[Rd] ACM license link broken
The URL listed under https://svn.r-project.org/R/trunk/share/licenses/license.db for the ACM license, http://www.acm.org/publications/policies/softwarecrnotice , gives a 404 error. I think this should be replaced by https://www.acm.org/publications/policies/software-copyright-notice ? For what it's worth, the original page did exist as recently as 5 April 2016: https://web.archive.org/web/20160405100845/http://www.acm.org/publications/policies/softwarecrnotice/ Suggestions for where/to whom to report this? R-bugzilla? c...@r-project.org? Here? cheers Ben Bolker __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
[Rd] typo or stale info in qr man
man for `qr` says that the function uses LINPACK's DQRDC, while it in fact uses DQRDC2. ``` The QR decomposition of the matrix as computed by LINPACK or LAPACK. The components in the returned value correspond directly to the values returned by DQRDC/DGEQP3/ZGEQP3 ``` __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] improve 'package not installed' load errors?
On 24/10/2016 1:51 PM, Kevin Ushey wrote:
Hi R-devel,
One of the more common issues that new R users see, and become stumped
by, is error messages during package load of the form:
> library(ggplot2)
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()),
versionCheck = vI[[j]]) :
there is no package called 'Rcpp'
Error: package or namespace load failed for 'ggplot2'
Typically, error messages of this form are caused simply by one or
more dependent packages (in this case, 'Rcpp') not being installed or
available on the current library paths. (A side question, which I do
not know the answer to, is how users get themselves into this state.)
I think one way to get here is to be running with several libraries.
You install ggplot2 while Rcpp is available, but in a different part of
the .libPaths list, then in a later session try to use it with a
different .libPaths setting.
I believe it would be helpful for new users if the error message
reported here was a bit more direct, e.g.
> library(ggplot2)
Error: 'ggplot2' depends on package 'Rcpp', but 'Rcpp' is not installed
consider installing 'Rcpp' with install.packages("Rcpp")
The risk with this message is that Rcpp may really be installed, but
it's just not currently on .libPaths. Detecting that situation and
reporting on it looks like it would be relatively hard: it would mean
the ggplot2 installation needs to record where it found all
dependencies, and if at some later time it doesn't find one, see if that
location still exists and would still work (in which case the message
should suggest modifying .libPaths). I think that's too much work.
Even a simple change like
Error: 'ggplot2' depends on package 'Rcpp', but 'Rcpp' was not found
might not be easy (which function knows both names?) However, if you
want to suggest a patch to implement this, I would take a look.
Duncan Murdoch
In other words, it might be helpful to avoid printing the
'loadNamespace()' call on error (since it's mostly just scary /
uninformative), and check up-front that the package is installed
before attempting to call 'loadNamespace()'. I'm sure a number of
novice users will still just throw their hands up in the air and say
"I don't know what to do", but I think this would help steer a number
of users in the right direction.
(The prescription to suggest installing a package from CRAN if
available might be a step too far, but I think making it more clear
that the error is due to a missing dependent package would help.)
Any thoughts?
Kevin
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Re: [Rd] improve 'package not installed' load errors?
Dear Kevin,
As others have mentioned, it's my sense that this kind of error has become more
frequent -- at least I see students who encounter these errors more frequently.
I agree that a less cryptic error message might help.
Best,
John
--
John Fox, Professor
McMaster University
Hamilton, Ontario, Canada
Web: socserv.mcmaster.ca/jfox
> -Original Message-
> From: R-devel [mailto:r-devel-boun...@r-project.org] On Behalf Of Kevin
> Ushey
> Sent: Monday, October 24, 2016 1:51 PM
> To: R-devel
> Subject: [Rd] improve 'package not installed' load errors?
>
> Hi R-devel,
>
> One of the more common issues that new R users see, and become stumped
> by, is error messages during package load of the form:
>
> > library(ggplot2)
> Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()),
> versionCheck = vI[[j]]) :
> there is no package called 'Rcpp'
> Error: package or namespace load failed for 'ggplot2'
>
> Typically, error messages of this form are caused simply by one or more
> dependent packages (in this case, 'Rcpp') not being installed or
> available on the current library paths. (A side question, which I do not
> know the answer to, is how users get themselves into this state.)
>
> I believe it would be helpful for new users if the error message
> reported here was a bit more direct, e.g.
>
> > library(ggplot2)
> Error: 'ggplot2' depends on package 'Rcpp', but 'Rcpp' is not installed
> consider installing 'Rcpp' with install.packages("Rcpp")
>
> In other words, it might be helpful to avoid printing the
> 'loadNamespace()' call on error (since it's mostly just scary /
> uninformative), and check up-front that the package is installed before
> attempting to call 'loadNamespace()'. I'm sure a number of novice users
> will still just throw their hands up in the air and say "I don't know
> what to do", but I think this would help steer a number of users in the
> right direction.
>
> (The prescription to suggest installing a package from CRAN if available
> might be a step too far, but I think making it more clear that the error
> is due to a missing dependent package would help.)
>
> Any thoughts?
> Kevin
>
> __
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
__
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[Rd] improve 'package not installed' load errors?
Hi R-devel,
One of the more common issues that new R users see, and become stumped
by, is error messages during package load of the form:
> library(ggplot2)
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()),
versionCheck = vI[[j]]) :
there is no package called 'Rcpp'
Error: package or namespace load failed for 'ggplot2'
Typically, error messages of this form are caused simply by one or
more dependent packages (in this case, 'Rcpp') not being installed or
available on the current library paths. (A side question, which I do
not know the answer to, is how users get themselves into this state.)
I believe it would be helpful for new users if the error message
reported here was a bit more direct, e.g.
> library(ggplot2)
Error: 'ggplot2' depends on package 'Rcpp', but 'Rcpp' is not installed
consider installing 'Rcpp' with install.packages("Rcpp")
In other words, it might be helpful to avoid printing the
'loadNamespace()' call on error (since it's mostly just scary /
uninformative), and check up-front that the package is installed
before attempting to call 'loadNamespace()'. I'm sure a number of
novice users will still just throw their hands up in the air and say
"I don't know what to do", but I think this would help steer a number
of users in the right direction.
(The prescription to suggest installing a package from CRAN if
available might be a step too far, but I think making it more clear
that the error is due to a missing dependent package would help.)
Any thoughts?
Kevin
__
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