Caching result of pre-computed function in Matlab

Question

I have two arrays, x and y. x is the input of the function and y is the function values. For example, x = [ 1 2 3 4

Answer 1

I think that you just want:

y(z);  

This will return the z'th elements of the y vector. You may want

y(x(z));

Which will return the same result in your example, since x is just the value 1 through 10.

With both of these z can contain only positive integers, and in the second case x must also contain only positive integers.