Re: [Rd] Small request of a feature improvement in the next version of R
On Mon, 2015-11-16 at 20:11 -0500, Paul Grosu wrote:
> Hi Everyone,
>
> Sorry to bother the list with this small request, but I've run into this
> issue and was wondering if it could be fixed in the next version of R.
> Sorry if it was raised in a previous thread:
>
> So when I try the following I get an error:
>
> > m <- list()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- 3
> > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23)
> Error in m[["A3V6HVSALQ835D"]][["stars"]] <- c(1, 23) :
> more elements supplied than there are to replace
>
> As does the following:
>
> > m <- list()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- c()
> > m[["A3V6HVSALQ835D"]][['stars']] <- c()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- 3
> > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23)
> Error in m[["A3V6HVSALQ835D"]][["stars"]] <- c(1, 23) :
> more elements supplied than there are to replace
>
> But when I reverse the order, I don't:
>
> > m <- list()
> > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23)
> > m[["A3V6HVSALQ835D"]][['profiles']] <- 3
>
> As doesn't the following, with the order reversed for the assignment:
>
> > m <- list()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- c()
> > m[["A3V6HVSALQ835D"]][['stars']] <- c()
> > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23)
> > m[["A3V6HVSALQ835D"]][['profiles']] <- 3
>
> And when I instantiate it in this way, it does not with the original order:
>
> > m <- list()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- c()
> > m[["A3V6HVSALQ835D"]][['stars']] <- list()
> > m[["A3V6HVSALQ835D"]][['profiles']] <- 3
> > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23)
>
> The request is so that order-specific assignments would not throw an error,
> and I am using version 3.2.2 of R.
Your example combines two nested calls to the replacement function
"[[<-". It is a lot easier to understand what is going wrong if you
break this down into two separate function calls.
First, the element of m that you want to modify is NULL:
> m <- list()
> m[["A3V"]]
NULL
So the expression
> m[["A3V"]][['profile']] <- 3
is equivalent to:
> tmp <- NULL
> tmp[['profile']] <- 3
> m[["A3V"]] <- tmp
Inspecting the result:
> m
$A3V
profile
3
> class(m$A3V)
[1] "numeric"
So m$A3V is a numeric vector and not, as you expected, a list. This
behaviour of "[[<-" when applied to NULL objects is documented on the
help page: See help("[[<-")
The solution is to create m[["A3V"]] as a list before modifying its
elements:
> m <- list()
> m[["A3V"]] <- list()
...
Martyn
> Thank you,
> Paul
>
> __
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
---
This message and its attachments are strictly confidenti...{{dropped:8}}
__
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] Small request of a feature improvement in the next version of R
Hi Everyone, Sorry to bother the list with this small request, but I've run into this issue and was wondering if it could be fixed in the next version of R. Sorry if it was raised in a previous thread: So when I try the following I get an error: > m <- list() > m[["A3V6HVSALQ835D"]][['profiles']] <- 3 > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23) Error in m[["A3V6HVSALQ835D"]][["stars"]] <- c(1, 23) : more elements supplied than there are to replace As does the following: > m <- list() > m[["A3V6HVSALQ835D"]][['profiles']] <- c() > m[["A3V6HVSALQ835D"]][['stars']] <- c() > m[["A3V6HVSALQ835D"]][['profiles']] <- 3 > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23) Error in m[["A3V6HVSALQ835D"]][["stars"]] <- c(1, 23) : more elements supplied than there are to replace But when I reverse the order, I don't: > m <- list() > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23) > m[["A3V6HVSALQ835D"]][['profiles']] <- 3 As doesn't the following, with the order reversed for the assignment: > m <- list() > m[["A3V6HVSALQ835D"]][['profiles']] <- c() > m[["A3V6HVSALQ835D"]][['stars']] <- c() > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23) > m[["A3V6HVSALQ835D"]][['profiles']] <- 3 And when I instantiate it in this way, it does not with the original order: > m <- list() > m[["A3V6HVSALQ835D"]][['profiles']] <- c() > m[["A3V6HVSALQ835D"]][['stars']] <- list() > m[["A3V6HVSALQ835D"]][['profiles']] <- 3 > m[["A3V6HVSALQ835D"]][['stars']] <- c(1, 23) The request is so that order-specific assignments would not throw an error, and I am using version 3.2.2 of R. Thank you, Paul __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Small request.
As of a few weeks ago, rtools does store the current version in the registry but its only a gross figure such as 2.7 or 2.8 and that would not be enough to identify the build. On Tue, May 27, 2008 at 4:45 PM, [EMAIL PROTECTED] wrote: This is (hopefully) a small request. I routinely build (and test) both R versions from sources on my system (WinXP). I would like to be sure that I have the current version of Rtools. I always go to Robert Murdoch's site Building R for Windows and check the latest news. Everything I need is explained there, except I never know if I have the most recent version of Rtools.exe. I see Rtools28.exe but my understanding is that this file is refreshed quite frequently. Is so, would it be possible to include some version numbering scheme in its name? Perhaps a build date stamp can be included instead? Thanks in advance, Andy __ Andy Jaworski 518-1-01 Process Laboratory 3M Corporate Research Laboratory - E-mail: [EMAIL PROTECTED] Tel: (651) 733-6092 Fax: (651) 736-3122 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Small request.
Sorry for the mix-up with Robert Murdoch. I do not know what I was thinking. I just wanted to clarify what would be useful to me. If possible, I would like to have some kind of indication on the website what version of Rtools28 (or some future Rtools) is the most current. This way, I would know whether I needed to download and install it. I do not care much what it writes into registry. Andy __ Andy Jaworski 518-1-01 Process Laboratory 3M Corporate Research Laboratory - E-mail: [EMAIL PROTECTED] Tel: (651) 733-6092 Fax: (651) 736-3122 Gabor Grothendieck [EMAIL PROTECTED] To ail.com [EMAIL PROTECTED] Sent by: cc [EMAIL PROTECTED] r-devel@r-project.org -project.org Subject Re: [Rd] Small request. 05/27/2008 04:38 PM As of a few weeks ago, rtools does store the current version in the registry but its only a gross figure such as 2.7 or 2.8 and that would not be enough to identify the build. On Tue, May 27, 2008 at 4:45 PM, [EMAIL PROTECTED] wrote: This is (hopefully) a small request. I routinely build (and test) both R versions from sources on my system (WinXP). I would like to be sure that I have the current version of Rtools. I always go to Robert Murdoch's site Building R for Windows and check the latest news. Everything I need is explained there, except I never know if I have the most recent version of Rtools.exe. I see Rtools28.exe but my understanding is that this file is refreshed quite frequently. Is so, would it be possible to include some version numbering scheme in its name? Perhaps a build date stamp can be included instead? Thanks in advance, Andy __ Andy Jaworski 518-1-01 Process Laboratory 3M Corporate Research Laboratory - E-mail: [EMAIL PROTECTED] Tel: (651) 733-6092 Fax: (651) 736-3122 __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
