Dear Henrik, Simon, and Adrian,
As it turns out Adrian's admisc::tryCatchWEM() *almost* does what I want,
which is both to capture all messages and the result of the expression (rather
than the visible representation of the result). I was easily able to modify
tryCatchWEM() to return the result.
Henrik: I was aware that tryCatch() doesn't return the final result of the
expression, and I was previously re-executing the expression to capture the
reult, but only getting the first warning message, along with the result.
Thanks for responding to my question and providing viable solutions,
John
?On 2021-12-02, 5:19 PM, "Henrik Bengtsson" <henrik.bengtsson at
gmail.com> wrote:
Simon's suggestion with withCallingHandlers() is the correct way.
Also, note that if you use tryCatch() to catch warnings, you're
*interrupting* the evaluation of the expression of interest, e.g.
> res <- tryCatch({ message("hey");
warning("boom"); message("there"); 42 }, warning =
function(w) { message("Warning caught: ", conditionMessage(w)); 3.14
})
hey
Warning caught: boom
> res
[1] 3.14
Note how it never completes your expression.
/Henrik
On Thu, Dec 2, 2021 at 1:14 PM Simon Urbanek
<simon.urbanek at r-project.org> wrote:
>
>
> Adapted from demo(error.catching):
>
> > W=list()
> > withCallingHandlers(foo(), warning=function(w) { W <<- c(W,
list(w)); invokeRestart("muffleWarning") })
> > str(W)
> List of 2
> $ :List of 2
> ..$ message: chr "warning 1"
> ..$ call : language foo()
> ..- attr(*, "class")= chr [1:3] "simpleWarning"
"warning" "condition"
> $ :List of 2
> ..$ message: chr "warning 2"
> ..$ call : language foo()
> ..- attr(*, "class")= chr [1:3] "simpleWarning"
"warning" "condition"
>
> Cheers,
> Simon
>
>
> > On Dec 3, 2021, at 10:02 AM, Fox, John <jfox at mcmaster.ca>
wrote:
> >
> > Dear R-devel list members,
> >
> > Is it possible to capture more than one warning message using
tryCatch()? The answer may be in ?conditions, but, if it is, I can't locate
it.
> >
> > For example, in the following only the first warning message is
captured and reported:
> >
> >> foo <- function(){
> > + warning("warning 1")
> > + warning("warning 2")
> > + }
> >
> >> foo()
> > Warning messages:
> > 1: In foo() : warning 1
> > 2: In foo() : warning 2
> >
> >> bar <- function(){
> > + tryCatch(foo(), warning=function(w) print(w))
> > + }
> >
> >> bar()
> > <simpleWarning in foo(): warning 1>
> >
> > Is there a way to capture "warning 2" as well?
> >
> > Any help would be appreciated.
> >
> > John
> >
> > --
> > John Fox, Professor Emeritus
> > McMaster University
> > Hamilton, Ontario, Canada
> > Web: http://socserv.mcmaster.ca/jfox/
> >
> >
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
Interesting exchange of ideas.
A feature that should be included soon in the codebase to help in some
use-cases -- eg. handling thousand database connections on {L,W}AN.
Il Gio 2 Dic 2021, 23:38 Fox, John <jfox at mcmaster.ca> ha scritto:
> Dear Henrik, Simon, and Adrian,
>
> As it turns out Adrian's admisc::tryCatchWEM() *almost* does what I
want,
> which is both to capture all messages and the result of the expression
> (rather than the visible representation of the result). I was easily able
> to modify tryCatchWEM() to return the result.
>
> Henrik: I was aware that tryCatch() doesn't return the final result of
the
> expression, and I was previously re-executing the expression to capture the
> reult, but only getting the first warning message, along with the result.
>
> Thanks for responding to my question and providing viable solutions,
> John
>
> ?On 2021-12-02, 5:19 PM, "Henrik Bengtsson" <henrik.bengtsson
at gmail.com>
> wrote:
>
> Simon's suggestion with withCallingHandlers() is the correct way.
