On Tue, 1 Sep 2009, alexandre villers wrote:
Good evening,Thank you for the message. I had already tried this but then got the error message: execGRASS("v.mkgrid", flags="overwrite", parameters=list(map="grilleTest", grid=paste(as.integer(100), as.integer(100), sep=","), box=paste(as.integer(5000),",",as.integer(5000),sep=""), position="region")) #créer une grille de box1 mètres sur box2 mètres sur la région !!! PB WITH the double argument required for box and grid). Erreur dans doGRASS(cmd, flags = flags, parameters = parameters) : Parameter <grid> does not have integer value
I've submitted a new version of spgrass6 to CRAN that handles the ambiguity inherent in the multiple=no and a keydesc count of greater than 1. When it gets through, please try. If you like, check out the source from r-spatial on sourceforge. I'd be interested to know whether this also resolves your earlier r.neighbors problem.
Roger
Does this make sense to you ? v.mkgrid is asking for an integer but the paste() has turned integer into character... and list of the 2 integers is also rejected because of the "multiple = NO" argument... I'm afraid I can't go further... Best regards Alex -----Original Message----- From: Markus Neteler <[email protected]> To: [email protected] Date: Tue, 01 Sep 2009 22:22:49 +0200 Subject: Re: [GRASS-stats] Re: [R-sig-Geo] GRASS commands (fwd) 2009/9/1 Roger Bivand <[email protected]>: > Is this a bug in the interface description of v.mkgrid? It needs > grid=rows,columns but sets multiple=NO, so wxpython fails (needing two > values but getting one, but only providing an integer entry box). It needs two values which are treated as one string, so it is correct. (E.g. r.series accepts multiple input maps which are separate tokens which required multiple=YES). ... >> grid=c(as.integer(100),as.integer(100)), box=c(5000, 5000), >> position="region")) >> returns >> Erreur dans doGRASS(cmd, flags = flags, parameters = parameters) : >> Parameter <grid> has multiple values >> >> How do I specify the two values when multiple is not allowed. I did not >> get it.... You used > c(as.integer(100),as.integer(100)) [1] 100 100 > c(5000, 5000) [1] 5000 5000 which leads to space separated values. But we want > paste(as.integer(100), as.integer(100), sep=",") [1] "100,100" > Consider the statsgrass list for use of the interface between R and GRASS, > in this case there is an interaction between a possible bug in v.mkgrid and > the parsing of its parameters. > > Since v.mkgrid does declare that grid does *not* take multiple values, the > (current) logic of doGRASS() is defeated, as it checks that the multiple > attribute if the GRASS parameter is not "NO", see > > http://trac.osgeo.org/grass/browser/grass/trunk/vector/v.mkgrid/main.c#L74 > > The discrepancy between the code and the documentation is obvious. There is no real discrepancy... Hope above comments clarify it. If not, we would need to see some debug output of doGRASS()... Markus
-- 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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