How can I store index number and value from a for loop and a problem with optimization

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Bran
Bran 2013-4-30
My problem is two-fold;
I am attempting to store the minimum value from each row of a matrix that is 3x4193 in dimensions;
for i = 1:3
tmp(i) = rand;
dummy(i,:) =(abs(tmp(i) - cumsum_pdf_x));
[val ind] = min(dummy(i,:));
end
I have used to above code but it only gives me min value and corresponding index for one of the rows. How can I get and store the values for all three? Also I then have to increase i to 2915, how can I optimize my code so that it does this easily as it is at the moment causing matlab to crash?
Many thanks in advance :D

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-4-30
编辑：Azzi Abdelmalek 2013-4-30
for i = 1:3
tmp(i) = rand;
dummy(i,:) =abs(tmp(i) - cumsum_pdf_x);
[val1 ind1] = min(dummy(i,:));
val(i)=val1;
ind(i)=ind1
end
Matt J
Matt J 2013-4-30
编辑：Matt J 2013-4-30
Do the minimization outside the loop, in vectorized fashion.
for i = 1:3
tmp(i) = rand;
dummy(i,:) =abs(tmp(i) - cumsum_pdf_x);
end
[val,ind] = min(dummy,[],2);
As for the "crash", we need to see error messages to diagnose that.

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