Divide a matrix with an array along a specific dimension

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ANKUR KUMAR
ANKUR KUMAR am 16 Mär. 2018
Kommentiert: Beata Opacka am 26 Mär. 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.

Akzeptierte Antwort

Stephen23
Stephen23 am 16 Mär. 2018
Bearbeitet: Stephen23 am 16 Mär. 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,[])
or for earlier versions use bsxfun:
bsxfun(@rdivide,A,reshape(B,1,1,[]))

Weitere Antworten (1)

Akira Agata
Akira Agata am 16 Mär. 2018
How about using arrayfun ?
C = arrayfun(@(k) A(:,:,k)./B(k), 1:30,'UniformOutput',false);
C = cat(3,C{:});

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