MATLAB: How to Add Legend to Plotted Data

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Hi. I've plotted 27 cubes with this code: https://www.mathworks.com/matlabcentral/fileexchange/15161-plotcube
 for i=1:size(b,1)
 plotcube([1 1 1],b(i,1:3),1,[1 0 0]);
 end
 for i=1:size(c,1)
 plotcube([1 1 1],c(i,1:3),1,[0 1 0]);
 end
 for i=1:size(d,1)
 plotcube([1 1 1],d(i,1:3),1,[0 0 1]);
 end
and the b,c and d matrices are shown below:
 b =[2     2     3
     3     2     3
     4     2     3
     2     3     3
     3     3     3
     4     3     3
     2     4     3
     3     4     3
     4     4     3];
 c =[2     2     4
     3     2     4
     4     2     4
     2     3     4
     3     3     4
     4     3     4
     2     4     4
     3     4     4
     4     4     4];
 d =[2     2     5
     3     2     5
     4     2     5
     2     3     5
     3     3     5
     4     3     5
     2     4     5
     3     4     5
     4     4     5];
At the end I want to add legend to the plotted cubes based on their colors. How can I do that? Thanks a lot.

Best Answer

Use something like
LineColors = [...] %n by 3 rgb list
ncolor = size(LineColors, 1);
for k=1:ncolor
  Lh(k) = line(nan, nan, 'color', LineColors(k, :)) ;
end
legend(Lh, {'first label', 'second label'... })
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