How to choose 5 random rows from an array of 8 rows for 10 times and save the 10 results

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tinkiewinkie 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/508937-how-to-choose-5-random-rows-from-an-array-of-8-rows-for-10-times-and-save-the-10-results

评论： J. Alex Lee 2020-3-4

采纳的回答： J. Alex Lee

Hi suppose I have an array of 8 rows as below:

I wish to choose 5 random rows 10 times

Suppose 6,4,8,7,2 is the first random result, how do I save row 6,4,8,7,2 as a input result so that I do not have a different first result if I wish to run the program next time again. And similarly apply it for the rest of the 9 results.

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Answer 1

J. Alex Lee 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/508937-how-to-choose-5-random-rows-from-an-array-of-8-rows-for-10-times-and-save-the-10-results#answer_418458

编辑：J. Alex Lee 2020-3-4

在 MATLAB Online 中打开

if order doesn't matter (6,4,8,7,2 is the same as 4,6,8,7,2)

doc nchoosek

if order does matter (6,4,8,7,2 is different from 4,6,8,7,2)

doc perms

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tinkiewinkie 2020-3-4

i tried nchoosek(1:8,5) and it gave me the combination of all possible 56 combination. How do I choose 10 random combination and saved it as a fixed result?

J. Alex Lee 2020-3-4

在 MATLAB Online 中打开

NumRows = 10
rowindices = randperm(nchoosek(8,5),NumRows)

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How to choose 5 random rows from an array of 8 rows for 10 times and save the 10 results

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