[R] trying to install plotrix

[David Epstein]

Here are the error messages:
> install.packages('plotrix')
Warning in install.packages("plotrix") :
  argument 'lib' is missing: using '/Users/dbae/Library/R/library'
--- Please select a CRAN mirror for use in this session ---
Error in .install.macbinary(pkgs = pkgs, lib = lib, contriburl = contriburl, 
: 
  unable to create temporary directory '/tmp/RtmpSTiTJX/downloaded_packages'
In addition: Warning message:
In dir.create(tmpd) :
  cannot create dir '/tmp/RtmpSTiTJX/downloaded_packages', reason 'No such
file or directory'

I can't understand this. Surely install.packages can create the necessary
directories if it needs them. I thought there might be a problem of
permissions, so
I tried the following csh commands on my Mac:

Tottie:~/<5>archive% ls -l /tmp
lrwxr-xr-x   1 root  admin  11 Aug  7  2008 /tmp@ -> private/tmp
Tottie:~/<5>archive% ls -ld /private/tmp
drwxrwxrwt   19 root  wheel  646 Sep 22 09:13 /private/tmp/
Tottie:~/<5>archive% ls -l /private/tmp
total 48
drwx------   3 dbae      wheel   102 Sep 22 10:41 502/
drwxr-xr-x   2 rona      wheel    68 Sep 21 16:25 506/
drwxrwxrwx   5 dbae      wheel   170 Sep 20 16:47 FLEXnet/
-rw-r--r--   1 _usbmuxd  wheel     0 Sep 18 15:38 MobileDevice.log
-rw-r--r--   1 dbae      wheel  1185 Sep 20 22:39 alm.log
-rw-r--r--   1 dbae      wheel  2928 Sep 20 22:39 amt.log
-rw-r--r--   1 dbae      wheel     0 Sep 20 16:47 cs_cache_lock_502
-rw-r--r--   1 security  wheel     0 Sep 21 13:37 cs_cache_lock_92
drwxr-xr-x   3 dbae      wheel   102 Sep 22 10:10 hsperfdata_dbae/
-rw-------   1 nobody    wheel    36 Sep 22 10:51
objc_sharing_ppc_4294967294
-rw-------   1 dbae      wheel   324 Sep 22 11:03 objc_sharing_ppc_502
-rw-------   1 rona      wheel    84 Sep 21 18:23 objc_sharing_ppc_506
-rw-------   1 security  wheel    24 Sep 22 09:13 objc_sharing_ppc_92
drwx------   3 dbae      wheel   102 Sep 13 20:04 ssh-6v6iI1izHg/

Thanks for any help.
David
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