Hi
r-help-bounces at r-project.org napsal dne 04.08.2011 14:56:09:
> a217 <ajn21 at case.edu>
> Odeslal: r-help-bounces at r-project.org
>
> 04.08.2011 14:56
>
> Komu
>
> r-help at r-project.org
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> P?edm?t
>
> [R] Counting rows given conditional
>
> Hello,
>
> I have an input file that contains multiple columns, but the column I'm
> concerned about looks like:
>
> "TR"
> 5
> 0
> 4
> 1
> 0
> 2
> 0
>
> To count all of the rows in the column I know how to do NROW(x$TR) which
> gives 7.
>
> However, I would also like to count only the number of rows with values
>=1
> (i.e. not 0). I've tried NROW(x$TR>=1) which did not give the
intended
> output.
You are quite close.
x$TR>=1
gives you logical vector TRUE/FALSE. You can compute count of TRUE values
by
sum(logical.vector) e.g.
sum(x$TR>=1)
Regards
Petr
>
> Do any of you have any suggestions as to where I'm going wrong?
>
>
>
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