Adrian
If test[,2] is numeric then
test[,2] <- -test[,2]
should be all you need. If it isn't numeric you'll need to convert it
first; e.g.,
test[,2] <- -as.numeric(as.character(test[,2]))
which can, of course, be converted back to the original class.
HTH .......
Peter Alspach
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Adrian Johnson
> Sent: Friday, 4 April 2008 10:58 a.m.
> To: r-help
> Subject: [R] convert data frame values
>
> Hello:
> How can I interchange symbols for numeric values in a data frame.
>
> > test
> f s t
> 1 a 1 -1
> 2 b 1 -3
> 3 c -1 1
>
> say I have test d.f . I want to make flip number that are
> positive to negative and negative to positive only for
> numerics in column 's'
>
> my desired result:
>
> > new.test
> f s t
> 1 a -1 -1
> 2 b -1 -3
> 3 c 1 1
>
>
> thanks
> Adrian
>
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>
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