Hi
In addition to the inconsistency in make.names(), the text in ?Reserved
seems incomplete:
"Reserved words outside quotes are always parsed to be references to the
objects linked to in the ‘Description’, and hence they are not allowed
as syntactic names (see make.names). They **are** allowed as
non-syntactic names, e.g. inside backtick quotes."
`..1` and `...` are allowed for assigning, but these symbols cannot be
used in the context of a variable. Example:
`..1` <- 1
`..13` <- 13
`...` <- "dots"
`..1`
#> Error: ..1 used in an incorrect context, no ... to look in
`..13`
#> Error: ..13 used in an incorrect context, no ... to look in
`...`
#> Error in eval(expr, envir, enclos): '...' used in an incorrect context
Does the ?Reserved help page need to mention this oddity, or link to
more detailed documentation?
Best regards
Kirill
On 05.10.18 11:27, Kirill Müller wrote:
Hi
It seems that names of the form "..#" and "..." are not fixed by
make.names(), even though they are reserved words. The documentation
reads:
> [...] Names such as ".2way" are not valid, and neither are the
reserved words.
> Reserved words in R: [...] ... and ..1, ..2 etc, which are used to
refer to arguments passed down from a calling function, see ?... .
I have pasted a reproducible example below.
I'd like to suggest to convert these to "...#" and "....",
respectively. Happy to contribute PR.
Best regards
Kirill
make.names(c("..1", "..13", "..."))
#> [1] "..1" "..13" "..."
`..1` <- 1
`..13` <- 13
`...` <- "dots"
mget(c("..1", "..13", "..."))
#> $..1
#> [1] 1
#>
#> $..13
#> [1] 13
#>
#> $...
#> [1] "dots"
`..1`
#> Error in eval(expr, envir, enclos): the ... list does not contain
any elements
`..13`
#> Error in eval(expr, envir, enclos): the ... list does not contain
13 elements
`...`
#> Error in eval(expr, envir, enclos): '...' used in an incorrect context
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