[S] vector subscripting question

Fei Chen (fchen@stern.nyu.edu)
Thu, 25 Jun 1998 11:41:39 -0400 (EDT)


hi all,

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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