Divide a matrix with an array along a specific dimension
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ANKUR KUMAR
il 16 Mar 2018
Commentato: Beata Opacka
il 26 Mar 2020
A=rand(10,20,30);
B=[1:30];
I want to divide A with B along the third dimension. I got the required result using loop.
for ii=1:30
C(:,:,ii)=A(:,:,ii)/B(ii);
end
But is there any pre-defined function which does the same operation, which takes the dimension as a input along which we want to divide a matrix.
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Stephen23
il 16 Mar 2018
Modificato: Stephen23
il 16 Mar 2018
Once you make the sizes compatible you can do this using standard methods without any loop. Use permute or reshape to get the correct size of B. For example In R2016b and later a standard rdivide will do this:
A ./ reshape(B,1,1,[])
bsxfun(@rdivide,A,reshape(B,1,1,[]))
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Akira Agata
il 16 Mar 2018
How about using arrayfun ?
C = arrayfun(@(k) A(:,:,k)./B(k), 1:30,'UniformOutput',false);
C = cat(3,C{:});
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