I am trying to estimate random walk resistance distances with
commuteDistance() function from the package gdistance. However, with some
of my rasters I've encountered this error:
Error in LU.dgC(a) : cs_lu(A) failed: near-singular A (or out of memory)
Sometimes it happens right away after I hit enter, in others the command
will run for along time (ca. 30 min) and hog up > 3 GB of memory, then halt
with this error. I'm wondering what may be causing the error?
I am building my transition objects with:
tr <- transition(ras, function(x) 1/mean(x), 8)
"ras" would be an irregularly shaped raster with resistance values ranging
from 1 to 10. The raster's CRS is "+proj=utm +zone=11 ellps=WGS84
Any help is appreciated!
Santiago Sanchez-Ramirez, PhD
Ecology and Evolutionary Biology
University of Toronto