I have an array in matlab, e.g.
a=rand([3,3])
a =
0.8308 0.9172 0.7537
0.5853 0.2858 0.3804
0.5497 0.7572 0.5678
And now, I would like to set the min value of each row to 0. The result should be:
a =
0.8308 0.9172 0
0.5853 0 0.3804
0 0.7572 0.5678
I have no idea how to use [Y,I]=min(a,[],2) function for this. Thanks.
As you said, you can get the column index of the minimal value of each row using
[~, col] = min(a, [], 2);
Now you can use sub2ind to set the entries to zero:
a( sub2ind(size(a), 1:size(a,1), col.') ) = 0;
You can play with it on ideone.
If you are concern about multiple minima in the same row:
row_min = min(a, [], 2);
a( bsxfun(@eq, row_min, a) ) = 0;
No loops are needed (as opposed to Matt T's answer).
One inefficient method would be to loop through each row and use the find command to find all minima in a particular row.
n = 10;
A = rand(n,n);
for ii = 1:n
ind = find(A(ii,:) == min(A(ii,:)));
A(ii,ind) = 0;
end
If there are multiple minima, this will set all of these to zero.
Hope this helps.
find.