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
>
> __
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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
