public CustomFunction(string name, FunctionDelegate4 function)
{
_name = name;
_calculate4 = function;
_argumentCount = 4;
}
public void AddCustomFunction(string name, FunctionDelegate4 function)
{
string lowername = name.ToLower();
if (m_Functions.ContainsKey(lowername))
throw new FunctionAlreadyDefinedException("Function " + name + " already defined!");
m_Functions[lowername] = new CustomFunction(lowername, function);
}