var infunc = new string[p];
for (int i = 0; i < p; ++i)
{
infunc[i] = xy[0][i].ToString().Replace(',', '.');
}
// Tak samo jak powyżej
var data = new double[p];
for (int i = 0; i < p; ++i)
{
int progressPercentage = Convert.ToInt32(((double)i / p) * 100);
org.mariuszgromada.math.mxparser.Expression equa = new org.mariuszgromada.math.mxparser.Expression("f(" + infunc[i] + ")", f);
data[i] = equa.calculate();
(sender as BackgroundWorker).ReportProgress(progressPercentage);
}
// Lista wygenerowanych punktów dodawana do zmiennej typu lineseries w celu wygenerowania wykresu
List <DataPoint> pnts = new List <DataPoint>();
for (int i = 0; i < p; ++i)
{
series1.Points.Add(new DataPoint(xy[0][i], data[i]));
}
// Kolor wykresu ustalamy na czerwony - tak żeby wykresy i warstwice były tego samego koloru
series1.Color = OxyColors.Red;
model.Series.Add(series1);
p = p / 30; // przywracamy domyślną wartość zmiennej odpowiadającej za dokładność wykresu
}
// Czyścimy listę argumentów w postaci łańcuchów znaków
argumentsString.Clear();
// Czyścimy wyrażenie
eq = new org.mariuszgromada.math.mxparser.Expression();
// Zapisujemy utworzony model w wyniku wątku rysowania
e.Result = model;
}
private double Integral(Expression exp, double n)
{
exp.setArgumentValue("n", n);
return(exp.calculate());
}
/**
* Forward difference operator
*
* @param pos the token position
*/
private void FORWARD_DIFFERENCE(int pos)
{
List<FunctionParameter> parameters = getFunctionParameters(pos, tokensList);
FunctionParameter funParam = parameters[0];
FunctionParameter xParam = parameters[1];
ArgumentParameter x = getParamArgument(xParam.paramStr);
Expression funExp = new Expression(funParam.paramStr, funParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
if (verboseMode == true)
funExp.setVerboseMode();
double h = 1;
if (parameters.Count == 3) {
FunctionParameter hParam = parameters[2];
Expression hExp = new Expression(hParam.paramStr, hParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
if (verboseMode == true)
hExp.setVerboseMode();
h = hExp.calculate();
}
calcSetDecreaseRemove(pos, Calculus.forwardDifference(funExp, h, x.argument) );
clearParamArgument(x);
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
var stopWatch = System.Diagnostics.Stopwatch.StartNew();
int questionNum = Convert.ToInt32(questionNumber.Value);
if (backgroundWorker1.CancellationPending)
{
e.Cancel = true;
backgroundWorker1.ReportProgress(0);
return;
}
else
{
while (!backgroundWorker1.CancellationPending && !workIsCompleted)
{
Debug.WriteLine("Checking if backgroundWorker Cancelled");
for (int i = 0; i <= questionNumber.Value; i++)
{
Debug.WriteLine("This Line has been executed on For Loop.");
decimals = true;
while (decimals == true)
{
Random questionTypeGen = new Random();
string questionRandResult = questionGenerator(Convert.ToInt32(((quizForm)f).iterationValue.Text) - 1, Convert.ToInt32(((quizForm)f).firstNum1.Value), Convert.ToInt32(((quizForm)f).firstNum2.Value));
if (formattingOption1.Checked == true)
{
questionString = questionRandResult;
}
else
{
questionString = questionRandResult.Replace("*", " X ");
questionString = questionString.Replace("+", " + ");
questionString = questionString.Replace("-", " - ");
questionString = questionString.Replace("/", " : ");
}
Expression ex = new Expression(questionRandResult);
result = ex.calculate();
Debug.WriteLine("This Line executed after computing");
if (Math.Abs(result % 1) < Double.Epsilon)
{
decimals = false;
sb.Append(questionString + " = " + result.ToString() + Environment.NewLine);
Debug.WriteLine(sb.ToString());
}
else
{
if (((quizForm)f).noDecimalCheckbox.Checked == false)
{
decimals = false;
double resultNew = Math.Round(result, Convert.ToInt32(((quizForm)f).decimalNumbers.Text), MidpointRounding.AwayFromZero);
