Generate a rondom sequence

Greetings,

Please can any one help me about:

How to Generate Generate a random sequence Z ={(i, j)},

where i, j Belongs to {1, 2, 3, 4}, i not equal to j

 i and j are selected randomly.

Best Regards

Answer 1

[Youssef Khmou]

or you can try :

 a=1:4;
 v=perms(a); % ALL possible combinations 
 Z=[v(:,1:2);v(:,3:4)];% Z is 2 columns

[Cedric]

+1

[abdulhakeem]

Dear Youssef KHMOU,

Thank you very much that is exactly I want. I appreciate That.

Best Regards

Answer 2

[Youssef Khmou]

hi,

Random sequence derived from which distribution ?

 Z=rand(4); % from Uniform distribution.
 Z=randn(4); % from Normal distribution.
 Z=random('rayl',(1:4)'*(1:4)) % from Rayleigh distribution

Answer 3

[Cedric]

A basic approach, but dangerous as you don't know how much time it will take, could be..

 ii = randi(4, 4, 1) ;
 jj = randi(4, 4, 1) ;
 while any(jj == ii)
    jj = randi(4, 4, 1) ;
 end
 Z = [ii, jj]

If you don't want repetitions within ii or jj, you can use RANDPERM.

[abdulhakeem]

Thank you I appreciate your help