On 01/05/2022 3:41 p.m., Spencer Graves wrote:> Hello, All:
>
>
> Column names in a data.frame are not supposed to have trailing
> blanks. However, a CRAN package created one, which threw an error with
> "with". Consider the following example:
>
>
> > (tst <- data.frame(1))
> X1
> 1 1
> > names(tst) <- 'x '
> > tst$x
> [1] 1
> > with(txt, x)
> Error in with(txt, x) : object 'txt' not found
>
>
> I think it's interesting that "tst$x" works, but
"with(txt, x)".
>
>
> Comments?
tst$x works because of partial name matching. (That leniency is one of
the reasons for advice to avoid using $ in programs.) It would be chaos
if with() used partial name matching.
You can use
with(txt, `x `)
to include the space in the name.
Duncan Murdoch
>
>
> It's not a major problem, though it took me a while to diagnose. (I
> reported it to the maintainer of the package that returned a data.frame
> with names with trailing blanks.)
>
>
> Thanks, for all your work in maintaining and upgrading R -- and in
> responding to emails from this list.
>
>
> Spencer Graves
>
>
> > sessionInfo()
> R version 4.2.0 (2022-04-22)
> Platform: x86_64-apple-darwin17.0 (64-bit)
> Running under: macOS Big Sur 11.6.5
>
> Matrix products: default
> LAPACK:
> /Library/Frameworks/R.framework/Versions/4.2/Resources/lib/libRlapack.dylib
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> loaded via a namespace (and not attached):
> [1] compiler_4.2.0 tools_4.2.0
> >
>
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