logical indexing for row-wise average

2013 3 28
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How can I get a row-wise mean of this matrix
1 2 3
A = 4 5 6
7 8 9
but I only want to select these entries
0 1 1
B = 1 1 0
1 0 1
so the result would be something like
2.5
C = 4.5
8.0
Actually, this is easily possible with a loop, but I'd prefer a 1-line code. (this one is just a question of beauty :-))

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Matt J
Matt J 2013-3-28

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C=sum(A.*B,2)./sum(B,2);

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Vincent
Vincent 2013-3-28
thanks, quite clever using .* instead of indexing, thank you! :-)

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