Finding element with max value in each row of a matrix

How can I find the 4 elements with the largest values in each row of a matrix ? Moreover, I would like to know the exact position of them in each row.

i.e. A(2X8) = [ 1 2 3 4 8 5 2 9 ; 5 6 4 7 9 1 1 2; ]

For the above matrix the answer would be:

1st row max values elements: 4, 8, 5, 9

1st row position of these elements: 4, 5, 6, 8

2nd row max values elements: 5, 6, 7, 9

2nd row position of these elements: 1, 2, 4, 5

Any help could be useful.

Thanks in advance!

Answer 1

[Azzi Abdelmalek]

a=[ 1 2 3 4 8 5 2 9 ; 5 6 4 7 9 1 1 2; ]
[ii,jj]=sort(a,2,'descend')
v=ii(:,1:4)
idx=jj(:,1:4)

[Konstantinos]

Thanks a lot!

Answer 2

[Guillaume]

sort your matrix by column and in descending order. The first argument returned are the max, the second their indices:

A = [1 2 3 4 8 5 2 9 ; 5 6 4 7 9 1 1 2]
[maxvals, maxindices] = sort(A, 2, 'descend');
maxvals = maxvals(:, 1:4)
maxindices = maxindices(:, 1:4)

[Konstantinos]

Thanks for your help!..but I want 4 elements from EACH row and their indices. With this I get the max 4 elements and indices of both rows.

[Guillaume]

Yes, I forgot the colon initially. However, I corrected that mistake before you made the comment.

My answer is identical to Azzi's except mine got some explanation (and useful variable names).

[Konstantinos]

You are correct! thanks for your help!