private void btnEvalAt_Click(object sender, EventArgs e)
{
double fx;
string s = InputBoxForm.GetStrInput("Eval at x=", "1.5");
if (s == null || s == "")
{
return;
}
if (!double.TryParse(s.Replace(" ", ""), out fx))
{
MessageBox.Show("Couldn't parse number."); return;
}
StringBuilder sbCode = new StringBuilder();
sbCode.AppendLine(this.txtInit.Text);
sbCode.AppendLine("double x=" + fx.ToString(CultureInfo.InvariantCulture) + ";");
sbCode.AppendLine("double y;");
sbCode.AppendLine(getUserExpression(this.txtEq1.Text)); //translate one line into code
sbCode.AppendLine("ans = y;");
string strError;
CodedomEvaluator.CodedomEvaluator cb = new CodedomEvaluator.CodedomEvaluator();
double fOut = cb.mathEval(sbCode.ToString(), new Dictionary <string, double>(), out strError);
if (strError != "")
{
MessageBox.Show(strError); return;
}
MessageBox.Show("y= " + fOut.ToString());
}
//turn into form y = x
protected string getUserExpression(string s)
{
//transform sin into Math.sin
CodedomEvaluator.CodedomEvaluator cb = new CodedomEvaluator.CodedomEvaluator();
s = cb.addMathMethods(s);
//if blank, assume 0
if (s=="" || s.Trim()=="")
return "y=0.0;";
// one line of expression, for example
if (!s.Trim().Contains("\r\n") && !s.Trim().Contains(";"))
return "y = " + s.Trim() + ";";
return s;
}
//note to use CultureInfo.InvariantCulture when turning doubles to strings
//assumes variable is "x"
//place result into "val"
public static double[] codedomLoopExpression(string strAdditionalExp, string strLoopExp, double xstart, double xinc, int nIters, out string strError)
{
StringBuilder sb = new StringBuilder();
sb.AppendLine(strAdditionalExp);
sb.AppendLine("double val;");
sb.AppendLine("double x = "+xstart.ToString(CultureInfo.InvariantCulture)+";");
sb.AppendLine( "for (int iii=0; iii<"+nIters.ToString()+"; iii++) {");
sb.AppendLine(strLoopExp);
sb.AppendLine( "arrAns[iii]=val;");
sb.AppendLine( "x+= "+xinc.ToString(CultureInfo.InvariantCulture)+"; }");
CodedomEvaluator cd = new CodedomEvaluator();
return cd.mathEvalArray(sb.ToString(), new Dictionary<string, double>(), nIters, out strError);
}
//note to use CultureInfo.InvariantCulture when turning doubles to strings
//assumes variable is "x"
//place result into "val"
public static double[] codedomLoopExpression(string strAdditionalExp, string strLoopExp, double xstart, double xinc, int nIters, out string strError)
{
StringBuilder sb = new StringBuilder();
sb.AppendLine(strAdditionalExp);
sb.AppendLine("double val;");
sb.AppendLine("double x = " + xstart.ToString(CultureInfo.InvariantCulture) + ";");
sb.AppendLine("for (int iii=0; iii<" + nIters.ToString() + "; iii++) {");
sb.AppendLine(strLoopExp);
sb.AppendLine("arrAns[iii]=val;");
sb.AppendLine("x+= " + xinc.ToString(CultureInfo.InvariantCulture) + "; }");
CodedomEvaluator cd = new CodedomEvaluator();
return(cd.mathEvalArray(sb.ToString(), new Dictionary <string, double>(), nIters, out strError));
}
//turn into form y = x
protected string getUserExpression(string s)
{
//transform sin into Math.sin
CodedomEvaluator.CodedomEvaluator cb = new CodedomEvaluator.CodedomEvaluator();
s = cb.addMathMethods(s);
//if blank, assume 0
if (s == "" || s.Trim() == "")
{
return("y=0.0;");
}
// one line of expression, for example
if (!s.Trim().Contains("\r\n") && !s.Trim().Contains(";"))
{
return("y = " + s.Trim() + ";");
}
return(s);
}
