Pick a random column according to specific class data

Question

Yousif Alaraji 2023-3-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1935174-pick-a-random-column-according-to-specific-class-data

评论： Image Analyst 2023-3-27

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

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1935174-pick-a-random-column-according-to-specific-class-data#answer_1200919

在 MATLAB Online 中打开

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