How to duplicate rows of a matrix if the number of copies for each row are different?
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Hi all,
I want to duplicate each rows of a matrix according to the numbers given in a vector.
For example, I have matrix A and vector
, I want to duplicate the first row of A 2 times, second row by 4 times and third row by 5 times.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/794749/image.png)
Is there any way to do this?
Thank you for your help.
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采纳的回答
Stephen23
2021-11-9
编辑:Stephen23
2021-11-9
out = repelem(A,b,1)
更多回答(2 个)
Sulaymon Eshkabilov
2021-11-9
It can be done in a few different ways, e.g.:
A = magic(3)
b = [2, 4, 5];
AA = [repmat(A(1,:), b(1),1);repmat(A(2,:), b(2),1); repmat(A(3,:), b(3),1)]
% Alternative way:
A = magic(3);
b = [2, 4, 5];
AA =[];
for ii = 1:numel(b)
AA = [AA; repmat(A(ii,:), b(ii),1)];
end
AA
2 个评论
Sulaymon Eshkabilov
2021-11-9
I don't believe there is an alternative more efficient way than using [for .. end] or [while .. end] loop.
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