rand integer values from an array

I have an array that contains some integer.

i.e

A=[1 5 7 9]

I would choose a rand value from this vector. Which could be the best way?

Answer 1

[Wayne King]

You can use randi

 index = randi(length(A(:)),1,1);
 A(index)

for a 1-D vector, you can just do length(A), but length(A(:)) will work with a matrix as well.