making matrices with conditions

hello,

1) How do I make a 6x5 matrice with even whole numbers between 20 and 100 (with 20 and 100 included)

2)How do I make a 6x5 matrice with different whole numbers between 20 and 100

thank you in advance

Answer 1

[Ameer Hamza]

Are you trying to make a matrix with random elements? If yes, then try randi()

lb = 20;
ub = 100;

M_even = randi([lb ub]/2, 6, 5)*2;
M_whole = randi([lb ub], 6, 5);

[Jens Petit-jean]

thanks, I understand the first one but but how do you ensure that the numbers in M_whole are all different?

[Bruno Luong]

2)

M = reshape(19+randperm(81,6*5),[6 5])

[Ameer Hamza]

Bruno's answer using randperm() is easiest and probably most efficient, but if you have Statistics and ML toolbox, you can also try randsample()

M_whole = randsample(20:100, 30, false);
M_whole = reshape(M_whole, [6, 5])

[Jens Petit-jean]

okay thank you very much!