Taking every nth element from each column in a matrix

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Henry Hallock 2014-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/167100-taking-every-nth-element-from-each-column-in-a-matrix

评论： Jianming Yuan 2021-6-3

采纳的回答： Geoff Hayes

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Hello,

I have a 10x5 matrix:

A = randi(10,10,5);
A =
   8     7     1     4
   8     8     1     7
   8     2     8     8
   3     2    10     6
   7     6     7     8
   6     5     2     3
   4     9     8     8
   1     8     2    10
   8     8     2     9
   4     1     7     1

I would like to make another matrix (B) that contains every 2nd element from each column of A, such that

B =
   8     8     1     7
   3     2    10     6
   6     5     2     3
   1     8     2    10
   4     1     7     1

Thank you.

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采纳的回答

Geoff Hayes 2014-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/167100-taking-every-nth-element-from-each-column-in-a-matrix#answer_162739

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Henry - try grabbing every other row as

B = A(2:2:end,:);

In the above we use 2:2:end to start at row two and consider every other row thereafter (with the second 2) until we reach the end of the rows. The second parameter, :, indicates that we want all column data.

Try the above and see what happens!