[GRASS-user] scripting mapcalc
glynn at gclements.plus.com
Thu Mar 5 23:37:39 EST 2009
Nikos Alexandris wrote:
> Try this:
> r.mapcalc river="if(river==$old, $new, null())"
Note that this won't work in 7.0, where r.mapcalc uses the parser. It
will complain that r.mapcalc doesn't have a river=... option.
For portability, always:
1. quote the entire expression, and
2. insert a space before the first = sign, e.g.:
r.mapcalc "river = if(river==$old, $new, null())"
This will work with all versions of r.mapcalc.
Glynn Clements <glynn at gclements.plus.com>
More information about the grass-user