Find Min/Max Value of a Column in a Matrix

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Trier87
Trier87 2012-12-25
Hello and Happy Christmas. i have a Variable Buff that is a 231x3 Matrix. My Code looks like this:
Buff = zeros(numel(1286:10:1486)*numel(873:10:973),3);
Ctr = 1;
for step1 = 1286:10:1486
for step2=873:10:973
Main
Buff(Ctr, 1) = step2;
Buff(Ctr, 2) = step1;
Buff(Ctr, 3) = J_Bolzen;
Ctr = Ctr+1;
end
end
save test.dat Buff;
So i have 3 Columns, Column1=step2, Column2=step1 and Column3=J_Bolzen. Now i want find the min Value of the Column3 and the associated Position in the Matrix ( Row and Column ). My first attempt was:
[r c] =find(Buff==min(Buff(:)))
but it looks for the min value of the whole Matrix. It should looks for the min value of Column3 of the Matrix Buff and give the output for that min value and their position in the Matrix
Thanks Guys :-D

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采纳的回答

vipul utsav
vipul utsav 2012-12-25
[r c] =find(Buff==min(Buff(:,3)))
  1 个评论
Walter Roberson
Walter Roberson 2012-12-25
This will return 1 as the column instead of the 3 reflecting the origin in column 3.

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更多回答（2 个）

Walter Roberson
Walter Roberson 2012-12-25
[minval, minidx] = min(Buff(:,3));
The minimum value would be minval, and the position would be (minidx, 3)
Trier87
Trier87 2012-12-25
Thanks it works fine. Is it now possible to give the outpout for the other two colummns too. So i had the min value of column3 and the position ( which row ) and the the two other values of column1 and column2 for the min value of column3
Big Thanks

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