MATLAB: – swapping a matrix

matrix manipulationswap

a =
     1     3     5     6     7
     2     3     2     3     2
     5     6     7     8     7
b=
     5     2     1     3     7
     6     8     2     3     1
     5     7     8     6     3
how to swap b to a.
ans=
     1     3     5     6     7
     2     3     2     3     2
     5     6     7     8     7

Best Answer

If I understand your latest comment, you begin by finding the unique numbers:
an = unique(a,'stable').'
bn = unique(b,'stable').'
an =
     1     3     5     6     7     2     8
bn =
     5     2     1     3     7     6     8
Now you take all the 5's in b and replace them by 1's, all the 2's by 3's, and so on, all at once (otherwise in a later step all the 1's will be changed back to 5's). You can do this by initializing a new matrix and putting all the numbers in it:
c = zeros(size(b));
for i=1:length(an)
idx = (b==bn(i));
c(idx) = an(i);
end
c
c =
     1     5     7     8     6
     2     3     5     8     7
     1     6     3     2     8
This seems to be what you're saying, although the result is completely different from the answer you provided.
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