i thought i had understood this, but maybe not. let's say i have two
vetors a and b of length 120000, should these two expressions be the same?
1. a[b>0]
2. a[b[b>0]]
in my case they turned out to be entirely different
length(a[b>0]) gives 44000
but
length(a[b[b>0]]) gives 15000
is this the correct behavior? i did a test with smaller vector of 100
length, and they seem to be the same.
thanks for any pointers.
fei
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