How to change directory for temporary files - problems with huge temporary raster files

问题

I'm desperately trying to writeRaster() but, since the raster is quite large I need a lot of temp memory. The space on my C:/ drive is limited and therefore I want to change the temporary dir to D:/TEMP/. I tried different approaches I found on the Internet like:

Change temporary directory

http://r.789695.n4.nabble.com/How-do-I-set-the-Windows-temporary-directory-in-R-td876483.html

etc.

rasterOptions(tmpdir = "D:/RTEMP/") didn't solve the problem. Even if it worked while the calculation of the raster, it doesn't affect the writeRaster() function.

I would be very thankful, if anybody can help me.

Here is my sessionInfo():

`R version 3.1.2 (2014-10-31)

Platform: x86_64-w64-mingw32/x64 (64-bit)`

回答1:

I got to the right answer:

 write("TMPDIR = D:/rtmp/", file=file.path(Sys.getenv('TMPDIR'), '.Renviron'))
 write("R_USER = D:/rtmp/", file=file.path(Sys.getenv('R_USER'), '.Renviron'))

This changes even the temp-directory of the writeRaster() function

UPDATE:

for those of you, who might have trouble with this error (due to limited permissions)

> write("TMPDIR = D:/rtmp/", file=file.path(Sys.getenv('TMPDIR'), '.Renviron'))
Error in file(file, ifelse(append, "a", "w")) : 
  cannot open the connection
In addition: Warning message:
In file(file, ifelse(append, "a", "w")) :
  cannot open file '/.Renviron': Permission denied

i found that

rasterOptions(tmpdir = "D:/rtmp/")
write("R_USER = D:/rtmp/", file=file.path(Sys.getenv('R_USER'), '.Renviron'))

also solves the issue.

来源：https://stackoverflow.com/questions/27302983/how-to-change-directory-for-temporary-files-problems-with-huge-temporary-raste