Hello,
Inline.
Às 03:53 de 08/05/2026, Spencer Graves escreveu:
See also:
file.path(..., fsep = .Platform$file.sep)
On Windows, .Platform$file.sep outputs "/".
https://web.mit.edu/~r/current/lib/R/library/base/html/file.path.html
# on Windows 11 this outputs "/"
.Platform$file.sep
# [1] "/"
file.path(R.home(), "path", "to", "file", fsep = .Platform$file.sep)
# [1] "C:/PROGRA~1/R/R-4.6.0/path/to/file"
# warning, file cannot be found (it doesn't exist)
# but now fsep is "\\"
file.path(R.home(), "path", "to", "file", fsep = .Platform$file.sep) |>
normalizePath()
# [1] "C:\\PROGRA~1\\R\\R-4.6.0\\path\\to\\file"
# no warning, fsep is "\\", ?shortPathName is meant for DOS/Windows
8-dot-3 file names
file.path(R.home(), "path", "to", "file", fsep = .Platform$file.sep) |>
shortPathName()
# [1] "C:\\PROGRA~1\\R\\R-4.6.0\\path\\to\\file"
sessionInfo()
# R version 4.6.0 (2026-04-24 ucrt)
# Platform: x86_64-w64-mingw32/x64
# Running under: Windows 11 x64 (build 22631)
#
# Matrix products: default
# LAPACK version 3.12.1
#
# locale:
# [1] LC_COLLATE=Portuguese_Portugal.utf8
LC_CTYPE=Portuguese_Portugal.utf8
# [3] LC_MONETARY=Portuguese_Portugal.utf8 LC_NUMERIC=C
# [5] LC_TIME=Portuguese_Portugal.utf8
#
# time zone: Europe/Lisbon
# tzcode source: internal
#
# attached base packages:
# [1] stats graphics grDevices utils datasets methods base
#
# loaded via a namespace (and not attached):
# [1] compiler_4.6.0
#
I'm not sure, but help(".Platform") seems to support what I get from
Richard O'Keefe, that "you can safely use / in file name" perhaps no
matter which platform. At one point that was not true, but it may be the
case now.
Yes, that's true for a (long) while, now.
[I am not sure about DOS 2, though. I once programmed a GW-BASIC uniroot
type of equations solver on DOS 2.(*) and called it EQ.POLY.BAS. The
result was to see DIR list it as EQ<TAB>POL but GW-BASIC only accepted
its real name. (*) I don't remember the sub-version number.]
Hope this helps,
Rui Barradas
Sorry: I cannot easily check. Spencer Graves
On 5/7/26 21:30, Richard O'Keefe wrote:
This isn't an R thing. The Windows system calls that accept file names
accept both kinds of slash indifferently. I've seen it said that this
goes
back to MS-DOS 2, but certainly it's all NT versions. If you need to
link
C and/or Fortran with R, you can safely use / in file name strings in
those
languages too.
On Fri, 8 May 2026 at 01:18, Chris Ryan <[email protected]>
wrote:
It had been about a year since I had worked in Windows, and apparently I
had gotten rusty. Forward slashes in path names, as in
read.csv("e:/path/to/datafileOnWindows.csv")
work just fine in R on Windows.
Sorry for the bother.
--Chris Ryan
Chris Ryan wrote:
I'm trying to generalize one of my scripts so that it will run on my
Linux Mint computer at home and my client's Windows 11 computer at
work.
I'm encountering trouble when setting file paths, conditional on
which
computer the script is running on. It's the Windows backslash issue
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and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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