logicals and replacing values in 3D matrices

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Chad Greene
Chad Greene 2014-2-28
回答： Azzi Abdelmalek 2014-2-28
I have three matrices. Their sizes are as follows:
x is m x n.
y is m x n.
z is m x n x q.
I can redefine all the values in y corresponding to x=2 by y(x==2)=NaN. I'd like to do this for all the corresponding values of z as well. It seems simple, but how do I do this? z(x==2,:) does not work.

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-28
[ii,jj]=find(x==2)
kk=repmat((1:numel(ii))',1,q)';
idx=sub2ind(size(z),repmat(ii,q,1),repmat(jj,q,1),kk(:))
z(idx)=nan

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