I have data in 3D array and I know indices in the first two dimensions. How do I collect all data without for loop?
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For example
Data(:,:,1) = [1,2,3
4,5,6
7,8,9];
Data(:,:,2) = [11,22,33
44,55,66
77,88,99];
I expect the output to be output(:,:,1) = [1,3
7,5]
output(:,:,2) = [11,33
77,55]
I know that the index are idxRow = [1,1
3,2];
idxCol = [1,3
1,2];
How do I use idxRow and idxCol to extract everything from Data?
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Answers (1)
Matt J
on 18 May 2023
Edited: Matt J
on 18 May 2023
One way
Data(:,:,1) = [1,2,3
4,5,6
7,8,9];
Data(:,:,2) = [11,22,33
44,55,66
77,88,99];
idxRow = [1,1
3,2];
idxCol = [1,3
1,2];
[m,n,p]=size(Data);
idx=sub2ind([m,n],idxRow,idxCol);
D=reshape(Data,[],p);
output = reshape(D(idx,:),[size(idxRow),p])
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