Fast way to replicate array
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Thang Bui
am 28 Apr. 2015
Bearbeitet: Andrei Bobrov
am 28 Apr. 2015
I have a matrix W of size ExF, and I have a matrix D of size NxFxNxE where D(n,:,n,:) = W'
Is there a fast way to replicate W to form D without having to loop through N
Thanks!
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Mohammad Abouali
am 28 Apr. 2015
Bearbeitet: Mohammad Abouali
am 28 Apr. 2015
w=[1 2; ...
3 4; ...
5 6];
N=5;
E=size(w,1);
F=size(w,2);
D=repmat(reshape(w',1,F,1,E),N,1,N,1);
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Andrei Bobrov
am 28 Apr. 2015
Bearbeitet: Andrei Bobrov
am 28 Apr. 2015
i1 = bsxfun(@plus,[0;N]+1,(0:N-1)*(2*N+1));
i2 = bsxfun(@plus,i1,reshape((0:F)*i1(end),1,1,[]));
D = zeros(N,F,N,E);
D(i2) = permute(repmat(W,[1,1,N]),[2,3,1]);
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