how to find maximum value of a column,which satisfies a condition.

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Chandradhar Savanth
Chandradhar Savanth 2013-10-27
评论： Chandradhar Savanth 2013-10-27
hi.. suppose i have a matrix as given below
x f1 f2 rank
0.0002 0.0000 3.9991 1.0000
0.7672 0.5886 1.5198 1.0000
1.0987 1.2071 0.8124 1.0000
1.1767 1.3845 0.6779 1.0000
2.4407 5.9572 0.1943 1.0000
-0.2008 0.0403 4.8434 2.0000
3.0549 9.3324 1.1128 2.0000
3.5944 12.9199 2.5422 3.0000
4.0472 16.3800 4.1911 4.0000
-4.6946 22.0392 44.8175 5.0000
here x,f1,f2,rank represents 1st,2nd,3rd,4th columns respectively of the above matrix.
i want to find maximum value and minimum value of 'f1' column whose 'rank'=1 i.e, my answer should be max.value=5.9572,min.value = 0.0000
similarly max.value and min.value of 'f2' column whose 'rank'=1;i.e, my answer should be
max.value = 3.9991;min.value= 0.1943
is there a method to find out without using loops .
Thank you
with regards,
Chandradhar Savanth.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-10-27
编辑：Azzi Abdelmalek 2013-10-27
You can use max and min function. If M is your matrix
f1=M(:,2);
max_f1=max(f1)
min_f1=min(f1)
% you can do the same for f2
f2=M(:,3);
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