private void btnEvalAt_Click(object sender, EventArgs e)
{
double fx;
string s = InputBoxForm.GetStrInput("Eval at x=", "1.5");
if (s==null || s=="") return;
if (!double.TryParse(s.Replace(" ", ""), out fx))
{ MessageBox.Show("Couldn't parse number."); return; }
StringBuilder sbCode = new StringBuilder();
sbCode.AppendLine(this.txtInit.Text);
sbCode.AppendLine("double x="+fx.ToString(CultureInfo.InvariantCulture)+";");
sbCode.AppendLine("double y;");
sbCode.AppendLine(getUserExpression(this.txtEq1.Text)); //translate one line into code
sbCode.AppendLine("ans = y;");
string strError;
CodedomEvaluator.CodedomEvaluator cb = new CodedomEvaluator.CodedomEvaluator();
double fOut = cb.mathEval(sbCode.ToString(), new Dictionary<string, double>(), out strError);
if (strError != "") { MessageBox.Show(strError); return; }
MessageBox.Show("y= "+fOut.ToString());
}
public static string Test()
{
CodedomEvaluator cd = new CodedomEvaluator();
string strErr, strExp; double result; Dictionary <string, double> d;
strExp = "1+1";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.0));
strExp = "1+1;";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.0));
strExp = "2.6*1.1 + (7-3*2.4)";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.66));
strExp = "x*x+4.0";
result = cd.simpleMathEval(strExp, "x", 2.0, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 8.0));
strExp = "x*y + 1.0";
d = new Dictionary <string, double>();
d["x"] = 2.0; d["y"] = 3.0;
result = cd.simpleMathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 7.0));
strExp = "double z; z=2.0; ans = x*y + z;";
d = new Dictionary <string, double>();
d["x"] = 2.0; d["y"] = 3.0;
result = cd.mathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 8.0));
strExp = "arrAns[0]=x;arrAns[1]=x*2;arrAns[2]=x*3;";
d = new Dictionary <string, double>();
d["x"] = 15;
double[] resultArr = cd.mathEvalArray(strExp, d, 3, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(resultArr[0], 15.0));
Debug.Assert(doubleEqual(resultArr[1], 30.0));
Debug.Assert(doubleEqual(resultArr[2], 45.0));
strExp = "for(int i=0;i<40;i++) arrAns[i]=i*i;";
d = new Dictionary <string, double>();
resultArr = cd.mathEvalArray(strExp, d, 40, out strErr);
Debug.Assert(strErr == "");
for (int i = 0; i < 40; i++)
{
Debug.Assert(doubleEqual(resultArr[i], i * i));
}
strExp = "FN1 inf=delegate(double a) { return a*a; }; ans = inf(4.0);";
d = new Dictionary <string, double>();
result = cd.mathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 16.0));
strExp = "FN2 inf=delegate(double a,double b) { return a/(b+1); }; for(int i=0;i<40;i++) arrAns[i]=inf(i,i);";
d = new Dictionary <string, double>();
resultArr = cd.mathEvalArray(strExp, d, 40, out strErr);
Debug.Assert(strErr == "");
for (int i = 0; i < 40; i++)
{
Debug.Assert(doubleEqual(resultArr[i], i / ((double)i + 1)));
}
string strLoopExp = "val = x*x*x;";
resultArr = CodedomLoopExpression.codedomLoopExpression("", strLoopExp, 1.0, 0.1, 50, out strErr);
Debug.Assert(strErr == "");
double x = 1.0;
for (int i = 0; i < 50; i++)
{
Debug.Assert(doubleEqual(resultArr[i], x * x * x));
x += 0.1;
}
//create an overflow. We expect exception to be caught earlier, and that strErr records result.
try
{
strExp = "arrAns[40]=30.1;";
d = new Dictionary <string, double>();
resultArr = cd.mathEvalArray(strExp, d, 1, out strErr);
}
catch (Exception)
{
Debug.Assert(false); //an exception occurred.
