function [binary_array_e1 , binary_array_e2 ] = croiser(binary_array_p1,binary_array_p2,alpha )

binary_array_e1=[];
binary_array_e2=[];
compt=1;

if (rand <= alpha)
% some stuff that will put sth in binary_array_e1 and binary_array_e2
end

[binary_array_e1 , binary_array_e2]=croiser(binary_array_p1,binary_array_p2,alpha);