Stack a certain vectors of a matrix vertically

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I have a hypothetical matrix say a =

   2     3
   4     5
   5     6

in one command, how I can stack the first two columns vertically to have a=[1 2 3 2 4 5]'

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the cyclist 2018-6-14

You could make this an answer (rather than a comment on the question).

Niveen El Zayat 2018-6-14

I left it as a comment because i am not quite satisfied with this answer, I leave the space to some one give me a more generic answer fit any dimension

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Answer 1

Guillaume 2018-6-14

编辑：Guillaume 2018-6-14

在 MATLAB Online 中打开

1 个投票

As you've figured out for a 3xN matrix, a(1:6)' would work. For an arbitrary sized MxN matrix:

reshape(a(:, 1:2), [], 1)

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Niveen El Zayat 2018-6-14

thanks, this is the answer I was looking for, because the above one is very simple hypothetical example my main code is in terms of large dimension and i did try the reshape command but i failed many time

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Stack a certain vectors of a matrix vertically

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Stack a certain vectors of a matrix vertically

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