Generating a new matrix

Let A be a matrix A = rand(4) For all values of A >=0.5, A = 1 else A = 0

now I want to generate a new matrix Alpha..... for which all values of A which are 1 they should have value 0 in Alpha matrix and for all zero values of matrix A the Alpha should have value "pi"

Let A = [1,0;0,0] Alpha should be [0,pi;pi,pi]

Thanks for helpers....... hope i made you understand what i want.... Regards

Answer 1

[Andrei Bobrov]

A = rand(4) >= .5;
Alpha = ~A * pi;

Answer 2

[KSSV]

A = [1,0;0,0] ;
 iwant = A ;
 iwant(A==1) = 0 ;
 iwant(A==0) = pi ;

A = rand(4) ;
 iwant = A ;
  iwant(A>=0.5) = 1 ;
  iwant(A<0.5) = 0 ;