"with" doesn't work with names with blanks

Think trimws() from base R would work too?

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
     >> ? >
     >>
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     >