loops

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Pieter
Pieter 2011-4-12
Hello,
I have the following problem in Matlab: Consider dataset a, with the following two columns:
0 / 0
0 / 0
1 / 0
1 / 0
1 / 9
0 / 0
-1 / 0
-1 / 4
0 / 0
My problem is that the value 9 has to be spread equally during the time that column 1 is equal to 1. The same has to be done with the value 4 during the time that column 1 is equal to -1. The result I have to obtain is the following:
0 / 0
0 / 0
1 / 3
1 / 3
1 / 3
0 / 0
-1 / 2
-1 / 2
0 / 0
Thanks,
Pieter
  1 个评论
Oleg Komarov
Oleg Komarov 2011-4-12
What have you done so far?

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采纳的回答

the cyclist
the cyclist 2011-4-12
Guessing this is homework, but not sure, so I will give you a solid kick in the right direction. Here is part of what you need to do, with a lot of assumptions about things you were not specific about.
A = [0 0; 0 0; 1 0; 1 0; 1 9; 0 0; -1 0; -1 4; 0 0];
indexToOnes = (A(:,1)==1);
numberOfOnes = sum(indexToOnes);
valueToDistribute = max(A(indexToOnes,2));
A(indexToOnes,2) = valueToDistribute/numberOfOnes
It does not handle the -1 part, which maybe you can figure out for yourself.

更多回答（1 个）

Oleg Komarov
Oleg Komarov 2011-4-12
A = [0 0
0 0
1 0
1 0
1 9
0 0
-1 0
-1 4
0 0];
A(3:5,2) = 3;
A(7:8,2) = 2;

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