I like to arrange the pixels intensity based on the sequence in the matrix

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fathi
fathi 2017-3-22
评论： fathi 2017-4-6
Good evening.
I'd like to arrange the pixels intensity based on the sequence in the matrix EX:
Y = [ 5 4 4 2 ;
6 3 3 1 ;
2 4 2 2;
5 5 6 1]
The answer is supposed to be like :
YY = [5 5 5 4 ;
4 4 2 2 ;
2 2 6 6 ;
3 3 1 1]
Thanks
  2 个评论
Image Analyst
Image Analyst 2017-3-22
Looks like something that might involve histcounts() and repelem()? But I can't make out the rule either. If it was most frequen first, then it should start out with 2, not 5 since there are four 2's but only three 5's.

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Guillaume
Guillaume 2017-3-22
This is probably the logic:
Y = [ 5 4 4 2 ;
6 3 3 1 ;
2 4 2 2;
5 5 6 1]
[values, ~, loc] = unique(Y.', 'stable');
YY = reshape(values(sort(loc)), fliplr(size(Y))).'

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