Add and use function of some variables

[AleksandrShmalko]

Hello! First of all, thank you for the ExpressionEvaluator, it save a lot of time
I have one problem with adding new function with some variables and use it. I see the ExpressionParser has
public void RegisterFunction(string functionName, Delegate function)
{
functions[functionName] = function;
}

Okey, I want to write function standard deviation , double StDev(double[] array). I`m creating new Delegate,

public class MethodsContainer
{
public double StDev(double[] array)
{
double result = 0;// do some with array;
return result;
}
}

public class DelegateCreator
{
    public Delegate CreateNew()
    {
        MethodsContainer container = new MethodsContainer();
        MethodInfo method = container.GetType().GetMethod("StDev");
        var newDelegate = Delegate.CreateDelegate(typeof(Func<double[], double>), container, method);
        return newDelegate;
    }
}

then register it through RegisterFunction. What i need to do next time? Please, provide example if it`s possible

Have a good day!