How to change a string to a function name

[Aqua_coder]

soo recently I was making a math plotter, and I managed to make functions like the parabola, the sine function and something like that. But I don't know how to change the string into a desiarable function type,

For example If I want a function of x^2 and enter a string through the function parameter, How do I interpret it through the vertex array?

[eXpl0it3r]

You'll need to write a parser of some sort.
Depending on the complexity and desired notation, you could give the Shunting-yard algorithm a try

[Aqua_coder]

Definitely will give it a try, Thanks for the reply