Thanks, Roger
Your suggested "incantation" is the correct syntax for Windows.
execGRASS("r.mapcalculator", flags = c("overwrite"),
parameters=list(outfile="result", amap="ddev",
formula="\"if(A<0,0,A)\""))
- Aubrey
On 10/5/2010 7:56 PM, Aubrey Moore wrote:
I created a raster map, "R20101001", using v.surf.rst. The
interpolation overshoots and dips below zero in a few areas. I'd like
to use r.mapcalculator, called from spgrass6, to replace all negative
values with zeros. But I can't seem to get the syntax right. The
following fails and produces the error message: "The system cannot
find the file specified."
execGRASS("r.mapcalculator", flags = c("overwrite"),
parameters=list(outfile="result", amap="R20100101",
formula='if(A<0,0,A)'))
I would appreciate it if anyone can spot the mistake.
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