# Simple Mathematica question

1. Mar 23, 2015

### joshmccraney

Hi PF!

If I'm trying to plot something in mathematica, say $y=x^2$ and then I want to find out what $y$ is when $x=3$, how would I do this?

Thanks so much!

I should add, the function I'm inputting in is a numerical solution to a non-linear ODE, so it's not as easy as simply inputting $3^2$ in the above example.

2. Mar 24, 2015

### joshmccraney

nevermind, I'm good!

3. Mar 31, 2015

### JorisL

Share your solutions for future reference!

4. Apr 1, 2015

### joshmccraney

Sorry, I actually needed to do something different, but I solved that.