sorting in descending order by row

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arad rad
arad rad 2018-8-21
评论： Stephen23 2018-8-22
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
  2 个评论
Stephan
Stephan 2018-8-21
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... ;-)

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采纳的回答

Stephen23
Stephen23 2018-8-21
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

更多回答（1 个）

Stephan
Stephan 2018-8-21
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.

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