Message-ID: <1150bbc0-93dc-0837-ebc7-1731ebee3a65@prodsyse.com>
Date: 2022-05-01T21:48:05Z
From: Spencer Graves
Subject: "with" doesn't work with names with blanks
In-Reply-To: <CABghstTL+L0XkkMtDk-gS47hWaKpnLCR94W3VH1p73zB+WSziA@mail.gmail.com>
On 5/1/22 4:35 PM, Ben Bolker wrote:
> Think trimws() from base R would work too?
Yes. Thanks. sg
>
> On Sun, May 1, 2022, 5:20 PM Spencer Graves <spencer.graves at prodsyse.com
> <mailto:spencer.graves at prodsyse.com>> wrote:
>
>
>
> On 5/1/22 2:51 PM, Duncan Murdoch wrote:
> > 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$x
> >> [1] 1
> >> ? > with(tst, x)
> >> Error in eval(substitute(expr), data, enclos = parent.frame()) :
> ? ?object 'x' not found>>
> >>
> >> ????? I think it's interesting that "tst$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.
>
>
> but to use that, I have to KNOW that the name is `x `, not `x`.? It
> took
> me a while to identify that as the source of the problem:? What I saw
> was that "with(tst
>
>
> ? ? ? ? ? And thanks for the reminder that you recommend avoiding
> use of "$".
>
>
> ? ? ? ? ? sg
>
>
> p.s.? After I found the problem, I fixed it using
> names(x) <- tis::stripBlanks(names(x))
>
> >
> > 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
> >> ? >
> >>
> >> ______________________________________________
> >> R-devel at r-project.org <mailto:R-devel at r-project.org> mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-devel
> <https://stat.ethz.ch/mailman/listinfo/r-devel>
> >
>
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