How to delete zero components in a vector in Matlab?

Question

I have a vector for example

a = [0 1 0 3]

I want to turn a into b which equals b = [1 3].

How do I perform this in gen

Answer 1

You could use sparse(a), which would return

(1,2) 1

(1,4) 3

This allows you to keep the information about where your non-zero entries used to be.