R help - Oct 2004 - replace a value in a vector

OK, so this is a really stupid question and should be incredibly simple to
do but I can't figure it out. So maybe someone would be so kind as to tell
me.
I have a vector of zeros and ones.  I want to replace all of the zeros with
"black" and all of the ones with "gray".  That's it. 
Any help would be
appreciated.

Thanks,
Paul

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,-'-'   `-=_,-'-'   `-=_,-'-'   `-=_,-'-'  
`-=_,-'-'   `-=_,-'-'
Paul Lepp, Ph.D.                       Stanford School of Medicine

VAPAHCS, 154T                   Dept. of Microbiology & Immunology
3801 Miranda Ave                               Stanford University
Palo Alto, CA 94304                                   Stanford, CA
(650) 493-5000 x66762		               fax: (650) 852-3291
http://cmgm.stanford.edu/~pwlepp          pwlepp at cmgm.stanford.edu

ifelse(x == 0, "black", "gray")

--sundar

Paul Lepp wrote:
> OK, so this is a really stupid question and should be incredibly simple to
> do but I can't figure it out. So maybe someone would be so kind as to
tell
> me.
> I have a vector of zeros and ones.  I want to replace all of the zeros with
> "black" and all of the ones with "gray".  That's
it.  Any help would be
> appreciated.
> 
> Thanks,
> Paul
> 
>  `-:-.   ,-;"`-:-.   ,-;"`-:-.   ,-;"`-:-.   ,-;"`-:-. 
,-;"`-:-.
>    `=`,'=/     `=`,'=/     `=`,'=/     `=`,'=/    
`=`,'=/     `=`
>      >==/        >==/        >==/        >==/        >==/
>    ,=,-<=`.    ,=,-<=`.    ,=,-<=`.    ,=,-<=`.    ,=,-<=`. 
,=,
> ,-'-'   `-=_,-'-'   `-=_,-'-'   `-=_,-'-'  
`-=_,-'-'   `-=_,-'-'
> Paul Lepp, Ph.D.                       Stanford School of Medicine
> 
> VAPAHCS, 154T                   Dept. of Microbiology & Immunology
> 3801 Miranda Ave                               Stanford University
> Palo Alto, CA 94304                                   Stanford, CA
> (650) 493-5000 x66762		               fax: (650) 852-3291
> http://cmgm.stanford.edu/~pwlepp          pwlepp at cmgm.stanford.edu
> 
> 
> 
> 
> ------------------------------------------------------------------------
> 
> ______________________________________________
> 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

On Thu, 7 Oct 2004, Paul Lepp wrote:
> OK, so this is a really stupid question and should be incredibly simple to
> do but I can't figure it out. So maybe someone would be so kind as to
tell
> me.
> I have a vector of zeros and ones.  I want to replace all of the zeros with
> "black" and all of the ones with "gray".  That's
it.  Any help would be
> appreciated.
>
You can do this with

yournewvector <-   ifelse(yourvector == 1, "black",
"gray")

but you may actually want to create a factor

yournewvector <- factor(youroldvector,  labels=c("gray",
"black"))


 	-thomas

"Paul Lepp" <pwlepp at pmgm2.stanford.edu> writes:
> OK, so this is a really stupid question and should be incredibly simple to
> do but I can't figure it out. So maybe someone would be so kind as to
tell
> me.
> I have a vector of zeros and ones.  I want to replace all of the zeros with
> "black" and all of the ones with "gray".  That's
it.  Any help would be
> appreciated.
v2 <- ifelse(v==0,"black","gray")

or

v2 <- c("black","gray")[v+1]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907