[Rd] warnings handled oddly in functions with browser calls (PR#13967)
richcalaway at revolution-computing.com
richcalaway at revolution-computing.com
Wed Sep 23 20:45:15 CEST 2009
Full_Name: Rich Calaway
Version: 2.9.2
OS: Windows Vista
Submission from: (NULL) (65.47.30.18)
Consider the following function:
myfun <- function(){
print(log(-1))
browser()
print("Good-bye!")
}
In the default case, with options(warn=0), if I call this function and type
nothing but standard browser commands (c, n, where, Q) at the browser prompt,
the warning produced by log(-1) is shown at the completion of the function, as
expected:
> myfun()
[1] NaN
Called from: myfun()
Browse[1]> c
[1] "Good-bye!"
Warning message:
In log(-1) : NaNs produced
However, if I type any other sort of R expression at the browser prompt, the
warning is issued immediately after that expression's output:
> myfun()
[1] NaN
Called from: myfun()
Browse[1]> print("hello")
[1] "hello"
Warning message:
In log(-1) : NaNs produced
Browse[1]> c
[1] "Good-bye!"
The warnings should be stored until myfun() returns.
This bug has been present at least since 2.7.2, and persists in the current
R-devel build.
Here's the sessionInfo():
> sessionInfo()
R version 2.10.0 Under development (unstable) (2009-09-21 r49780)
i386-pc-mingw32
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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