Create 9x9 matrix with RANDI between [0,2] with each 0,1, and 2 repeating three times each per column.

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I'm trying to create a 9x9 matrix with random number generation from 0 to 2 using RANDI:
X = randi([0,2], 9,9)
However, I want to force each of the 9 columns to show an equal distribution of 0's, 1's, and 2's (3 x of each number per column). I'm having difficulty finding a loop that can do this. Any help would be great (very new to this type of MATLAB work).

Accepted Answer

Abdolkarim Mohammadi
Abdolkarim Mohammadi on 23 Sep 2020
Edited: Abdolkarim Mohammadi on 23 Sep 2020
You can first create a vector with the values you need:
Reference = repelem (0:2,3)';
Then you initialize the 9x9 matrix with zeros(), and finally fill in the columns with random permutations of Reference using randperm().
Abdolkarim Mohammadi
Abdolkarim Mohammadi on 23 Sep 2020
Yes. But the number of rows should not change. For example: zeros (9,4). Otherwise, you should update Reference have the same number of elements as the number of rows in M.

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