How can I find X smallest numbers in a Matrix?

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Laila Kazemi
Laila Kazemi 2013-7-2
I have a 480 by 640 matrix, and I would like to find 4 smallest number ( or closest values to zero).

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Matt J
Matt J 2013-7-2
Xs=sort(X(:));
FourSmallest = Xs(1:4);
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Image Analyst
Image Analyst 2013-7-2
You may have more than 4 pixels having the 4 smallest values. You can use ind2sub() or find
[rows1, columns1] = find(yourImage == Xs(1));
[rows2, columns2] = find(yourImage == Xs(2));
[rows3, columns3] = find(yourImage == Xs(3));
[rows4, columns4] = find(yourImage == Xs(4));
Matt J
Matt J 2013-7-2
编辑：Matt J 2013-7-2
in Xind it return the indices as one number
In case it matters, note that the "one number" will work as an index, even when used with the original 480x640 matrix, e.g.,
>> X=reshape((1:20)*10,4,5).'
X =
10 20 30 40
50 60 70 80
90 100 110 120
130 140 150 160
170 180 190 200
>> [Xs, Xind]=sort(X(:));
>> X(Xind(4))
ans =
40

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