sb.Append(questionString + " = " + resultNew.ToString() + Environment.NewLine);
}
else
{
decimals = true;
retryCount++;
}
}
}
if (backgroundWorker1.CancellationPending)
{
backgroundWorker1.ReportProgress(0);
break;
}
if (i == questionNum)
{
Debug.WriteLine("Completed!");
workIsCompleted = true;
}
backgroundWorker1.ReportProgress(i);
}
}
}
stopWatch.Stop();
}
/**
* IFF function
*
* @param pos the token position
*/
private void IFF(int pos)
{
/*
* Get condition string
* 1st parameter
*/
List<FunctionParameter> iffParams = getFunctionParameters(pos, tokensList);
FunctionParameter iffParam = iffParams[0];
int parametersNumber = iffParams.Count;
int trueParamNumber;
int paramNumber;
paramNumber = 1;
Expression iffExp;
double iffValue = 0;
bool iffCon = true;
do {
iffExp = new Expression(iffParam.paramStr, iffParam.tokens, argumentsList, functionsList, constantsList, KEEP_ULP_ROUNDING_SETTINGS);
if (verboseMode == true)
iffExp.setVerboseMode();
iffCon = true;
iffValue = iffExp.calculate();
if ( (iffValue == 0) || (Double.IsNaN(iffValue)) ) {
paramNumber += 2;
iffCon = false;
if (paramNumber < parametersNumber)
iffParam = iffParams[paramNumber-1];
}
} while ( (!iffCon) && (paramNumber < parametersNumber) );
int from;
int to;
int p;
if (iffCon) {
trueParamNumber = paramNumber+1;
from = pos+1;
to = iffParams[parametersNumber-1].toIndex+1;
tokensList[from].tokenLevel--;
tokensList[to].tokenLevel--;
if (trueParamNumber < parametersNumber) {
to = iffParams[parametersNumber-1].toIndex;
from = iffParams[trueParamNumber].fromIndex-1;
for (p = to; p >= from; p--)
tokensList.RemoveAt(p);
}
from = iffParams[trueParamNumber-1].fromIndex;
to = iffParams[trueParamNumber-1].toIndex;
for (p = from; p <= to; p++)
tokensList[p].tokenLevel--;
to = from-1;
from = pos;
for (p = to; p >= from; p--)
if (p != pos + 1)
tokensList.RemoveAt(p);
} else {
to = iffParams[parametersNumber-1].toIndex+1;
from = pos+1;
for (p = to; p >= from; p--)
tokensList.RemoveAt(p);
setToNumber(pos, Double.NaN);
tokensList[pos].tokenLevel--;
}
}
private void calc(string input)
{
if (CurrentValue == "NaN")
{
CurrentValue = "";
}
Regex isNumber = new Regex(@"^\d$");
if (isNumber.IsMatch(input))
{
CurrentValue += input;
CurrentValue = format(CurrentValue);
}
else if (input == "🗑")
{
Historique.Clear();
}
else if (input == "C")
{
CalcString = "";
CurrentValue = "";
}
else if (input == "CE")
{
CurrentValue = "";
}
else if (input == "=")
{
if (CalcString.Length > 0)
{
if (CurrentValue.Length == 0 && CalcString.Substring(CalcString.Length - 1) != "!" && CalcString.Substring(CalcString.Length - 1) != ")")
{
CalcString = CalcString.Substring(0, CalcString.Length - 1);
}
CalcString += CurrentValue;
if (CalcString.Count(x => x == '(') > CalcString.Count(x => x == ')'))
{
int numberOfOpen = CalcString.Count(x => x == '(');
int numberOfClose = CalcString.Count(x => x == ')');
int rest = numberOfOpen - numberOfClose;
for (int i = 0; i < rest; i++)
{
CalcString += ')';
}
}
CalcString = CalcString.Replace(",", ".");
org.mariuszgromada.math.mxparser.Expression expression = new org.mariuszgromada.math.mxparser.Expression(new string(CalcString.ToCharArray().Where(c => !Char.IsWhiteSpace(c)).ToArray()));
double result = expression.calculate();
CurrentValue = format(result.ToString());
Historique.Add(new Calcul(CalcString, format(result.ToString())));
CalcString = "";
}
}
else if (input == ",")
{
if (CurrentValue.IndexOf(',') == -1 && CurrentValue.Length != 0)
{
CurrentValue += input;
}
}
else if (input == "(")
{
CalcString += input;
}
else if (input == ")")
{
CalcString += CurrentValue + ")";
CurrentValue = "";
}
else
{
// Supprime la virgule en fin de lignesi un opérateur est choisie
if (CurrentValue.Length > 0 && CurrentValue.Substring(CurrentValue.Length - 1) == ",")
{
