Converting to a square matrix

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med-sweng
med-sweng 2014-2-19
评论： Image Analyst 2014-2-20
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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采纳的回答

Jos (10584)
Jos (10584) 2014-2-19
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!

更多回答（1 个）

Image Analyst
Image Analyst 2014-2-19
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.
  2 个评论
med-sweng
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
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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