R help - Oct 2004 - Checking if an element is part of a vector

Hi!

I want to know if a given element <- ('c64') is part of a vector<-
('c64',  'amiga', 'atari').

Does a function exist for this which gives back a logical value?

thankx
db

"Dominik Bach" <dominik.bach at directbox.com> writes:
> Hi!
> 
> I want to know if a given element <- ('c64') is part of a
vector<- ('c64',  'amiga', 'atari').
> 
> Does a function exist for this which gives back a logical value?
> 'c64' %in% c('c64',  'amiga', 'atari')
[1] TRUE

-- 
   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

?"%in%"
?is.element

On Wed, 6 Oct 2004, Dominik Bach wrote:
> I want to know if a given element <- ('c64') is part of a
vector<-
> ('c64', 'amiga', 'atari').
> 
> Does a function exist for this which gives back a logical value?
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

On Wed, 2004-10-06 at 11:23, Dominik Bach wrote:
> Hi!
> 
> I want to know if a given element <- ('c64') is part of a
vector<-
> ('c64',  'amiga', 'atari'). 
> 
> Does a function exist for this which gives back a logical value?
> 
> thankx
> db
> v <- c("c64",  "amiga", "atari",
"MITS Altair", "pong")
> "c64" %in% v
[1] TRUE

Also, for the position in the vector, you can use:
> which(v == "c64")
[1] 1


See ?"%in%" and ?which for more information.

HTH,

Marc Schwartz

Try

element %in% vector

or look at match()

-roger

Dominik Bach wrote:
> Hi!
> 
> I want to know if a given element <- ('c64') is part of a
vector<- ('c64',  'amiga', 'atari').
> 
> Does a function exist for this which gives back a logical value?
> 
> thankx
> db
> 
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