[GRASS-stats] R-GRASS error: "all connections are in use"

[Roger Bivand]

On Fri, 25 Apr 2008, Jarosaw Jasiewicz wrote:

> Hi
> This message apeeared on the begining of the loop or in somewhere in the 
> iteration
>
> please type the full command (full loop) you have used
>
>
>
> uan Manuel Barreneche pisze:
>>  Hello list,
>>
>>  I'm currently using R version 2.5.0 (2007-04-23) in conjunction with
>>  GRASS6.2.2.

Please always include the output of sessionInfo(), in addition to the R 
version. spgrass6 is updated from time to time, so it may be that you are 
- for example - using an obsolete route, although you are using BIL files, 
so I guess that this is readRAST6() in a loop, as Jarek suggested.

Specifically, I think that this problem was solved in R-2.6.0 - the 
relevant news item is:

     o	Connections will be closed if there is no R object referring to
 	them.  A warning is issued if this is done, either at garbage
 	collection or if all the connection slots are in use.

which means that functions do not need to close them explicitly.

Roger

>>
>>  My goal is to use a loop to extract data from rasters created in grass
>>  (a different raster in each simulation, created with r.cost using a
>>  unique cost surface raster, which is deleted every time in order to
>>  free disk space).
>>
>>  Percent complete:  100%
>>  r.out.bin complete.
>>  REMOVE [nombre]
>>   raster
>>   header
>>   category
>>   color    MISSING
>>   history
>>   misc
>>   fcell    MISSING
>>   g3dcell  MISSING
>>  Creating BIL support files ...
>>  Header File =
>>  /home/mastermind/GRASSDATA/prueba/wordlclim/.tmp/torre11b1-4/nombre.hdr
>>  World File =
>>  /home/mastermind/GRASSDATA/prueba/wordlclim/.tmp/torre11b1-4/nombre.wld
>>  Exporting Raster as integer values (bytes=2)
>>  Using the Current Region settings ...
>>  north=-34.474986
>>  south=-34.966653
>>  east=-55.866644
>>  west=-56.558311
>>  r=59
>>  c=83
>>
>>  Porcentaje completado:  100%
>>  r.out.bin complete.
>>  Error in file(paste(fname, "wld", sep = "."), "r") :
>>           all connections are in use
>>
>>  In addition, after this message every time i try a help comand (such
>>  as ?file, ?rbind, etc...) i get the same message:
>>  Error in file(con, "r"): all connections are in use
>>
>>  I've been working with R and GRASS for about 9 months and I'm not much
>>  of a specialist, so i'm really lost here, does anybody have a clue
>>  about the solution of this problem?
>>
>>  many thanks,
>>
>>  Juan Manuel
>>  _______________________________________________
>>  grass-stats mailing list
>>  grass-stats at lists.osgeo.org
>>  http://lists.osgeo.org/mailman/listinfo/grass-stats
>> 
>
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-- 
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