> Also, note that if you use tryCatch() to catch warnings, you're
> *interrupting* the evaluation of the expression of interest, e.g.
>
> > res <- tryCatch({ message("hey");
warning("boom"); message("there");
> 42 }, warning = function(w) { message("Warning caught: ",
> conditionMessage(w)); 3.14 })
> hey
> Warning caught: boom
> > res
> [1] 3.14
>
> Note how it never completes your expression.
>
> /Henrik
>
> On Thu, Dec 2, 2021 at 1:14 PM Simon Urbanek
> <simon.urbanek at r-project.org> wrote:
> >
> >
> > Adapted from demo(error.catching):
> >
> > > W=list()
> > > withCallingHandlers(foo(), warning=function(w) { W <<-
c(W,
> list(w)); invokeRestart("muffleWarning") })
> > > str(W)
> > List of 2
> > $ :List of 2
> > ..$ message: chr "warning 1"
> > ..$ call : language foo()
> > ..- attr(*, "class")= chr [1:3]
"simpleWarning" "warning"
> "condition"
> > $ :List of 2
> > ..$ message: chr "warning 2"
> > ..$ call : language foo()
> > ..- attr(*, "class")= chr [1:3]
"simpleWarning" "warning"
> "condition"
> >
> > Cheers,
> > Simon
> >
> >
> > > On Dec 3, 2021, at 10:02 AM, Fox, John <jfox at
mcmaster.ca> wrote:
> > >
> > > Dear R-devel list members,
> > >
> > > Is it possible to capture more than one warning message using
> tryCatch()? The answer may be in ?conditions, but, if it is, I can't
locate
> it.
> > >
> > > For example, in the following only the first warning message
is
> captured and reported:
> > >
> > >> foo <- function(){
> > > + warning("warning 1")
> > > + warning("warning 2")
> > > + }
> > >
> > >> foo()
> > > Warning messages:
> > > 1: In foo() : warning 1
> > > 2: In foo() : warning 2
> > >
> > >> bar <- function(){
> > > + tryCatch(foo(), warning=function(w) print(w))
> > > + }
> > >
> > >> bar()
> > > <simpleWarning in foo(): warning 1>
> > >
> > > Is there a way to capture "warning 2" as well?
> > >
> > > Any help would be appreciated.
> > >
> > > John
> > >
> > > --
> > > John Fox, Professor Emeritus
> > > McMaster University
> > > Hamilton, Ontario, Canada
> > > Web: http://socserv.mcmaster.ca/jfox/
> > >
> > >
> > >
> > > ______________________________________________
> > > R-devel at r-project.org mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-devel
> > >
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
[[alternative HTML version deleted]]
Hello,
I remembered having seen a function tryCatch.W.E and after an online
search, found where.
It was in a R-Help post and in demo(error.catching). The question by
Marius Hofert [1] was answered, among others, by Martin Maechler [2]
which included the function tryCatch.W.E.
These posts refer to an old thread dated 2004 [3], with an answer by
Luke Tierney [4]. The function withWarnings posted by Luke returns all
warning messages in a list, as seen below.
I repost the function to have this self contained.
withWarnings <- function (expr) {
warnings <- character()
retval <- withCallingHandlers(expr, warning = function(ex) {
warnings <<- c(warnings, conditionMessage(ex))
invokeRestart("muffleWarning")
})
list(Value = retval, Warnings = warnings)
}
withWarnings(foo())
#$Value
#[1] "warning 2"
#
#$Warnings
#[1] "warning 1" "warning 2"
Function tryCatch.W.E is now part of contributed package simsalapar [5],
with credits to Marius and Martin given in its documentation.