CurrentValue = CurrentValue.Substring(0, CurrentValue.Length - 1);
}
// Ajoute un opérateur s'il y a déjà une valeur enregistré
if (CurrentValue != "" || (CalcString.Length > 0 && CalcString.Substring(CalcString.Length - 1) == "!") || (CalcString.Length > 0 && CalcString.Substring(CalcString.Length - 1) == ")"))
{
CalcString += CurrentValue + input;
CurrentValue = "";
}
else if (CalcString.Length > 0)
{
CalcString = CalcString.Substring(0, CalcString.Length - 1) + input;
}
if (input == "-" && CalcString.Length == 0)
{
CalcString = "0-";
}
}
}
/**
* Function integral
*
* @param pos the token position
*/
private void INTEGRAL(int pos)
{
/**
* Default epsilon
*/
const double DEF_EPS = 1E-6
;
/*
* Default max number of steps
*/
const int DEF_MAX_STEPS = 20;
List<FunctionParameter> intParams = getFunctionParameters(pos, tokensList);
/*
* Get internal function strinng
* 1th - parameter
*/
FunctionParameter funParam = intParams[0];
/*
* Get argument
* 2nd - parameter
*/
FunctionParameter xParam = intParams[1];
/*
* Get <a,b>
* 2nd - parameter
*/
FunctionParameter aParam = intParams[2];
FunctionParameter bParam = intParams[3];
ArgumentParameter x = getParamArgument(xParam.paramStr);
if (x.presence == Argument.NOT_FOUND) {
updateMissingTokens(xParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(funParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(aParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
updateMissingTokens(bParam.tokens, xParam.paramStr, x.index, Argument.TYPE_ID );
}
Expression funExp = new Expression(funParam.paramStr, funParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
Expression aExp = new Expression(aParam.paramStr, aParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
Expression bExp = new Expression(bParam.paramStr, bParam.tokens, argumentsList, functionsList, constantsList, DISABLE_ULP_ROUNDING);
double eps = DEF_EPS;
int maxSteps = DEF_MAX_STEPS;
calcSetDecreaseRemove(pos, Calculus.integralTrapezoid(funExp, x.argument, aExp.calculate(), bExp.calculate(), eps, maxSteps) );
clearParamArgument(x);
}
public static void Start()
{
/*
* Tutorial for the mXparser version 1.0
* Mariusz Gromada 2010-01-10
*/
/*
* Simple & complex arithmetic expressions, large math functions collection
* User defined arguments, functions, constants
* Calculus operations (i.e. differentiation, integration)
* Summation and product operations
* User defined recursive functions
* Boolean operators
* and many more...
*
*/
/*
* Start from the license
*/
Expression e = new Expression();
mXparser.consolePrintln(e.getLicense());
mXparser.consolePrintln();
/*
* Using help
*/
mXparser.consolePrintln();
mXparser.consolePrintln(e.getHelp());
/*
* Full line searching
*/
mXparser.consolePrintln();
mXparser.consolePrintln(e.getHelp("sine"));
mXparser.consolePrintln();
mXparser.consolePrintln(e.getHelp("inver"));
/*
* Simple expression
*/
Expression e1 = new Expression("2+1");
mXparser.consolePrintln(e1.getExpressionString() + " = " + e1.calculate());
e1.setExpressionString("2-1");
mXparser.consolePrintln(e1.getExpressionString() + " = " + e1.calculate());
/* operators */
Expression e2 = new Expression("2-(32-4)/(23+(4)/(5))-(2-4)*(4+6-98.2)+4");
mXparser.consolePrintln(e2.getExpressionString() + " = " + e2.calculate());
/* power function */
Expression e3 = new Expression("2^3+2^(-3)+2^3^(-4)");
mXparser.consolePrintln(e3.getExpressionString() + " = " + e3.calculate());
/*
* Relations
*/
Expression e4 = new Expression("2=3");
mXparser.consolePrintln(e4.getExpressionString() + " = " + e4.calculate());
Expression e5 = new Expression("2<3");
mXparser.consolePrintln(e5.getExpressionString() + " = " + e5.calculate());
Expression e6 = new Expression("(2=3) | (2<3)");
mXparser.consolePrintln(e6.getExpressionString() + " = " + e6.calculate());
