sorting in descending order by row

hi, i have a square matrix and i need to sort it in descending order in each row, i mean from left to right along columns for each row. all the functions like sort and sortrow are in ascending order or sort in descending order by column ! thank you

[Stephan]

If you need a good performance, then accept the answer given by Stephen Cobeldick:

A = rand(12000) - 0.5;
tic
B = sort(A,2,'descend'); % The way i did it
toc
tic
C = -sort(-A.').'; `% the way Stephen Cobeldick did
toc

with result:

>> sort_performance
Elapsed time is 3.725967 seconds. 
Elapsed time is 2.971930 seconds.

and the winner is... ;-)

[arad rad]

thanks it was really helpful

Answer 1

[Stephen23]

Where M is your matrix:

>> M = randi(9,4)
M =
   6   1   9   5
   5   1   8   8
   6   4   9   9
   6   3   3   4
>> -sort(-M.').'
ans =
   9   6   5   1
   8   8   5   1
   9   9   6   4
   6   4   3   3

[arad rad]

thank u

[Stephen23]

@arad rad: you should really use Stephan Jungs's answer.

Answer 2

[Stephan]

Hi,

use:

A =

      10   -12     4     8
       6    -9     8     0
       2     3    11    -2
       1     1     9     3

>> sort(A,2,'descend')

ans =

      10     8     4   -12
       8     6     0    -9
      11     3     2    -2
       9     3     1     1

to sort descending in row-direction.

[Stephen23]

+1 for doing it properly.