k = c(1:9)
if( length( which(k==3) ) ){ print("contained") }else{ print("not
contained") }
is therre a simple way to test if a vector/list contains a particular value?
for example an operator, along the lines of: =
more generally, is the a documentaion page that lists/describes all
such operators?
lastly, if you didn't know the answer to my question, how would you have
gone about searching for an answer? I tried RSiteSearch() using various
terms, and I opened R-2.1.0/library/base/html/00Index.html and searched
for various terms.
TIA
=====================platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 2
minor 1.0
year 2005
month 04
day 18
language R
Yes, %in% or is.element().
Reid Huntsinger
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Mike R
Sent: Friday, June 17, 2005 4:32 PM
To: r-help at stat.math.ethz.ch
Subject: [R] an operator for "contains"
k = c(1:9)
if( length( which(k==3) ) ){ print("contained") }else{ print("not
contained") }
is therre a simple way to test if a vector/list contains a particular value?
for example an operator, along the lines of: =
more generally, is the a documentaion page that lists/describes all
such operators?
lastly, if you didn't know the answer to my question, how would you have
gone about searching for an answer? I tried RSiteSearch() using various
terms, and I opened R-2.1.0/library/base/html/00Index.html and searched
for various terms.
TIA
=====================platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 2
minor 1.0
year 2005
month 04
day 18
language R
______________________________________________
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
Does '?"%in%"' or '?match' meet your needs? spencer graves Mike R wrote:> k = c(1:9) > if( length( which(k==3) ) ){ print("contained") }else{ print("not contained") } > > is therre a simple way to test if a vector/list contains a particular value? > > for example an operator, along the lines of: => > more generally, is the a documentaion page that lists/describes all > such operators? > > lastly, if you didn't know the answer to my question, how would you have > gone about searching for an answer? I tried RSiteSearch() using various > terms, and I opened R-2.1.0/library/base/html/00Index.html and searched > for various terms. > > TIA > > =====================> platform i686-pc-linux-gnu > arch i686 > os linux-gnu > system i686, linux-gnu > status > major 2 > minor 1.0 > year 2005 > month 04 > day 18 > language R > > ______________________________________________ > 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
See match(). Also intersect().
The documentation for operators is, I think mostly at the top of
the index page for the base package, the one you searched. The
relevant one is %in%. I guess "Value matching" didn't ring the
right bell.
On 06/17/05 13:31, Mike R wrote:
k = c(1:9)
if( length( which(k==3) ) ){ print("contained") }else{
print("not contained") }
is therre a simple way to test if a vector/list contains a particular value?
for example an operator, along the lines of: =
more generally, is the a documentaion page that lists/describes all
such operators?
lastly, if you didn't know the answer to my question, how would you have
gone about searching for an answer? I tried RSiteSearch() using various
terms, and I opened R-2.1.0/library/base/html/00Index.html and searched
for various terms.
TIA
===================== platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status
major 2
minor 1.0
year 2005
month 04
day 18
language R
______________________________________________
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
--
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
%in% R> k <- 1:9 R> 3 %in% k [1] TRUE R> 33 %in% k [1] FALSE Arne On Friday 17 June 2005 22:31, Mike R wrote:> k = c(1:9) > if( length( which(k==3) ) ){ print("contained") }else{ print("not > contained") } > > is therre a simple way to test if a vector/list contains a particular > value? > > for example an operator, along the lines of: => > more generally, is the a documentaion page that lists/describes all > such operators? > > lastly, if you didn't know the answer to my question, how would you have > gone about searching for an answer? I tried RSiteSearch() using various > terms, and I opened R-2.1.0/library/base/html/00Index.html and searched > for various terms. > > TIA > > =====================> platform i686-pc-linux-gnu > arch i686 > os linux-gnu > system i686, linux-gnu > status > major 2 > minor 1.0 > year 2005 > month 04 > day 18 > language R > > ______________________________________________ > 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-- Arne Henningsen Department of Agricultural Economics University of Kiel Olshausenstr. 40 D-24098 Kiel (Germany) Tel: +49-431-880 4445 Fax: +49-431-880 1397 ahenningsen at agric-econ.uni-kiel.de http://www.uni-kiel.de/agrarpol/ahenningsen/
On 6/17/05, Mike R <mike.rstat at gmail.com> wrote:> k = c(1:9) > if( length( which(k==3) ) ){ print("contained") }else{ print("not contained") } > > is therre a simple way to test if a vector/list contains a particular value?Yes, several. Here's one: k <- 1:9 if(any(k == 3)) { cat("is an element\n") } else { cat("not an element\n") } I don't recommend that for floating point numbers, though.> more generally, is the a documentaion page that lists/describes all > such operators?help("==") would get you the help page for the actual binary operators. Since any() isn't an operator, that won't help.> lastly, if you didn't know the answer to my question, how would you have > gone about searching for an answer?There are a variety of ways to find answers in R, although if you aren't certain what your keyword should be, it may take a few tries. help(), help.search(), and apropos() may all be useful. Sarah -- Sarah Goslee http://www.stringpage.com
On Fri, 17 Jun 2005, Mike R wrote:> k = c(1:9) > if( length( which(k==3) ) ){ print("contained") }else{ print("not contained") } > > is therre a simple way to test if a vector/list contains a particular value?value %in% vector> more generally, is the a documentaion page that lists/describes all > such operators?No. You can find binary operators fairly effectively by looking at the html help, because they have to have non-alphabetic names (either single characters or beginning and ending with %). However, there are functions such as setdiff() that you might think of as binary operators that you wouldn't find this way. -thomas