Re: [R] an operator for contains
Yes, %in% or is.element().
Reid Huntsinger
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mike R
Sent: Friday, June 17, 2005 4:32 PM
To: r-help@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
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year 2005
month04
day 18
language R
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Re: [R] an operator for contains
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
major2
minor1.0
year 2005
month04
day 18
language R
__
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Re: [R] an operator for contains
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
major2
minor1.0
year 2005
month04
day 18
language R
__
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--
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
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Re: [R] an operator for contains
%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
major2
minor1.0
year 2005
month04
day 18
language R
__
R-help@stat.math.ethz.ch mailing list
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PLEASE do read the posting guide!
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--
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
[EMAIL PROTECTED]
http://www.uni-kiel.de/agrarpol/ahenningsen/
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Re: [R] an operator for contains
On 6/17/05, Mike R [EMAIL PROTECTED] 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
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Re: [R] an operator for contains
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
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Re: [R] an operator for contains
wow. thanks everyone for the multitude of suggestions ! __ R-help@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
