problem with if in a matrix

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Tristan
Tristan 2013-9-29
编辑： Azzi Abdelmalek 2013-9-29
I have a matrix g:
>> g=sin((1:1:10)'*(1:1:2))
g =
0.8415 0.9093
0.9093 -0.7568
0.1411 -0.2794
-0.7568 0.9894
-0.9589 -0.5440
-0.2794 -0.5366
0.6570 0.9906
0.9894 -0.2879
0.4121 -0.7510
-0.5440 0.9129
when I add the two columns together I get
(g(:, [1])+g(:, [2]))
ans =
1.7508
0.1525
-0.1383
0.2326
-1.5029
-0.8160
1.6476
0.7015
-0.3389
0.3689
I want matlab to return the results of the first column when the results are positive and of the second column when the results are negative, so I tried:
if(g(:, [1])+g(:, [2]))>0
g(:, [1])
else
g(:, [2])
end
but that just gives me the results of the second column.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-9-29
编辑：Azzi Abdelmalek 2013-9-29
idxn=sum(g,2)<0
out=g(:,1);
out(idxn)=g(idxn,2)

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