Problem with path.expand("~")
On 11/08/2015 10:51 AM, Sarah Goslee wrote:
Hm. On my linux system:
path.expand("~")
[1] "/home/sarahg"
The help file says:
Expand a path name, for example by replacing a leading tilde by
the user's home directory (if defined on that platform).
Does Windows 7 define ~?
Just because RStudio defines it for you, doesn't mean that R shares that
same setup; if R is checking with the operating system, then it depends on
the Windows setup. You could, I assume, define ~ in Windows yourself, or
write your own path.expand() to do so. I have no idea which option the
RStudio designers took.
Could you use getwd() to get the output you're looking for? I would expect
~ to properly be "C:/Users/thierry_onkelinx" and getwd() to be what you've
set Start in as, suggesting that not only did RStudio define ~ for Windows,
they did it in a non-standard way. (Unless your home directory on Windows
should be Documents?)
The tilde meaning "home" is not a concept in Windows, but R fakes it. This is described in ?path.expand and the R for Windows FAQ. Thierry should set the R_USER environment variable to whatever home dir he wants. RStudio is probably doing that for him. Duncan Murdoch
Sarah On Tue, Aug 11, 2015 at 10:41 AM, Thierry Onkelinx <thierry.onkelinx at inbo.be
wrote:
Dear all,
I'm puzzled by the behaviour of path.expand("~")
In the RStudio IDE the output is
path.expand("~")
[1] "C:/Users/thierry_onkelinx/Documents" In the R GUI the output is
path.expand("~")
[1] "~"
But I'm expecting the same result as in the RStudio IDE. The "Start in"
parameter of shortcut to the R GUI has the value
"C:\Users\thierry_onkelinx\Documents"
The problem is that I use normalizePath("~/analysis"). This
yield "C:\\Users\\thierry_onkelinx\\Documents\\analysis" in RStudio
It throws an error in the R GUI
"C:\\Users\\thierry_onkelinx\\Documents\\~\\analysis"
Warning message:
In normalizePath(path.expand(path), winslash, mustWork) :
path[1]="~/analysis": Het systeem kan het opgegeven pad niet vinden
# sessionInfo() in RStudio
R version 3.2.1 (2015-06-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=Dutch_Belgium.1252 LC_CTYPE=Dutch_Belgium.1252
LC_MONETARY=Dutch_Belgium.1252
[4] LC_NUMERIC=C LC_TIME=Dutch_Belgium.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_3.2.1 fortunes_1.5-2
# sessionInfo() from R GUI
R version 3.2.1 (2015-06-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=Dutch_Belgium.1252 LC_CTYPE=Dutch_Belgium.1252
[3] LC_MONETARY=Dutch_Belgium.1252 LC_NUMERIC=C
[5] LC_TIME=Dutch_Belgium.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_3.2.1 fortunes_1.5-2
Best regards,