Mixing
R `options(warning.expression=)` replacement functions unconditionally drop args
I'd like to customize R's prefix for printing-out warnings.
R's standard setting for warning.expression is NULL and works thusly
options(warning.expression=NULL)
warning("this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(msg="this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(xkqp="this is a test of the warning system")
Warning message:
this is a test of the warning system
If, within an Rscript, multiple warnings are encountered within a short period of time (or within a function/closure?), you get something like
Warning messages:
1. this is a test of the warning system
2. second message
However, customization of the warning text doesn't seem customable (without clobbering the message in the warning() call). For example, if I replace warning.expression as follows:
mywarn<-function(...) {
print(paste(
names(substitute(alist(...))),
force(substitute(alist(...))),
sep=" = ",
collapse=";"
))
}
options(warning.expression=quote(mywarn(...)))
warning("this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
warning(msg="this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
whereas using mywarn() directly:
mywarn("this is a test of the warning system", named_parameter="see")
[1] " = alist; = this is a test of the warning system;named_parameter = see"
The closest thing I could find to an explanation of warning.expression was from a mailing list 13 years ago.
The most help in that thread came in a post by Barry Rowlingson suggesting a incomplete implementation in the C source by the R team.
The R documentation itself is insufficient.
warning.expression: an R code expression to be called if a warning is
generated, replacing the standard message. If non-null it is called
irrespective of the value of option warn.
r
asked Jan 3 at 0:22
mpagmpag
211214
add a comment |
I'd like to customize R's prefix for printing-out warnings.
R's standard setting for warning.expression is NULL and works thusly
options(warning.expression=NULL)
warning("this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(msg="this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(xkqp="this is a test of the warning system")
Warning message:
this is a test of the warning system
If, within an Rscript, multiple warnings are encountered within a short period of time (or within a function/closure?), you get something like
Warning messages:
1. this is a test of the warning system
2. second message
However, customization of the warning text doesn't seem customable (without clobbering the message in the warning() call). For example, if I replace warning.expression as follows:
mywarn<-function(...) {
print(paste(
names(substitute(alist(...))),
force(substitute(alist(...))),
sep=" = ",
collapse=";"
))
}
options(warning.expression=quote(mywarn(...)))
warning("this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
warning(msg="this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
whereas using mywarn() directly:
mywarn("this is a test of the warning system", named_parameter="see")
[1] " = alist; = this is a test of the warning system;named_parameter = see"
The closest thing I could find to an explanation of warning.expression was from a mailing list 13 years ago.
The most help in that thread came in a post by Barry Rowlingson suggesting a incomplete implementation in the C source by the R team.
The R documentation itself is insufficient.
warning.expression: an R code expression to be called if a warning is
generated, replacing the standard message. If non-null it is called
irrespective of the value of option warn.
r
asked Jan 3 at 0:22
mpagmpag
211214
add a comment |
I'd like to customize R's prefix for printing-out warnings.
R's standard setting for warning.expression is NULL and works thusly
options(warning.expression=NULL)
warning("this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(msg="this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(xkqp="this is a test of the warning system")
Warning message:
this is a test of the warning system
If, within an Rscript, multiple warnings are encountered within a short period of time (or within a function/closure?), you get something like
Warning messages:
1. this is a test of the warning system
2. second message
However, customization of the warning text doesn't seem customable (without clobbering the message in the warning() call). For example, if I replace warning.expression as follows:
mywarn<-function(...) {
print(paste(
names(substitute(alist(...))),
force(substitute(alist(...))),
sep=" = ",
collapse=";"
))
}
options(warning.expression=quote(mywarn(...)))
warning("this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
warning(msg="this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
whereas using mywarn() directly:
mywarn("this is a test of the warning system", named_parameter="see")
[1] " = alist; = this is a test of the warning system;named_parameter = see"
The closest thing I could find to an explanation of warning.expression was from a mailing list 13 years ago.
The most help in that thread came in a post by Barry Rowlingson suggesting a incomplete implementation in the C source by the R team.
The R documentation itself is insufficient.
warning.expression: an R code expression to be called if a warning is
generated, replacing the standard message. If non-null it is called
irrespective of the value of option warn.
r
asked Jan 3 at 0:22
mpagmpag
211214
I'd like to customize R's prefix for printing-out warnings.
R's standard setting for warning.expression is NULL and works thusly
options(warning.expression=NULL)
warning("this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(msg="this is a test of the warning system")
Warning message:
this is a test of the warning system
warning(xkqp="this is a test of the warning system")
Warning message:
this is a test of the warning system
If, within an Rscript, multiple warnings are encountered within a short period of time (or within a function/closure?), you get something like
Warning messages:
1. this is a test of the warning system
2. second message
However, customization of the warning text doesn't seem customable (without clobbering the message in the warning() call). For example, if I replace warning.expression as follows:
mywarn<-function(...) {
print(paste(
names(substitute(alist(...))),
force(substitute(alist(...))),
sep=" = ",
collapse=";"
))
}
options(warning.expression=quote(mywarn(...)))
warning("this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
warning(msg="this is a test of the warning system")
[1] " = alist;muffleWarning = function() NULL"
whereas using mywarn() directly:
mywarn("this is a test of the warning system", named_parameter="see")
[1] " = alist; = this is a test of the warning system;named_parameter = see"
The closest thing I could find to an explanation of warning.expression was from a mailing list 13 years ago.
The most help in that thread came in a post by Barry Rowlingson suggesting a incomplete implementation in the C source by the R team.
The R documentation itself is insufficient.
warning.expression: an R code expression to be called if a warning is
generated, replacing the standard message. If non-null it is called
irrespective of the value of option warn.
r
r
asked Jan 3 at 0:22
mpagmpag
211214
asked Jan 3 at 0:22
mpagmpag
211214
edited Jan 4 at 23:25
mpag
asked Jan 3 at 0:22
mpagmpag
211214
asked Jan 3 at 0:22
mpagmpag
211214
asked Jan 3 at 0:22
mpagmpag
211214
211214
add a comment |
add a comment |
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