could anyone tell me how to modify the line without using randsample

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Prabha Kumaresan 2018-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/389423-could-anyone-tell-me-how-to-modify-the-line-without-using-randsample

关闭： MATLAB Answer Bot 2021-8-20

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code:

unused_rows=1:12;
N_UE_rows=2;
rows=unused_rows(randsample(length(unused_rows),N_UE_rows))

If i remove randsample in the above line such that rows=unused_rows(length(unused_rows),N_UE_rows) i am getting error

 Attempted to access unused_rows(12,2); index out of bounds because size(unused_rows)=[1,12].

could anyone help me to fix it.

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Rik 2018-3-20

The number of rows is fixed. The specific rows are not. Is that what you want?

Prabha Kumaresan 2018-3-20

the number of rows and the specific rows in the number of rows as well.

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回答（1 个）

Jan 2018-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/389423-could-anyone-tell-me-how-to-modify-the-line-without-using-randsample#answer_310870

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unused_rows = 1:12;
N_UE_rows   = 2;
rows        = unused_rows(randperm(length(unused_rows), N_UE_rows));

This chooses 2 random values from the vector unused_rows.

if i use randperm only two random values are chosen. but what i actually need is i need to choose all the 12 values such that each group should contain 2.If i run the code next time the same value needs to be selected.

Jan 2018-3-20

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@Prabha: Your question was to write the code without randsample. Now you are asking a different question.

This creates a matrix containing the numbers 1 to 12, where the rows contains two different elements:

reshape(randperm(12), 6, 2)

When I see your other question https://www.mathworks.com/matlabcentral/answers/389430-could-anyone-help-me-how-to-fix-this-issue, it seems, like you want something else.

You have asked 188 questions already and the thread about "How to ask a good question" has been suggested repeatedly. Again: Please care for asking a clear question.

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