[R-sig-Geo] Issue with as.polygonal (gpclib disabled?)

["José M. Blanco Moreno"]

Oops, sorry about that, I did not read the start-up message.
Thanks.
José M.

Al 29/01/2011 0:11, En/na Rolf Turner ha escrit:
>
> Try setting:
>
>     spatstat.options(gpclib=TRUE)
>
> You would have found out about this if you'd done
>
>     licence.polygons()
>
> as the start-up message from spatstat suggests.
>
>     cheers,
>
>         Rolf Turner
>
> P. S.  The help on spatstat.options() says that gpclib defaults
> to TRUE.  This is an error.  It now defaults to FALSE.  We will
> fix this glitch in the help in the next release.
>
>         R. T.
>
> On 29/01/2011, at 7:05 AM, José M. Blanco Moreno wrote:
>
>> Dear R users,
>> I have been trying to convert a mask owin object (generated by dilation)
>> to a polygonal owin, but I am facing the following error message, and I
>> have not been able to find the solution, neither among the
>> documentation, nor in the mailing lists. Any hint? I know that some
>> packages (one package, perhaps) have changed recently (months ago) their
>> default behaviour with regards to gpclib, and I wonder if spatstats is
>> one of these.
>> Thank you in advance,
>> José M.
>>
>> ##############################
>>> library(spatstat); library(gpclib)
>>
>>> pins <- cbind(x=rnorm(60),y=rnorm(60))
>>
>>> pins <- as.data.frame(pins)
>>
>>> pins.owin <- owin(poly=pins[rev(chull(pins)),])
>>
>>> pins.dil <- dilation(pins.owin,r=0.25)
>>
>>> pins.dil <- simplify.owin(dilation(pins.owin,r=0.25))
>> # Warning message:
>> # In as.polygonal(W) :
>> #   Can't convert mask to polygon: gpclib is disabled/unavailable
>>
>>> perimeter(pins.dil)
>> # Error in as.psp.owin(p) : x is a mask
>> # In addition: Warning messages:
>> # 1: In as.polygonal(w) :
>> #   Can't convert mask to polygon: gpclib is disabled/unavailable
>> # 2: In as.polygonal(W) :
>> #  Can't convert mask to polygon: gpclib is disabled/unavailable
>>
>> ##############################
>> ## However I can execute the following example from gpclib
>>> holepoly <- read.polyfile(system.file("poly-ex/hole-poly.txt", 
>>> package =
>> + "gpclib"), nohole = FALSE)
>>
>>> area.poly(holepoly)
>>
>>> sessionInfo()
>> R version 2.11.0 (2010-04-22)
>> i386-pc-mingw32
>>
>> locale:
>> [1] LC_COLLATE=Spanish_Spain.1252  LC_CTYPE=Spanish_Spain.1252
>> [3] LC_MONETARY=Spanish_Spain.1252 LC_NUMERIC=C
>> [5] LC_TIME=Spanish_Spain.1252
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] gpclib_1.5-1    spatstat_1.21-0 deldir_0.0-12   mgcv_1.7-1
>>
>> loaded via a namespace (and not attached):
>> [1] grid_2.11.0        lattice_0.19-13    Matrix_0.999375-44 nlme_3.1-97
>> [5] tools_2.11.0
>>
>> -- 
>> ---------------------------------------
>> José M. Blanco-Moreno
>>
>> Dept. de Biologia Vegetal (Botànica)
>> Facultat de Biologia
>> Universitat de Barcelona
>> Av. Diagonal 645
>> 08028 Barcelona
>> SPAIN
>> ---------------------------------------
>>
>> phone: (+34) 934 039 863
>> fax: (+34) 934 112 842
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>

-- 
---------------------------------------
José M. Blanco-Moreno

Dept. de Biologia Vegetal (Botànica)
Facultat de Biologia
Universitat de Barcelona
Av. Diagonal 645
08028 Barcelona
SPAIN
---------------------------------------

phone: (+34) 934 039 863
fax: (+34) 934 112 842