[R-sig-Geo] readRAST6: too many open files

[Roger Bivand]

On Tue, 5 May 2009, Agustin Lobo wrote:

> We're using
> rastdum <- readRAST6("nomdum",cat=F,ignore.stderr = T)
>
> (on a ubuntu 8.10 machine and R 2.9)
> within a for() loop of hundreds of iterations.
>
> At some point (ca. 199) we get an error
> "Too many open files"
>
> and suspect that this is because readRAST6() is opening
> and not closing files. Is this a bug?

Possibly, but a complete sessionInfo() would be necessary - the versions 
of the packages involved may matter. Does this reproduce with readRAST6() 
in a loop reading say the same raster? I've run 300 reads of spearfish 
elevation.dem without seeing problems for:

> sessionInfo()
R version 2.9.0 (2009-04-17)
i386-pc-mingw32

locale:
LC_COLLATE=Norwegian (Bokmål)_Norway.1252;LC_CTYPE=Norwegian 
(Bokmål)_Norway.1252;LC_MONETARY=Norwegian 
(Bokmål)_Norway.1252;LC_NUMERIC=C;LC_TIME=Norwegian (Bokmål)_Norway.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] spgrass6_0.6-5 XML_2.3-0      rgdal_0.6-8    sp_0.9-36

loaded via a namespace (and not attached):
[1] grid_2.9.0      lattice_0.17-22

Roger

> I remember having
> a similar problem with writeGDAL() on a win machine a long ago,
> but that problem was fixed.
>
> Thanks
>
> Agus
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no