gdistance rev. 219, available from R-Forge, contains a patch that should make geoCorrection faster.
Use this command to install it.
install.packages("gdistance", repos="http://R-Forge.R-project.org")

Jacob


________________________________
 From: "Bastien.Ferland-Raymond@mrn.gouv.qc.ca" <Bastien.Ferland-Raymond@mrn.gouv.qc.ca>
To: r-sig-geo@r-project.org 
Sent: Thursday, 29 November 2012, 13:31
Subject: [R-sig-Geo] Problem with update gdistance 1.1-3

Hello,

I want to expose a problem I am now facing with the gdistance package and the geoCorrection() function.

I have a code I haven't been using since March, and now, after updating R to 2.15.2 and the package gdistance to 1.1-3 from 1.1-2, the geoCorrection() function doesn't work.  It simply runs forever without giving any result.

My code is fine, as I tested it with my old computer still running R 2.15.0 and gdistance 1.1-2 and it does the task in 15 seconds.  The problem is really with the 1.1-3 version of gdistance.

## here a simple example of my code.
##  download le Rdata: https://www.dropbox.com/s/mo51vgft3fsmm5y/transi.RDATA

load("transi.Rdata")
library(gdistance)

transi <- transition(ras,transitionFunction=max, directions=8,symm=T) transi <- geoCorrection(transi)

> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=French_Canada.1252  LC_CTYPE=French_Canada.1252 [3] LC_MONETARY=French_Canada.1252 LC_NUMERIC=C [5] LC_TIME=French_Canada.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] gdistance_1.1-3 Matrix_1.0-9    lattice_0.20-10 igraph0_0.5.5-3
[5] raster_2.0-31   sp_1.0-2

loaded via a namespace (and not attached):
[1] grid_2.15.2  tools_2.15.2

##########


I've tried it on win XP and windows 7,  32 and 64 bits, still the same problem.

I would be happy if somebody could fix it.

Thanks

Bastien Ferland-Raymond, M.Sc. Stat., M.Sc. Biol.
Division des orientations et projets spéciaux
Direction des inventaires forestiers
Ministère des Ressources naturelles

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