[1] https://stat.ethz.ch/pipermail/r-help/2010-December/262185.html
[2] https://stat.ethz.ch/pipermail/r-help/2010-December/262626.html
[3] https://stat.ethz.ch/pipermail/r-help/2004-June/052092.html
[4] https://stat.ethz.ch/pipermail/r-help/2004-June/052132.html
[5] https://CRAN.R-project.org/package=simsalapar
Hope this helps,
Rui Barradas
?s 22:37 de 02/12/21, Fox, John escreveu:> Dear Henrik, Simon, and Adrian,
>
> As it turns out Adrian's admisc::tryCatchWEM() *almost* does what I
want, which is both to capture all messages and the result of the expression
(rather than the visible representation of the result). I was easily able to
modify tryCatchWEM() to return the result.
>
> Henrik: I was aware that tryCatch() doesn't return the final result of
the expression, and I was previously re-executing the expression to capture the
reult, but only getting the first warning message, along with the result.
>
> Thanks for responding to my question and providing viable solutions,
> John
>
> ?On 2021-12-02, 5:19 PM, "Henrik Bengtsson" <henrik.bengtsson
at gmail.com> wrote:
>
> Simon's suggestion with withCallingHandlers() is the correct way.
> Also, note that if you use tryCatch() to catch warnings, you're
> *interrupting* the evaluation of the expression of interest, e.g.
>
> > res <- tryCatch({ message("hey");
warning("boom"); message("there"); 42 }, warning =
function(w) { message("Warning caught: ", conditionMessage(w)); 3.14
})
> hey
> Warning caught: boom
> > res
> [1] 3.14
>
> Note how it never completes your expression.
>
> /Henrik
>
> On Thu, Dec 2, 2021 at 1:14 PM Simon Urbanek
> <simon.urbanek at r-project.org> wrote:
> >
> >
> > Adapted from demo(error.catching):
> >
> > > W=list()
> > > withCallingHandlers(foo(), warning=function(w) { W <<-
c(W, list(w)); invokeRestart("muffleWarning") })
> > > str(W)
> > List of 2
> > $ :List of 2
> > ..$ message: chr "warning 1"
> > ..$ call : language foo()
> > ..- attr(*, "class")= chr [1:3]
"simpleWarning" "warning" "condition"
> > $ :List of 2
> > ..$ message: chr "warning 2"
> > ..$ call : language foo()
> > ..- attr(*, "class")= chr [1:3]
"simpleWarning" "warning" "condition"
> >
> > Cheers,
> > Simon
> >
> >
> > > On Dec 3, 2021, at 10:02 AM, Fox, John <jfox at
mcmaster.ca> wrote:
> > >
> > > Dear R-devel list members,
> > >
> > > Is it possible to capture more than one warning message
using tryCatch()? The answer may be in ?conditions, but, if it is, I can't
locate it.
> > >
> > > For example, in the following only the first warning message
is captured and reported:
> > >
> > >> foo <- function(){
> > > + warning("warning 1")
> > > + warning("warning 2")
> > > + }
> > >
> > >> foo()
> > > Warning messages:
> > > 1: In foo() : warning 1
> > > 2: In foo() : warning 2
> > >
> > >> bar <- function(){
> > > + tryCatch(foo(), warning=function(w) print(w))
> > > + }
> > >
> > >> bar()
> > > <simpleWarning in foo(): warning 1>
> > >
> > > Is there a way to capture "warning 2" as well?
> > >
> > > Any help would be appreciated.
> > >
> > > John
> > >
> > > --
> > > John Fox, Professor Emeritus
> > > McMaster University
> > > Hamilton, Ontario, Canada
> > > Web: http://socserv.mcmaster.ca/jfox/
> > >
> > >
> > >
> > > ______________________________________________
> > > R-devel at r-project.org mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-devel
> > >
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
On Fri, 3 Dec 2021 at 00:37, Fox, John <jfox at mcmaster.ca> wrote:> Dear Henrik, Simon, and Adrian, > > As it turns out Adrian's admisc::tryCatchWEM() *almost* does what I want, > which is both to capture all messages and the result of the expression > (rather than the visible representation of the result). I was easily able > to modify tryCatchWEM() to return the result. >Glad it helps. I would be happy to improve the function, should you send a reprex with the desired final result. Best wishes, Adrian [[alternative HTML version deleted]]