MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn moreOpportunities for recent engineering grads.

Apply Today**New to MATLAB?**

Asked by KH
on 4 Dec 2012

I have a graph which is ascending in the beginning and will descend afterwards.

Let's say my y-axis is Y, and x-axis is X,

for a certain Y value, it will give two values on the x-axis.

say in this case i set Y to a value of 20, but it only gives me one X value, which is the latter value when the graph is in its descending portion. How do I get the X value for the initial ascending part of the graph?

I did something like this: interp1(Y,X,20)

Kindly advice.. Thanks!

*No products are associated with this question.*

Answer by John Petersen
on 4 Dec 2012

Use the same index for each parameter. If you want to know the values of X for a given value of Y,

yind = (Y==yvalue); xvalues = X(yind); % values of x that correspond to yvalue

## 0 Comments