An expression for choosing a value from the array automatically

Hi,

I have an array of values and I need to frame an expression such that it chooses the value from the array automatically instead of me assigning a value from the array everytime. For example, if

A=[1 2 3 4]

B=[5 6 7 8]

while initialising A, B for the first time I choose A=2, and B=6 (A and B are selected with corresponding element) and next time A=4, B=8

Could someone please give some suggestions.

Answer 1

[Yohai]

The function

choose=@(arr) arr(ceil(rand*length(arr)))

chooses a random element of a vector. For example

choose([1 2 pi 8 i])
 3.1416

[Priya]

Thanks for your reply. Could you please replace with A and B in the equation you have mentioned. I don't get it completely.

[Priya]

Thanks very much. It worked!