private async Task RefreshPlot(Math.Expression func, double from, double to)
{
_ctx.Points.Clear();
await Task.Run(() =>
{
for (var i = from; i <= to; i++)
{
func.addArguments(new Math.Argument($"x = {i}"));
_ctx.Points.Add(new DataPoint(i, func.calculate()));
func.removeAllArguments();
}
});
FuncPlot.InvalidatePlot();
}
/**
* 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 functionDefinitionString Function definition in the form
* of one String, ie "f(x,y) = sin(x) + cos(x)"
* @param elements Optional elements list (variadic - comma separated)
* of types: Argument, Constant, Function
*
* @see PrimitiveElement
*
*/
public Function(String functionDefinitionString, params PrimitiveElement[] elements)
: base(Function.TYPE_ID)
{
parametersNumber = 0;
if (mXparser.regexMatch(functionDefinitionString, ParserSymbol.functionDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(functionDefinitionString);
this.functionName = headEqBody.headTokens[0].tokenStr;
functionExpression = new Expression(headEqBody.bodyStr, elements);
functionExpression.setDescription(headEqBody.headStr);
if (headEqBody.headTokens.Count > 1)
{
Token t;
for (int i = 1; i < headEqBody.headTokens.Count; i++)
{
t = headEqBody.headTokens[i];
if (t.tokenTypeId != ParserSymbol.TYPE_ID)
functionExpression.addArguments(new Argument(t.tokenStr));
}
}
parametersNumber = functionExpression.getArgumentsNumber() - countRecursiveArguments();
description = "";
addFunctions(this);
}
else {
functionExpression = new Expression();
functionExpression.setDescription(functionDefinitionString);
String errorMessage = ""; errorMessage = errorMessage + "\n [" + functionDefinitionString + "] " + "--> pattern not mathes: f(x1,...,xn) = ... reg exp: " + ParserSymbol.functionDefStrRegExp;
functionExpression.setSyntaxStatus(Expression.SYNTAX_ERROR_OR_STATUS_UNKNOWN, errorMessage);
}
}
/**
* Constructor - creates function from function name,
* function expression string and argument names.
*
* @param functionName the function name
* @param functionExpressionString the function expression string
* @param argumentsNames the arguments names (variadic parameters)
* comma separated list
*
* @see Expression
*/
public Function(String functionName
,String functionExpressionString
,params String[] argumentsNames)
: base(Function.TYPE_ID)
{
if (mXparser.regexMatch(functionName, ParserSymbol.nameOnlyTokenRegExp)) {
this.functionName = functionName;
functionExpression = new Expression(functionExpressionString);
functionExpression.setDescription(functionName);
foreach (String argName in argumentsNames)
functionExpression.addArguments(new Argument(argName));
parametersNumber = argumentsNames.Length - countRecursiveArguments();
description = "";
addFunctions(this);
}
else {
parametersNumber = 0;
description = "";
functionExpression = new Expression("");
functionExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + functionName + "]" + "Invalid function name, pattern not matches: " + ParserSymbol.nameTokenRegExp);
}
}
