//Gets symbolic representation of formula
public String getText()
{
if (this.text != null)
{
return(text);
}
String[] reverseVarNames = new String[varNames.Count];
foreach (String vn in varNames.Keys)
{
reverseVarNames[varNames[vn]] = vn;
}
SymbolicExpression[] stack = new SymbolicExpression[rpnFormula.Length];
int sPtr = -1;
int vPtr = 0;
for (int i = 0; i < rpnFormula.Length; i++)
{
byte v = rpnFormula[i];
if (v == 0)
{
stack[++sPtr] = new SymbolicExpression(rpnKoef[vPtr++]);
}
else if (v <= 5)
{
if (v == 1)
{
stack[sPtr - 1] = new SymbolicExpression("+", stack[sPtr - 1], stack[sPtr]);
}
else if (v == 2)
{
stack[sPtr - 1] = new SymbolicExpression("-", stack[sPtr - 1], stack[sPtr]);
}
else if (v == 3)
{
stack[sPtr - 1] = new SymbolicExpression("*", stack[sPtr - 1], stack[sPtr]);
}
else if (v == 4)
{
stack[sPtr - 1] = new SymbolicExpression("/", stack[sPtr - 1], stack[sPtr]);
}
else if (v == 5)
{
stack[sPtr - 1] = new SymbolicExpression("^", stack[sPtr - 1], stack[sPtr]);
}
sPtr--;
}
else if (v <= 10)
{
if (v == 6)
{
stack[sPtr] = new SymbolicExpression("lg", stack[sPtr]);
}
else if (v == 7)
{
stack[sPtr] = new SymbolicExpression("exp", stack[sPtr]);
}
else if (v == 8)
{
stack[sPtr] = new SymbolicExpression("sin", stack[sPtr]);
}
else if (v == 9)
{
stack[sPtr] = new SymbolicExpression("cos", stack[sPtr]);
}
else if (v == 10)
{
stack[sPtr] = new SymbolicExpression("tg", stack[sPtr]);
}
}
else if (v <= 19)
{
if (v == 11)
{
stack[sPtr] = new SymbolicExpression("ctg", stack[sPtr]);
}
else if (v == 12)
{
stack[sPtr] = new SymbolicExpression("asin", stack[sPtr]);
}
else if (v == 13)
{
stack[sPtr] = new SymbolicExpression("acos", stack[sPtr]);
}
else if (v == 14)
{
stack[sPtr] = new SymbolicExpression("atan", stack[sPtr]);
}
else if (v == 15)
{
stack[sPtr] = new SymbolicExpression("acot", stack[sPtr]);
}
else if (v == 16)
{
stack[sPtr] = new SymbolicExpression("sh", stack[sPtr]);
}
else if (v == 17)
{
stack[sPtr] = new SymbolicExpression("ch", stack[sPtr]);
}
else if (v == 18)
{
stack[sPtr] = new SymbolicExpression("th", stack[sPtr]);
}
else if (v == 19)
{
stack[sPtr] = new SymbolicExpression("cth", stack[sPtr]);
}
}
else if (v <= 25)
{
if (v == 20)
{
stack[sPtr] = new SymbolicExpression("abs", stack[sPtr]);
}
if (v == 21)
{
stack[sPtr] = new SymbolicExpression("Re", stack[sPtr]);
}
if (v == 22)
{
stack[sPtr] = new SymbolicExpression("Im", stack[sPtr]);
}
if (v == 23)
{
stack[sPtr] = new SymbolicExpression("arg", stack[sPtr]);
}
if (v == 24)
{
stack[sPtr] = new SymbolicExpression("sqrt", stack[sPtr]);
}
if (v == 25)
{
stack[sPtr] = new SymbolicExpression("-", stack[sPtr]);
}
}
else if (v <= 63)
{
//RESERVED
}
else if (v <= 127)
{
stack[++sPtr] = new SymbolicExpression(reverseVarNames[v - 64]);
}
else
{
throw new IndexOutOfRangeException("Invalid symbol code");
}
}
this.text = stack[0].toString();
return(this.text);
}