How Can i Produce a Random mxn Matrix, with pre -specified set of integers?!

Hi :P I need to generate a random mxn matrix with elements either -1 or 1 only.

Answer 1

[Wayne King]

   X = randi([0 1],20,20);
   X(X==0) = -1;

[Ehab]

Pro :D Thanks very much!! :*