//f(x) = c*x^y => f'(x) = c*y*x^y-1 c,y - constant
private static Expression GetDerivativeOfParametr(Expression function)
{
if (function is ParameterExpression)
{
return(Expression.Constant(1d));
}
var functionFeatures = FunctionFeatures.GetFeatures(function as BinaryExpression);
return(Expression.Multiply(
Expression.Constant(functionFeatures.Constant * functionFeatures.Pow),
Expression.Call(null,
typeof(Math).GetMethod("Pow"),
x,
Expression.Constant((functionFeatures.Pow - 1)))));
}
