Can someone tell me why the following generates an error? The 'overlay'
description in the 'raster' package suggests the single-layer object should
recycle as needed...
Thanks!
Kevin
> r <- raster(ncol=10, nrow=10)
> r <- init(r, fun=runif)
> stack_r=stack(r,r)
> overlay(stack_r,r,fun=sum)
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "overlay", for signature
"RasterStack", "RasterLayer"
Seems to me that the command above should be able to replicate:
> stack_r+r
class : RasterBrick
filename :
nlayers : 2
nrow : 10
ncol : 10
ncell : 100
projection : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
min value : 0.011 0.011
max value : 2 2
extent : -180, 180, -90, 90 (xmin, xmax, ymin, ymax)
resolution : 36, 18 (x, y)
I need single-layer objects used as arguments within 'overlay' to recycle for
more complex functions that include raster stacks...
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