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

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

[Walter Roberson]

What is the rule about the order to be used?

[Image Analyst]

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.

Answer 1

[Guillaume]

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))).'

[fathi]

Thank you, Mr. Guillaume,