Expression e7 = new Expression("(2=3) & (2<3)");
mXparser.consolePrintln(e7.getExpressionString() + " = " + e7.calculate());
/* 1 arg functions */
Expression e8 = new Expression("sin(2)-cos(3)");
mXparser.consolePrintln(e8.getExpressionString() + " = " + e8.calculate());
/* 2 args functions */
Expression e9 = new Expression("min(3,4) + max(-2,-1)");
mXparser.consolePrintln(e9.getExpressionString() + " = " + e9.calculate());
/* binomial coefficient */
Expression e10 = new Expression("C(10,5)");
mXparser.consolePrintln(e10.getExpressionString() + " = " + e10.calculate());
/* 3 args functions */
/* conditions */
Expression e11 = new Expression("if(2<3,1,0)");
mXparser.consolePrintln(e11.getExpressionString() + " = " + e11.calculate());
Expression e12 = new Expression("if(3<2,1,0)");
mXparser.consolePrintln(e12.getExpressionString() + " = " + e12.calculate());
Expression e13 = new Expression("if(3<2, 1, if(1=1, 5, 0) )");
mXparser.consolePrintln(e13.getExpressionString() + " = " + e13.calculate());
/*
* Free Arguments
*/
Argument x = new Argument("x", 1);
Argument y = new Argument("y", 2);
Argument z = new Argument("z", 3);
Argument n = new Argument("n", 4);
Expression e14 = new Expression("sin(x+y)-cos(y/z)", x, y, z);
mXparser.consolePrintln(e14.getExpressionString() + " = " + e14.calculate());
Expression e15 = new Expression("if(x>y, x-z, if(y<z, sin(x+y), cos(z)) )", x, y, z);
mXparser.consolePrintln(e15.getExpressionString() + " = " + e15.calculate());
x.setArgumentValue(5);
mXparser.consolePrintln(x.getArgumentName() + " = " + x.getArgumentValue());
/*
* Dependent arguments
*/
y = new Argument("y","2*x+5", x);
mXparser.consolePrintln(y.getArgumentName() + " = " + y.getArgumentValue());
y = new Argument("y","sin(y)-z", y, z);
mXparser.consolePrintln(y.getArgumentName() + " = " + y.getArgumentValue());
/* syntax checking */
y.setArgumentExpressionString("n*sin(y)-z");
mXparser.consolePrintln(y.getArgumentName() + " = ... \n syntax = " + y.checkSyntax() + "\n message = \n" + y.getErrorMessage());
y.addArguments(n);
mXparser.consolePrintln(y.getArgumentName() + " = ... \n syntax = " + y.checkSyntax() + "\n message = \n" + y.getErrorMessage());
mXparser.consolePrintln(y.getArgumentName() + " = " + y.getArgumentValue());
/*
* the same methods could be called
* for the expression syntax checking
*
*/
/*
* Complex expressions
*/
/*
* Summation operator SIGMA
* sum(index, from, to, expr)
* sum(index, from, to, expr, by)
*
*/
Expression e16 = new Expression("sum(i,1,10,i)");
mXparser.consolePrintln(e16.getExpressionString() + " = " + e16.calculate());
Expression e17 = new Expression("sum(i,1,10,i,0.5)");
mXparser.consolePrintln(e17.getExpressionString() + " = " + e17.calculate());
/*
* Product operator SIGMA
* prod(index, from, to, expr)
* prod(index, from, to, expr, by)
*/
/* factorial */
Expression e18 = new Expression("prod(i,1,5,i)");
mXparser.consolePrintln(e18.getExpressionString() + " = " + e18.calculate());
Expression e19 = new Expression("prod(i,1,5,i,0.5)");
mXparser.consolePrintln(e19.getExpressionString() + " = " + e19.calculate());
/* Approximation sin(x) by Taylor series
* ! - factorial
*/
Expression e20 = new Expression("sin(x)-sum(n,0,10,(-1)^n*(x^(2*n+1))/(2*n+1)!)", x);
x.setArgumentValue(1);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e20.getExpressionString() + " = " + e20.calculate());
x.setArgumentValue(5);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e20.getExpressionString() + " = " + e20.calculate());
x.setArgumentValue(10);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e20.getExpressionString() + " = " + e20.calculate());
/*
* calculating pi by integral of
* sqrt(1-x^2) from -1 to 1
* using simple summation operator
*/
Argument d = new Argument("d",0.1);
Expression e21 = new Expression("2*sum(x, -1, 1, d*sqrt(1-x^2), d)", d);
