Pick a random column according to specific class data

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I have matrix lets say

1 1 2 2 3 3 4 4

5 8 3 7 2 8 3 9

4 6 8 2 3 4 6 7

2 3 6 7 3 4 6 8

I want to randomly pick columns from each first row class [1 2 3 4]

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Answer 1

Image Analyst 2023-3-25

在 MATLAB Online 中打开

1 个投票

Try randi

A = [...
    1 1 2 2 3 3 4 4
    5 8 3 7 2 8 3 9
    4 6 8 2 3 4 6 7
    2 3 6 7 3 4 6 8];
[rows, columns] = size(A);
% Get random column indexes
randomColumns = randi(columns, rows, 1)
randomColumns = 4×1
     2
     1
     5
     7
% Get values of A there
randomValues = zeros(rows, 1);
for row = 1 : rows
    randomValues(row) = A(row, randomColumns(row));
end
randomValues
randomValues = 4×1
     1
     5
     3
     6

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Yousif Alaraji 2023-3-26

编辑：Yousif Alaraji 2023-3-26

Many thanks,

but can I get one column from each specified Number

1 1 2 2 3 3 4 4

I have these classified columns and I just want random

1 2 3 4

Image Analyst 2023-3-27

Not sure what you're asking. I thought I answered it but maybe you want unique.

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Pick a random column according to specific class data

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Pick a random column according to specific class data

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