The class evaluates expressions writen in reverse postfix polish notation.

The list of supported functuins is:

• Arithmetic functions: +, -, *, /;
• sin – sine;
• cos – cosine;
• ln – natural logarithm;
• exp – exponent;
• sqrt – square root.

Arguments for these functions could be as usual constants, written as numbers, as variables, writen as $<var_number> ($2, for example). The variable number is zero based index of variables array.

Sample usage:

CopyC#

// expression written in polish notation
string expression = "2 $0 / 3 $1 * +";
// variables for the expression
double[] vars = new double[] { 3, 4 };
// expression evaluation
double result = PolishExpression.Evaluate( expression, vars );