mXparser.consolePrintln("d = " + d.getArgumentValue() + ", " + e21.getExpressionString() + " = " + e21.calculate());
d.setArgumentValue(0.01);
mXparser.consolePrintln("d = " + d.getArgumentValue() + ", " + e21.getExpressionString() + " = " + e21.calculate());
/*
* Derivatives
*
* der( f(x,...), x) - general
* der+( f(x,...), x) - right
* der-( f(x,...), x) - left
*/
/* cos(x) as derivative from sin(x) */
Expression e22 = new Expression("cos(x)-der(sin(x), x)", x);
mXparser.consolePrintln(e22.getExpressionString() + " = " + e22.calculate());
/* left and right derivative from |x| */
x.setArgumentValue(0);
Expression e23 = new Expression("der-(abs(x), x)", x);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e23.getExpressionString() + " = " + e23.calculate());
Expression e24 = new Expression("der+(abs(x), x)", x);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e24.getExpressionString() + " = " + e24.calculate());
/* derivative from sin(x) as Taylor series (approximation) */
x.setArgumentValue(1);
Expression e25 = new Expression("cos(x)-der(sum(n,0,10,(-1)^n*(x^(2*n+1))/(2*n+1)!), x)", x);
x.setArgumentValue(1);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e25.getExpressionString() + " = " + e25.calculate());
x.setArgumentValue(5);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e25.getExpressionString() + " = " + e25.calculate());
x.setArgumentValue(10);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e25.getExpressionString() + " = " + e25.calculate());
/*
* Integral
* int(f(x,...), x, a, b)
*/
/* calculating PI value */
Expression e26 = new Expression("2*int(sqrt(1-x^2), x, -1, 1)");
mXparser.consolePrintln(e26.getExpressionString() + " = " + e26.calculate());
/*
* Parser constants
*/
Expression e27 = new Expression("pi");
mXparser.consolePrintln(e27.getExpressionString() + " = " + e27.calculate());
Expression e28 = new Expression("e");
mXparser.consolePrintln(e28.getExpressionString() + " = " + e28.calculate());
/* and many many more ... */
/*
* USER DEFINED FUNCTIONS
* f(x,y) = sin(x+y)
* f(a,b,c,d,...) = ....
*/
Function f = new Function("f", "x^2", "x");
Expression e29 = new Expression("f(2)");
e29.addFunctions(f);
mXparser.consolePrintln(e29.getExpressionString() + " = " + e29.calculate());
/*
* Please be informed that sequence of
* arguments names is important. In the below exampe
* a - 1st argument of f
* b - 2nd argument of f
* c - 3rd argument of f
*
* In the expressions f will be c alled as f( . , . , . )
*/
f = new Function("f", "a+b+c", "a", "b", "c");
Expression e30 = new Expression("f(1, 2, 3)");
e30.addFunctions(f);
mXparser.consolePrintln(e30.getExpressionString() + " = " + e30.calculate());
/*
* Using functions in functions
*/
f = new Function("f", "x^2", "x");
Function g = new Function("g", "f(x)^2", "x");
g.addFunctions(f);
mXparser.consolePrintln("g(2) = " + g.calculate(2));
Expression e31 = new Expression("f(x)+g(2*x)", x);
e31.addFunctions(f, g);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e31.getExpressionString() + " = " + e31.calculate());
x.setArgumentValue(2);
Expression e32 = new Expression("der(g(x),x)", x);
e32.addFunctions(g);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e32.getExpressionString() + " = " + e32.calculate());
/*
* Fundamental theorem of calculus
* if F(x) = int_a^x f(t) dt
* then F'(x) = f(x)
*/
f = new Function("f", "sin(x)", "x");
Function F = new Function("F", "int(f(t), t, 0, x)", "x");
F.addFunctions(f);
Expression e33 = new Expression("f(x) - der(F(x),x)", x);
e33.addFunctions(f, F);
mXparser.consolePrintln("x = " + x.getArgumentValue() + ", " + e33.getExpressionString() + " = " + e33.calculate() +
", computing time : " + e33.getComputingTime() + " s.");
/*
* Simple (fast) recursion
* Only one index n >= 0, n integer
