You need to stop posting many questions on the exact same subject, take a deep breath, and figure out exactly what you are trying to do. We cannot read your mind. What does it mean to "catch the values of y at different x values"?? You have x and y, so if you want to look at them instead of plot them, do this:
If that isn't what you want, clarify with very descriptive words!
Perhaps you mean that you want a function which will return the y for a given x?
f = @(X) interp1(x,y,X,'nearest');