[R] For loop for distinguishing negative numbers

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 15.07.2009 17:59:39:

> 
> see ?ifelse
> 
> you didn't specify what happens if a value is exactly zero in the 
dataset
> and so i've just bundled it in with the negative case:
> 
> x <- rnorm(20, 0, 1)
> y<-ifelse(x<=0, 10, 5)

For this simple case you can also use the fact that logical vector can be 
used as 0/1 numeric vector.

((x<=0)+1)*5

Regards
Petr

> 
> HTH,
> Tony Breyal 
> 
> 
> cmga20 wrote:
> > 
> > Hi i am very new to R and I have been trying to change each individual
> > piece of data in a data set to 10 if it is below 0 and 5 if it is 
above 0.
> > I know this sounds very easy but i am struggling!!
> > 
> 
> -- 
> View this message in context: http://www.nabble.com/For-loop-for-
> distinguishing-negative-numbers-tp24499872p24500973.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.