I need to write an if/then statement saying something along the lines of:
if (VALUE is in list) {... How do I write that in R's language. Thanks! 
if(cond) expr if(cond) cons.expr else alt.expr Also see ?ifelse John Kane Kingston ON Canada > Original Message > From: [hidden email] > Sent: Mon, 30 Jul 2012 05:55:34 0700 (PDT) > To: [hidden email] > Subject: [R] If/then statement, if in a list then > > I need to write an if/then statement saying something along the lines of: > if (VALUE is in list) {... > How do I write that in R's language. > Thanks! > > > >  > View this message in context: > http://r.789695.n4.nabble.com/Ifthenstatementifinalistthentp4638346.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/rhelp > PLEASE do read the posting guide > http://www.Rproject.org/postingguide.html > and provide commented, minimal, selfcontained, reproducible code. ____________________________________________________________ FREE 3D EARTH SCREENSAVER  Watch the Earth right on your desktop! ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
In reply to this post by cm
?is.element
Jean cm <[hidden email]> wrote on 07/30/2012 07:55:34 AM: > > I need to write an if/then statement saying something along the lines of: > if (VALUE is in list) {... > How do I write that in R's language. > Thanks! [[alternative HTML version deleted]] ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
Thank you so much Jean!

In reply to this post by Adams, Jean
Not necessarily. If the OP really meant the R list() structure, then
is.element does not apply. If a vector was what was intended, then it does  provide all elements are of the same mode. With such a vague post, it's hard to know.  Bert On Mon, Jul 30, 2012 at 6:06 AM, Jean V Adams <[hidden email]> wrote: > ?is.element > > Jean > > > cm <[hidden email]> wrote on 07/30/2012 07:55:34 AM: >> >> I need to write an if/then statement saying something along the lines > of: >> if (VALUE is in list) {... >> How do I write that in R's language. >> Thanks! > > [[alternative HTML version deleted]] > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/rhelp > PLEASE do read the posting guide http://www.Rproject.org/postingguide.html > and provide commented, minimal, selfcontained, reproducible code.  Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 4677374 Website: http://pharmadevelopment.roche.com/index/pdb/pdbfunctionalgroups/pdbbiostatistics/pdbncbhome.htm ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
On Mon, Jul 30, 2012 at 8:49 AM, Bert Gunter <[hidden email]> wrote:
> Not necessarily. If the OP really meant the R list() structure, then > is.element does not apply. Perhaps... x < list(1:5, "a", `+`, rnorm, NULL, list(letters)) letters %in% x # Works  vectorized, mostly false, but the "a" is there, per below "a" %in% x # Works, true 1 %in% x # Works, false 1:5 %in% x # Works  vectorized, false list(1:5) %in% x # Works, true `+` %in% x # Error NULL %in% x # logical(0) so it seems is.element / %in% [chacun son gout] works with "vectors" (in a rather broad sense of that word) I'm still trying to understand quite how this one works though: list(letters) %in% x # Works  false: this one surprised me! identical(list(letters), x[[6]]) # True Best, Michael ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
Hello,
Em 30072012 19:46, R. Michael Weylandt escreveu: > On Mon, Jul 30, 2012 at 8:49 AM, Bert Gunter <[hidden email]> wrote: >> Not necessarily. If the OP really meant the R list() structure, then >> is.element does not apply. > Perhaps... > > x < list(1:5, "a", `+`, rnorm, NULL, list(letters)) > > letters %in% x # Works  vectorized, mostly false, but the "a" is > there, per below > "a" %in% x # Works, true > > 1 %in% x # Works, false > 1:5 %in% x # Works  vectorized, false > list(1:5) %in% x # Works, true > > `+` %in% x # Error > NULL %in% x # logical(0) > > so it seems is.element / %in% [chacun son gout] works with "vectors" > (in a rather broad sense of that word) > > I'm still trying to understand quite how this one works though: > > list(letters) %in% x # Works  false: this one surprised me! > identical(list(letters), x[[6]]) # True list(list(letters)) %in% x # Works  true identical(letters, x[[6]][[1]]) # True Rui Barradas > > Best, > Michael > > ______________________________________________ > [hidden email] mailing list > https://stat.ethz.ch/mailman/listinfo/rhelp > PLEASE do read the posting guide http://www.Rproject.org/postingguide.html > and provide commented, minimal, selfcontained, reproducible code. ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
In reply to this post by Michael Weylandt
??
