Indexing into a 3d matrix with a loop

Three minute video shows the indexing into a 3d matrix.

Description

The MATLAB user has this:

clear
clc

M(:,:,1) = [1,2;3,4];
M(:,:,2) = [21,22;23,24];
                    
J = [1,2; 2,1];
                    
They want this:
ans = [1 22
           23 4]
                    
They found that
D = M(:,:,J) % This doesn't work

This video discusses this solution:
                    
[nR, nC] = size(J);
D = zeros(nR,nC);
for r = 1:nR
     for c = 1:nC
           D(r,c) = M(r,c,J(r,c));
     end
end
                    
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• MATLAB release: MATLAB 7.7 (R2008b)
• HTML Files: Video from http://blogs.mathworks.com/pick
• Other Files: 135 Basic indexing 3d.flv, ; 135 Basic indexing 3d.js, ; 135 Basic indexing 3d_config.xml, ; 135 Basic indexing 3d_controller.swf, ; 135 Basic indexing 3d_nofp_bg.gif, ; 135 Basic indexing 3d_preload.swf, ; FlashTemplate.css, ; mCode/main.m, ; ProductionInfo.xml, ; swfobject.js