*/
/* Fibonacci numbers with add base cases method*/
n = new Argument("n");
RecursiveArgument fib1 = new RecursiveArgument("fib1", "fib1(n-1)+fib1(n-2)", n);
fib1.addBaseCase(0, 0);
fib1.addBaseCase(1, 1);
mXparser.consolePrintln("fib1: ");
for (int i = 0; i <= 10; i++ )
mXparser.consolePrint(fib1.getArgumentValue(i) + ", ");
mXparser.consolePrintln();
/* Fibonacci numbers with if statement*/
RecursiveArgument fib2 = new RecursiveArgument("fib2", "if( n>1, fib2(n-1)+fib2(n-2), if(n=1,1,0) )", n);
mXparser.consolePrintln("fib2: ");
for (int i = 0; i <= 10; i++ )
mXparser.consolePrint(fib2.getArgumentValue(i) + ", ");
mXparser.consolePrintln();
Expression e34 = new Expression("sum(i, 0, 10, fib1(i))", fib1);
mXparser.consolePrintln(e34.getExpressionString() + " = " + e34.calculate() +
", computing time : " + e34.getComputingTime() + " s.");
Expression e35 = new Expression("sum(i, 0, 10, fib2(i))", fib2);
mXparser.consolePrintln(e35.getExpressionString() + " = " + e35.calculate() +
", computing time : " + e35.getComputingTime() + " s.");
/*
* Complex recursion (slow)
* any definition
*
*
*/
/* Fibonacci numbers using complex recursion */
Function fib3 = new Function("fib3","if(n>1, fib3(n-1)+fib3(n-2), if(n>0,1,0))", "n");
mXparser.consolePrintln("fib2: ");
for (int i = 0; i <= 10; i++ )
mXparser.consolePrint(fib3.calculate(i) + ", ");
mXparser.consolePrintln();
Expression e36 = new Expression("sum(i, 0, 10, fib3(i))");
e36.addFunctions(fib3);
mXparser.consolePrintln(e36.getExpressionString() + " = " + e36.calculate() +
", computing time : " + e36.getComputingTime() + " s.");
/*
* Chebyshev polynomials definition using
* recursive functions
*/
Function T = new Function("T","if(n>1, 2*x*T(n-1,x)-T(n-2,x), if(n>0, x, 1) )", "n", "x");
Argument k = new Argument("k", 5);
Expression e37 = new Expression("T(k,x) - ( (x + sqrt(x^2-1))^k + (x - sqrt(x^2-1))^k)/2", k, x);
e37.addFunctions(T);
mXparser.consolePrintln(e37.getExpressionString() + " = " + e37.calculate() +
", computing time : " + e37.getComputingTime() + " s.");
/*
* Binomial coefficient using complex recursion
*/
Function Cnk = new Function("Cnk","if( k>0, if( k<n, Cnk(n-1,k-1)+Cnk(n-1,k), 1), 1)","n", "k");
Expression e38 = new Expression("C(10,5) - Cnk(10,5)");
e38.addFunctions(Cnk);
mXparser.consolePrintln(e38.getExpressionString() + " = " + e38.calculate() +
", computing time : " + e38.getComputingTime() + " s.");
/*
* Differences between simple and complex recursion
*
* Simple:
*
* Advantages
* 1) fast
* 2) remembers what was previously calculated
* 3) calculations are done in a controlled way
* - recursion counter (each recursion step increases
* recursion counter, for calculating n-th recursion
* value maximum n recursion steps are needed
* - no negative indexes
* 4) add base value method
*
* Disadvantages
* 1) limited to one index argument (positive integer index argument)
*
* Complex recursion
*
* Advantages
* 1) flexible - no limitations
*
* Disadvantages
* 1) slow
* 2) no add base values method
*/
/*
* User defined constants
*/
Constant a = new Constant("a", 5);
Constant b = new Constant("b", 10);
Constant c = new Constant("c", 15);
Expression e39 = new Expression("a+b+c");
e39.addConstants(a, b, c);
/*
* For example in verbose mode
* computing
*/
e39.setVerboseMode();
e39.checkSyntax();
mXparser.consolePrintln();
mXparser.consolePrintln(e39.getErrorMessage());
mXparser.consolePrintln(e39.getExpressionString() + " = " + e39.calculate() +
", computing time : " + e39.getComputingTime() + " s.");
/*
* There are much more other features in the mXparser API.
* Please refer to the API specifications.
*
* Please be aware that this is the version 1.0 of the parser
* - I am pretty sure you will find some bugs - if so please send me
* more info: [email protected]
*/
}