Hi, All:
????? How can I get the names of all the arguments in dots(...)?
????? I'm able to get the name of the first argument but not the second:
deparseDots <- function(...){
? deparse(substitute(...))
}
a <- 1
b <- 2
deparseDots(a, b)
[1] "a"
????? I'd like to get c('a', 'b').
????? Thanks,
????? Spencer Graves
> sessionInfo()
R version 3.4.3 (2017-11-30)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.3
Matrix products: default
BLAS:
/System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats???? graphics? grDevices utils???? datasets? methods base
loaded via a namespace (and not attached):
[1] compiler_3.4.3 tools_3.4.3??? yaml_2.1.16
On 21/02/18 11:36, Spencer Graves wrote:> Hi, All: > > > ????? How can I get the names of all the arguments in dots(...)? > > > ????? I'm able to get the name of the first argument but not the second: > > > > deparseDots <- function(...){ > ? deparse(substitute(...)) > } > a <- 1 > b <- 2 > deparseDots(a, b) > [1] "a" > > > ????? I'd like to get c('a', 'b').Does names(list(...)) do what you want? cheers, Rolf -- Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276
On 20/02/2018 5:47 PM, Rolf Turner wrote:> On 21/02/18 11:36, Spencer Graves wrote: >> Hi, All: >> >> >> ????? How can I get the names of all the arguments in dots(...)? >> >> >> ????? I'm able to get the name of the first argument but not the second: >> >> >> >> deparseDots <- function(...){ >> ? deparse(substitute(...)) >> } >> a <- 1 >> b <- 2 >> deparseDots(a, b) >> [1] "a" >> >> > ????? I'd like to get c('a', 'b'). > > Does > > names(list(...)) > > do what you want?No, that does what he asked for, not what he wants :-). Spencer, you want to deparse all of the expressions in ..., not their names. I think base R doesn't have a way to do this (but I may be wrong). You can do it using some the rlang package. For example, this seems to work: deparseDots <- function(...) { unname(sapply(rlang::exprs(...), deparse)) } Duncan Murdoch
If you want to avoid the inefficiency and memory overhead of first constructing the list and work directly on the language, then I think ?match.call is the tool you want. e.g.> f <- function(...){z <- as.list(match.call())[-1] vapply(z,deparse,"a") }> a <- 1 > b <- 2> f(a,b)[1] "a" "b" I am sure that there are packages that may do this more elegantly and perhaps reliably, though. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Feb 20, 2018 at 2:47 PM, Rolf Turner <r.turner at auckland.ac.nz> wrote:> On 21/02/18 11:36, Spencer Graves wrote: > >> Hi, All: >> >> >> How can I get the names of all the arguments in dots(...)? >> >> >> I'm able to get the name of the first argument but not the second: >> >> >> >> deparseDots <- function(...){ >> deparse(substitute(...)) >> } >> a <- 1 >> b <- 2 >> deparseDots(a, b) >> [1] "a" >> >> > I'd like to get c('a', 'b'). >> > > Does > > names(list(...)) > > do what you want? > > cheers, > > Rolf > > -- > Technical Editor ANZJS > Department of Statistics > University of Auckland > Phone: +64-9-373-7599 ext. 88276 > > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posti > ng-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
Does substitute(...()) do what you want?> myFunc <- function(x, ...) substitute(...()) > myFunc(y=1/(1:10), x=sin(3:1), z=stop("Oops"), "untagged arg")$y 1/(1:10) $z stop("Oops") [[3]] [1] "untagged arg"> names(.Last.value)[1] "y" "z" "" Bill Dunlap TIBCO Software wdunlap tibco.com On Tue, Feb 20, 2018 at 2:36 PM, Spencer Graves < spencer.graves at effectivedefense.org> wrote:> Hi, All: > > > How can I get the names of all the arguments in dots(...)? > > > I'm able to get the name of the first argument but not the second: > > > > deparseDots <- function(...){ > deparse(substitute(...)) > } > a <- 1 > b <- 2 > deparseDots(a, b) > [1] "a" > > > I'd like to get c('a', 'b'). > > > Thanks, > Spencer Graves > > > > sessionInfo() > R version 3.4.3 (2017-11-30) > Platform: x86_64-apple-darwin15.6.0 (64-bit) > Running under: macOS High Sierra 10.13.3 > > Matrix products: default > BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/ > Frameworks/vecLib.framework/Versions/A/libBLAS.dylib > LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/ > libRlapack.dylib > > locale: > [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > loaded via a namespace (and not attached): > [1] compiler_3.4.3 tools_3.4.3 yaml_2.1.16 > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posti > ng-guide.html > and provide commented, minimal, self-contained, reproducible code. >[[alternative HTML version deleted]]
On 2018-02-20 20:52, William Dunlap wrote:> Does substitute(...()) do what you want?????? That's the key.? Thanks very much. ????? Spencer Graves> > > myFunc <- function(x, ...) substitute(...()) > > myFunc(y=1/(1:10), x=sin(3:1), z=stop("Oops"), "untagged arg") > $y > 1/(1:10) > > $z > stop("Oops") > > [[3]] > [1] "untagged arg" > > > names(.Last.value) > [1] "y" "z" "" > > > Bill Dunlap > TIBCO Software > wdunlap tibco.com <http://tibco.com> > > On Tue, Feb 20, 2018 at 2:36 PM, Spencer Graves > <spencer.graves at effectivedefense.org > <mailto:spencer.graves at effectivedefense.org>> wrote: > > Hi, All: > > > ????? How can I get the names of all the arguments in dots(...)? > > > ????? I'm able to get the name of the first argument but not the > second: > > > > deparseDots <- function(...){ > ? deparse(substitute(...)) > } > a <- 1 > b <- 2 > deparseDots(a, b) > [1] "a" > > > ????? I'd like to get c('a', 'b'). > > > ????? Thanks, > ????? Spencer Graves > > > > sessionInfo() > R version 3.4.3 (2017-11-30) > Platform: x86_64-apple-darwin15.6.0 (64-bit) > Running under: macOS High Sierra 10.13.3 > > Matrix products: default > BLAS: > /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib > LAPACK: > /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib > > locale: > [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 > > attached base packages: > [1] stats???? graphics? grDevices utils???? datasets methods base > > loaded via a namespace (and not attached): > [1] compiler_3.4.3 tools_3.4.3??? yaml_2.1.16 > > ______________________________________________ > R-help at r-project.org <mailto:R-help at r-project.org> mailing list -- > To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > <https://stat.ethz.ch/mailman/listinfo/r-help> > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > <http://www.R-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > >[[alternative HTML version deleted]]
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