TMtxExpression.DefineFunction Method

Int32 DefineFunction(String AFunctName, TExprFunc AFuncAddress, Int32 NArguments, Int32 NResults, String Help)

Defines new function.

#	Name	Description
1	AFunctName	Defines function name. If a function with the same name was already definded, it is redefined and all expressions which contain the symbol AFuncName will be recompiled before the next evaluation.
2	AFuncAddress
3	NArguments	Defines number of arguments for function.
4	NResults	Defines number of arguments, which are treated as results. NResults <= NArguments
5	Help	Function help text.

Returns: Int32

Examples

using Dew.Math;
using Dew.Math.Units;

namespace Dew.Examples
{
    void Example()
    {
        void _Factorial_D (TExprRec Param)
        {
            Param.Res.DefineDouble;
            Param.Res.DoubleValue = Fact(System.Math.Round(Param.Args[0].DoubleValue));
        }

        void Example(TMtxExpression MyParser)
        {
            myParser.DefineFunction("fact_double", _Factorial_D, 1, "fact_double(x): factorial function");
        }
    }
}