[R-sig-Geo] problem saving spplot in a loop

[Henk Sierdsema]

Hi Alex,

You have to assign the plot to a temporary variable (like tmp <- spplot(...)) and then use print(tmp1) to save it in the png-file

so somethink like:

tmp <- spplot(...)
png(filename=...)
print(tmp)
dev.off()


Succes!


Henk
-------------------------


Henk Sierdsema 

SOVON Vogelonderzoek Nederland / SOVON Dutch Centre for Field Ornithology 

Rijksstraatweg 178 
6573 DG Beek-Ubbergen 
The Netherlands 
tel: +31 (0)24 6848145 
fax: +31 (0)24 6848122 




-----Oorspronkelijk bericht-----
Van: r-sig-geo-bounces at stat.math.ethz.ch
[mailto:r-sig-geo-bounces at stat.math.ethz.ch]Namens Alexandre VILLERS
Verzonden: maandag 7 december 2009 15:09
Aan: Aide R SIG GEO
Onderwerp: [R-sig-Geo] problem saving spplot in a loop


Hey,

I wrote a loop and want to save plots of multiple 
SpatialPolygonDataFrame objects with something like

png(paste("K:/Outarde/ADrien/FigTemp/PGR",l,"_",j,".png",sep=""), 
height=1000, width=2000,res=300)
b<-spplot(grTs[,c("PGRobs04","PGRobs48")], 
col.regions=palAb(30)            
dev.off()

and

png(paste("K:/Outarde/ADrien/FigTemp/Abondance",l,"_",j,".png",sep=""), 
height=1000, width=3000,res=300)
spplot(grTs[,c("ov2000","ov2004","ov2008")], 
col.regions=palAb(17),at=cutsAb)
dev.off()

When I run "manually" the code (specifying the l and j values for the 
loop), everything is fine and I get nice png files. When the code loops 
on its own, I get blank images. I suspect this is a problem of the time 
taken by spplot to build the image in time for saving in the loop.
Is this correct and how can I properly overcome this problem ?

Best regards

Alex

-- 
Alexandre Villers
PhD Candidate
AgriPop
Centre d'Etudes Biologiques de Chizé-CNRS UPR1934
79360 Beauvoir sur Niort

Phone +33 (0)5 49 09 96 13
Fax   +33 (0)5 49 09 65 26




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