I believe the answer is that you are missing something: partial matching.
The 651'st elt of colors() is "whitesmoke", so it is ambiguous whether
"whit" matches "white" or "whitesmoke". When you leave out the 651'st
elt, "whit" happily matches "white".
> which(substring(colors(), 1, 4)=="whit")
[1] 1 651
> colors()[which(substring(colors(), 1, 4)=="whit")]
[1] "white" "whitesmoke"
> match.arg("whit", colors()[1:650])
[1] "white"
> match.arg("whit", colors())
Error in match.arg("whit", colors()) :
'arg' should be one of “white”, “aliceblue”, ...
> match.arg("whit", colors()[c(1,651)])
Error in match.arg("whit", colors()[c(1, 651)]) :
'arg' should be one of “white”, “whitesmoke”
>
-- Tony Plate
Joerg van den Hoff wrote:
I observed the following:
match.arg("white", colors())
yields 'white', but
match.arg("whit", colors())
yields:
`Error in match.arg("whit", colors()) :
'arg' should be one of "white", "aliceblue", '...
this message actually comes from `pmatch'. using a suitable subset of
`colors()' works OK. the precise length were the error occurs seems to
depend on `arg' and `choices'. e.g.
match.arg("whit", colors()[1:650])
works
but the limit seems not be fixed. in another setting it
happend around a length of `choices' of around 130. maybe a memory management
related
bug? or am I missing something?
regards,
joerg
platform powerpc-apple-darwin8.11.1
arch powerpc
os darwin8.11.1
system powerpc, darwin8.11.1
status
major 2
minor 9.2
year 2009
month 08
day 24
svn rev 49384
language R
version.string R version 2.9.2 (2009-08-24)
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