[R] Is this a bug?

[Weiwei Shi]

one is returned value, the other one is the result from print

> t0 <- ifelse(T, print("h"), print("e"))
[1] "h"
> t0
[1] "h"

HTH,

weiwei

On 4/17/07, Luca Braglia <lbraglia at gmail.com> wrote:
> I have found a strange "ifelse" behaviour (I think)
>
> This works:
>
> > ifelse(T,1+1,1+2)
> [1] 2
> > ifelse(F,1+1,1+2)
> [1] 3
>
> Maybe I missed something about R internals, but why
>
> > ifelse(T,print("hello"),print("goodbye"))
> [1] "hello"
> [1] "hello"
> > ifelse(F,print("hello"),print("goodbye"))
> [1] "goodbye"
> [1] "goodbye"
>
> values are returned two times? I'm not sure: if it's a bug I'll post it
> immediately
>
> Thank You
>
>         Luca
>
>
> Version:
>  platform = i486-pc-linux-gnu
>  arch = i486
>  os = linux-gnu
>  system = i486, linux-gnu
>  status =
>  major = 2
>  minor = 4.1
>  year = 2006
>  month = 12
>  day = 18
>  svn rev = 40228
>  language = R
>  version.string = R version 2.4.1 (2006-12-18)
>
> Locale:
> LC_CTYPE=it_IT.UTF-8;LC_NUMERIC=C;LC_TIME=it_IT.UTF-8;LC_COLLATE=it_IT.UTF-8;LC_MONETARY=it_IT.UTF-8;LC_MESSAGES=it_IT.UTF-8;LC_PAPER=it_IT.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=it_IT.UTF-8;LC_IDENTIFICATION=C
>
> Search Path:
>  .GlobalEnv, package:MASS, package:utils, package:stats, package:graphics, package:grDevices, package:methods, Autoloads, package:base
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>


-- 
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III