On Mon, Jul 30, 2012 at 11:46 AM, R. Michael Weylandt <[hidden email]> wrote: > On Mon, Jul 30, 2012 at 8:49 AM, Bert Gunter <[hidden email]> wrote: >> Not necessarily. If the OP really meant the R list() structure, then >> is.element does not apply. > > Perhaps... > > x < list(1:5, "a", `+`, rnorm, NULL, list(letters)) Note: > is.element((1:5),x) [1] FALSE FALSE FALSE FALSE FALSE ##The answer should be TRUE  the vector (1:5) is a list component. Similarly: > is.element(letters,x) [1] TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE [13] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE [25] FALSE FALSE ## The answer again should be TRUE. > is.element(rnorm,x) Error in match(el, set, 0L) : 'match' requires vector arguments ## The answer should be TRUE. So I do not understand what your point is. I stand by my claim: is.element is not intended for lists, and this is made clear (to me, anyway) in the help file.  Bert > > letters %in% x # Works  vectorized, mostly false, but the "a" is > there, per below > "a" %in% x # Works, true > > 1 %in% x # Works, false > 1:5 %in% x # Works  vectorized, false > list(1:5) %in% x # Works, true > > `+` %in% x # Error > NULL %in% x # logical(0) > > so it seems is.element / %in% [chacun son gout] works with "vectors" > (in a rather broad sense of that word) > > I'm still trying to understand quite how this one works though: > > list(letters) %in% x # Works  false: this one surprised me! > identical(list(letters), x[[6]]) # True > > Best, > Michael  Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 4677374 Website: http://pharmadevelopment.roche.com/index/pdb/pdbfunctionalgroups/pdbbiostatistics/pdbncbhome.htm ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
Sorry, one error:
On Mon, Jul 30, 2012 at 1:18 PM, Bert Gunter <[hidden email]> wrote: > ?? > > On Mon, Jul 30, 2012 at 11:46 AM, R. Michael Weylandt > <[hidden email]> wrote: >> On Mon, Jul 30, 2012 at 8:49 AM, Bert Gunter <[hidden email]> wrote: >>> Not necessarily. If the OP really meant the R list() structure, then >>> is.element does not apply. >> >> Perhaps... >> >> x < list(1:5, "a", `+`, rnorm, NULL, list(letters)) > > Note: >> is.element((1:5),x) > [1] FALSE FALSE FALSE FALSE FALSE > > ##The answer should be TRUE  the vector (1:5) is a list component. > > Similarly: > is.element(list(letters),x) [1] FALSE The answer again should be TRUE. ##################################### > >> is.element(rnorm,x) > Error in match(el, set, 0L) : 'match' requires vector arguments > > ## The answer should be TRUE. > > So I do not understand what your point is. I stand by my claim: > is.element is not intended for lists, and this is made clear (to me, > anyway) in the help file. > >  Bert > > > > > > >> >> letters %in% x # Works  vectorized, mostly false, but the "a" is >> there, per below >> "a" %in% x # Works, true >> >> 1 %in% x # Works, false >> 1:5 %in% x # Works  vectorized, false >> list(1:5) %in% x # Works, true >> >> `+` %in% x # Error >> NULL %in% x # logical(0) >> >> so it seems is.element / %in% [chacun son gout] works with "vectors" >> (in a rather broad sense of that word) >> >> I'm still trying to understand quite how this one works though: >> >> list(letters) %in% x # Works  false: this one surprised me! >> identical(list(letters), x[[6]]) # True >> >> Best, >> Michael > > > >  > > Bert Gunter > Genentech Nonclinical Biostatistics > > Internal Contact Info: > Phone: 4677374 > Website: > http://pharmadevelopment.roche.com/index/pdb/pdbfunctionalgroups/pdbbiostatistics/pdbncbhome.htm  Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 4677374 Website: http://pharmadevelopment.roche.com/index/pdb/pdbfunctionalgroups/pdbbiostatistics/pdbncbhome.htm ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/rhelp PLEASE do read the posting guide http://www.Rproject.org/postingguide.html and provide commented, minimal, selfcontained, reproducible code. 
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