[R] convert data frame values

[Peter Alspach]

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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