[R-sig-Geo] syntax problem with r.mapcalculator

[Aubrey Moore]

  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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