Converting to a square matrix

Question

med-sweng 2014-2-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116781-converting-to-a-square-matrix

评论： Image Analyst 2014-2-20

采纳的回答： Jos (10584)

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In `MATLAB`, say that we have a matrix with the following dimensions:

[11036,1]

How can we convert that to a square matrix?

Thanks.

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Answer 1

Jos (10584) 2014-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/116781-converting-to-a-square-matrix#answer_124936

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N = numel(MyMatrix) 
N2 = ceil(sqrt(N))
if N2^2 > N
  MyMatrix(N2^2) = 0 % pads with zeros if needed
end
MyMatrix = reshape(MyMatrix,N2,N2) % square!

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med-sweng 2014-2-19

Thanks a lot Jos. Very nice answer!

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Answer 2

Image Analyst 2014-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/116781-converting-to-a-square-matrix#answer_124924

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Since sqrt(11036) is not an integer, are you okay with clipping off some elements?

aNew = a(1:(105*105)); % Extract the proper number of elements.
aNew = reshape(a, [105, 105]);  % Make 2D square.

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med-sweng 2014-2-19

Thanks for your reply. Isn't there an automatic way to do that? And, can padding by "0" for instance be done for filling the empty elements?

Image Analyst 2014-2-20

Yes, looks like Jos answered before I could. I'm not sure if you knew in advance that the matrix could not be square when you asked, but if you did, you could have gotten a quicker answer if you had specified whether to clip or pad in your original question. I assumed the clipping option when you evidently wanted the padding option. I guess I could have guessed at both ways but it would be better if you just state all your requirements up front so we don't have to guess.

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