On Thu, 19 Nov 2009, Agustin Lobo wrote:
Hi!
The following works:
doGRASS("r.grow.distance",flags=c("overwrite"),parameters=list(distance="dummyd",input="dummy"))
[1] "r.grow.distance --overwrite distance=dummyd input=dummy"
But using "o" instead of "overwrite" does not
Because only "overwrite" is included in
r.grow.distance --interface-description
and that is what the flags are checked against. Unfortunately, many XML
descriptions are more demanding than the help pages, but for parseGRASS()
to work, it must use the self-definition without exception. execGRASS() is
designed for scripting, in which case keeping to tighter limits than the
help pages is OK. Some commands have both "o" and "overwrite" for
different things too, so confusion would ensue.
Roger
doGRASS("r.grow.distance",flags=c("o"),parameters=list(distance="dummyd",input="dummy"))
Error in doGRASS("r.grow.distance", flags = c("o"), parameters =
list(distance = "dummyd", :
Invalid flag value: o
despite the fact that the grass manual states:
r.grow.distance --help
...(stuff deleted)
Usage:
r.grow.distance input=name [distance=name] [value=name]
[metric=string] [--overwrite] [--verbose] [--quiet]
Flags:
--o Allow output files to overwrite existing files
--v Verbose module output
--q Quiet module output
...(stuff deleted)
Could it be possible that execGRASS accept both forms for consistency with
the grass command? If this is not possible or appropriate, could a note be
added to the execGRASS manual page?
Thanks
Agus
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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: [email protected]
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