}
Debug.Assert(strErr != "");
Debug.Assert(cd.addMathMethods("4*sin(.4)+Sin(acos(.9))") == "4*Math.Sin(.4)+Math.Sin(Math.Acos(.9))");
Debug.Assert(cd.addMathMethods("4*othersin(.4) + ocoso(.6)") == "4*othersin(.4) + ocoso(.6)");
return("");
}
public static string Test()
{
CodedomEvaluator cd = new CodedomEvaluator();
string strErr, strExp; double result; Dictionary<string, double> d;
strExp = "1+1";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.0));
strExp = "1+1;";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.0));
strExp = "2.6*1.1 + (7-3*2.4)";
result = cd.simpleMathEval(strExp, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 2.66));
strExp = "x*x+4.0";
result = cd.simpleMathEval(strExp, "x", 2.0, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 8.0));
strExp = "x*y + 1.0";
d = new Dictionary<string,double>();
d["x"] = 2.0; d["y"] = 3.0;
result = cd.simpleMathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 7.0));
strExp = "double z; z=2.0; ans = x*y + z;";
d = new Dictionary<string, double>();
d["x"] = 2.0; d["y"] = 3.0;
result = cd.mathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 8.0));
strExp = "arrAns[0]=x;arrAns[1]=x*2;arrAns[2]=x*3;";
d = new Dictionary<string, double>();
d["x"] = 15;
double[] resultArr = cd.mathEvalArray(strExp, d,3, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(resultArr[0], 15.0));
Debug.Assert(doubleEqual(resultArr[1], 30.0));
Debug.Assert(doubleEqual(resultArr[2], 45.0));
strExp = "for(int i=0;i<40;i++) arrAns[i]=i*i;";
d = new Dictionary<string, double>();
resultArr = cd.mathEvalArray(strExp, d, 40, out strErr);
Debug.Assert(strErr == "");
for (int i=0;i<40;i++)
Debug.Assert(doubleEqual(resultArr[i], i*i));
strExp = "FN1 inf=delegate(double a) { return a*a; }; ans = inf(4.0);";
d = new Dictionary<string, double>();
result = cd.mathEval(strExp, d, out strErr);
Debug.Assert(strErr == "");
Debug.Assert(doubleEqual(result, 16.0));
strExp = "FN2 inf=delegate(double a,double b) { return a/(b+1); }; for(int i=0;i<40;i++) arrAns[i]=inf(i,i);";
d = new Dictionary<string, double>();
resultArr = cd.mathEvalArray(strExp, d, 40, out strErr);
Debug.Assert(strErr == "");
for (int i=0; i<40; i++)
Debug.Assert(doubleEqual(resultArr[i], i/((double)i+1)));
string strLoopExp = "val = x*x*x;";
resultArr=CodedomLoopExpression.codedomLoopExpression("", strLoopExp, 1.0, 0.1, 50, out strErr);
Debug.Assert(strErr == "");
double x=1.0;
for (int i=0; i<50; i++)
{
Debug.Assert(doubleEqual(resultArr[i], x*x*x));
x+=0.1;
}
//create an overflow. We expect exception to be caught earlier, and that strErr records result.
try
{
strExp = "arrAns[40]=30.1;";
d = new Dictionary<string, double>();
resultArr = cd.mathEvalArray(strExp, d, 1, out strErr);
}
catch (Exception )
{
Debug.Assert(false); //an exception occurred.
}
Debug.Assert(strErr != "");
Debug.Assert(cd.addMathMethods("4*sin(.4)+Sin(acos(.9))")=="4*Math.Sin(.4)+Math.Sin(Math.Acos(.9))");
Debug.Assert(cd.addMathMethods("4*othersin(.4) + ocoso(.6)")=="4*othersin(.4) + ocoso(.6)");
return "";
}