Dear R Users,
another problem for me is the output of a function.
I have several output variables which I give back with the list command.
test <- function {return(list(a,b,c,d,e,f,g,...))}
After the usage of the function I want to assign the variables to the output
variables.
result <- test()
a <- result$a
b <- result$b
c <- result$c
d <- result$d
...
is there a more elegant way to assign these variables, without writing them all
down?
thank you very much for your help!
Stefan Fritsch
?attach or ?with Hope this helps, baptiste On 26 Sep 2008, at 14:57, Stefan Fritsch wrote:> Dear R Users, > > another problem for me is the output of a function. > > I have several output variables which I give back with the list > command. > > test <- function {return(list(a,b,c,d,e,f,g,...))} > > After the usage of the function I want to assign the variables to > the output variables. > > result <- test() > > a <- result$a > b <- result$b > c <- result$c > d <- result$d > ... > > is there a more elegant way to assign these variables, without > writing them all down? > > thank you very much for your help! > > Stefan Fritsch > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code._____________________________ Baptiste Augui? School of Physics University of Exeter Stocker Road, Exeter, Devon, EX4 4QL, UK Phone: +44 1392 264187 http://newton.ex.ac.uk/research/emag
Try this: sapply(names(result), function(nm)assign(nm, result[[nm]], envir = globalenv())) On Fri, Sep 26, 2008 at 10:57 AM, Stefan Fritsch <fritsch at bips.uni-bremen.de> wrote:> Dear R Users, > > another problem for me is the output of a function. > > I have several output variables which I give back with the list command. > > test <- function {return(list(a,b,c,d,e,f,g,...))} > > After the usage of the function I want to assign the variables to the output variables. > > result <- test() > > a <- result$a > b <- result$b > c <- result$c > d <- result$d > ... > > is there a more elegant way to assign these variables, without writing them all down? > > thank you very much for your help! > > Stefan Fritsch > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >-- Henrique Dallazuanna Curitiba-Paran?-Brasil 25? 25' 40" S 49? 16' 22" O
"Stefan Fritsch" <fritsch at bips.uni-bremen.de> wrote:> I have several output variables which I give back with the list command. > > test <- function {return(list(a,b,c,d,e,f,g,...))} > > After the usage of the function I want to assign the variables to the output variables. > > result <- test() > > a <- result$a > b <- result$b > c <- result$c > d <- result$d > ... > > is there a more elegant way to assign these variables, without writing them all down? > > thank you very much for your help!I don't have a good answer for your question, but I do encourage you to choose a method that will be readily intelligible to you when you revisit your code X years later. -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement.
Mike Prager wrote:> "Stefan Fritsch" <fritsch at bips.uni-bremen.de> wrote: > > >> I have several output variables which I give back with the list command. >> >> test <- function {return(list(a,b,c,d,e,f,g,...))} >> >> After the usage of the function I want to assign the variables to the output variables. >> >> result <- test() >> >> a <- result$a >> b <- result$b >> c <- result$c >> d <- result$d >> ... >> >> is there a more elegant way to assign these variables, without writing them all down? >> >>arguably ugly and risky, but simple: for (name in names(result)) assign(name, result[[name]]) (note, for this to work you actually need to name the components of the returned list: return(list(a=a,b=b,...))) vQ
But why do this? Just leave the (preferably named) variables as list components and work with them there. 1. ?comment tells you how to add a comment attribute to the list for self documentation (what were the components? how are they related? etc.) 2. ?with shows you how to access the components of the list individually in the "usual" way. 3. ?lapply and friends shows you how to "loop" over list components . etc. Cheers, Bert Bert Gunter Genentech -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Wacek Kusnierczyk Sent: Friday, September 26, 2008 12:40 PM To: Mike Prager Cc: R help Subject: Re: [R] Return a list Mike Prager wrote:> "Stefan Fritsch" <fritsch at bips.uni-bremen.de> wrote: > > >> I have several output variables which I give back with the list command. >> >> test <- function {return(list(a,b,c,d,e,f,g,...))} >> >> After the usage of the function I want to assign the variables to theoutput variables.>> >> result <- test() >> >> a <- result$a >> b <- result$b >> c <- result$c >> d <- result$d >> ... >> >> is there a more elegant way to assign these variables, without writingthem all down?>> >>arguably ugly and risky, but simple: for (name in names(result)) assign(name, result[[name]]) (note, for this to work you actually need to name the components of the returned list: return(list(a=a,b=b,...))) vQ ______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.