Hello everyone. How to make a matrix with unequal number of rows and columns, and make the number of rows and columns the same by adding zeros. Thank you very much.

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Wesley 2021-5-31

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评论： Image Analyst 2021-5-31

How to make a matrix with unequal number of rows and columns, and make the number of rows and columns the same by adding zeros.

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Answer 1

Rik 2021-5-31

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https://ww2.mathworks.cn/matlabcentral/answers/844430-hello-everyone-how-to-make-a-matrix-with-unequal-number-of-rows-and-columns-and-make-the-number-of#answer_713585

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This isn't too difficult, as Matlab automatically fills an array with zeros as it is expanded.

S=load(websave('dataA.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/637390/dataA.mat'));
dataA=S.dataA;size(dataA)
ans = 1×2
   375     2
S=load(websave('dataB.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/637385/dataB.mat'));
dataB=S.dataB;size(dataB)
ans = 1×2
   395     2
%Store them in a cell:
c={dataA,dataB};
max_sz=max(cellfun('size',c(:).',1));
for n=find(cellfun('size',c(:).',1) < max_sz)
    c{n}(max_sz,1)=0;
end
max_sz=max(cellfun('size',c(:).',2));
for n=find(cellfun('size',c(:).',2) < max_sz)
    c{n}(1,max_sz)=0;
end
c
c = 1×2 cell array
    {395×2 double}    {395×2 double}

What you do from here is up to you.

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Answer 2

Image Analyst 2021-5-31

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在 MATLAB Online 中打开

Try this:

a = rand(5, 2);
% Get longest dimension.
longestDimension = length(a)
% Make rows and columns of a both be longestDimension by adding zeros:
a(longestDimension, longestDimension) = 0 % Expand shortest dimension.
whos a % Show size in command window

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Answer 3

Mathieu NOE 2021-5-31

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hello

see example code below

clearvars;
load('dataA.mat')
[m,n] = size(dataA);
if m>=n
    out = zeros(m,m);
    out(1:m,1:n) = dataA;
else
    out = zeros(n,n);
    out(1:m,1:n) = dataA;
end
    

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Rik 2021-5-31

Is that comment about cryptic code a jab at my solution? 😉

Image Analyst 2021-5-31

Ha - no Rik. Actually last time I looked there were only two Answers - yours was not there. Actually I admire people who know the cryptic ways of doing things because they're often something I cannot do or understand. It's just that often/usually I give code that looks longer because I have long descriptive variable names and lots of comments and I usually lose out to those who come along with a one liner of alphabet soup because the poster liked that it was very short. However they often come back with something like "well it works but I don't understand it so can you explain it?".

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