Hi,
I am able to set up functions and apply them to a raster dataset in
parallel using the rasterEngine function of the spatial.tools package, but
only if the function performs just a numerical operation on the raster.
When I try to incorporate a function from the raster package, such as
clump(), the rasterEngine fails and I get an error:

> Error in (function (classes, fdef, mtable): unable to find an inherited
method for function ‘clump’ for signature ‘"array"’

If I change "chunk_format" to "raster" in the rasterEngine function, then i
get an error:

> chunk processing units require array vector outputs.  Please check your
function.

1) Am I doing doing something wrong, or does this particular function just
not work with rasterEngine?

2) If it is the latter, which of the raster package functions are available
for use in parallel processing with rasterEngine?

Thank you.
-Dave

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