Here you can find a WPF app with a
click once deployment.
I use Roslyn script engine to turn C# code into function that is being graphed on a canvas.
This is how a common output looks:
For example you can write something like:
OR something more complex like:
var flatness = 2;
var period = x * PI;
(1 + flatness * flatness)
(1 + flatness * flatness * cos(period)*cos(period))
) * cos(period)
The code must be valid C#.
Here you can see a list of functions you can use,
plus anything from the Math object of .NET framework.
And here is a list of functions that I often use when writing games:
You can also use bezier editor to compose complex functions
Find the source code on GIT Hub.