Elaine:
Based on the error message (cannot allocate vector of size 121.8 Mb), it
is very possibly you have way too many cases in your data set. A
potential solution would be randomly sample your dataset to get a
representative sample set and run the spatial regression, or you can
always try a computer with more physic memory, or try memory.limit() to
manually allocate more memories. See ?memory.limit for more details.
Hope this helps.
Cheers,
Dr. Danlin Yu
elaine kuo ??:
Dear List,
I encountered an error message when trying to use Chebyshev as method for
SAR.
Please kindly help and thanks.
package spdep was updated on 07162010
system: windows vista home 32-bit
R version 2.10.0 (20091026)
Elaine
Code
library(ncf)
library(spdep)
# Define coordinates, neighbours, and spatial weights
coords<-cbind(datam$lat,datam$lon)
coords<-as.matrix(coords)
#Define neighbourhood (here distance 1.5)
nb10<-dnearneigh(coords,0,9)
nb10.w<-nb2listw(nb10, glist=NULL, style="W", zero.policy=FALSE)
sem.nb10.w <-
errorsarlm(datam$WinterM_ratio~datam$topo_mean+datam$coast+datam$prec_max
+datam$temp_min+datam$evi_min, listw=nb10.w,
method="Chebyshev",tol.solve=1.0e-17)
error: cannot allocate vector of size 121.8 Mb
sem.nb10.w <-
errorsarlm(datam$WinterM_ratio~datam$topo_mean+datam$coast+datam$prec_max
+datam$temp_min+datam$evi_min, listw=nb10.w,
method="Chebyshev",zero.policy=TRUE,tol.solve=1.0e-17)
error in switch(Generic, `+` = , `-` = { :
Cholmod error 'out of memory' at file:../Core/cholmod_memory.c, line 148
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--
___________________________________________
Danlin Yu, Ph.D.
Associate Professor of GIS and Urban Geography
Department of Earth & Environmental Studies
Montclair State University
Montclair, NJ, 07043
Tel: 973-655-4313
Fax: 973-655-4072
email: y...@mail.montclair.edu
webpage: csam.montclair.edu/~yu
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