[R-sig-Geo] gpclib problem with as.polygonal in spatstat ?

Marcelino de la Cruz marcelino.delacruz at upm.es
Fri Dec 3 13:59:50 CET 2010

Hi Alexander,
Try this:

    m<- as.mask(letterR, dimyx=32)
    p<- as.polygonal(m)



Con fecha 3/12/2010, "Alexandre Villers" <villers.alexandre at gmail.com>

>Good afternoon
>I'm trying to convert a mask to a polygonal windows with spatstat.
>However, despite, the gpclibPermit() command, I get this error message:
>Warning message:
>In as.polygonal(m) :
>   Can't convert mask to polygon: gpclib is disabled/unavailable
>While trying this
>    m<- as.mask(letterR, dimyx=32)
>    p<- as.polygonal(m)
>>  sessionInfo()
>R version 2.11.1 (2010-05-31)
>[1] LC_COLLATE=English_United Kingdom.1252  LC_CTYPE=English_United Kingdom.1252    LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C                            LC_TIME=English_United Kingdom.1252
>attached base packages:
>[1] stats     graphics  grDevices utils     datasets  methods   base
>other attached packages:
>  [1] gdata_2.8.1     gpclib_1.5-1    maptools_0.7-38 lattice_0.18-8  foreign_0.8-40  rgdal_0.6-29    sp_0.9-72       spatstat_1.21-2 deldir_0.0-13   mgcv_1.6-2
>loaded via a namespace (and not attached):
>[1] grid_2.11.1        gtools_2.6.2       Matrix_0.999375-39 nlme_3.1-96        tools_2.11.1
>Thanks for any hint
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