On 20/10/15 09:44, Moritz Lennert wrote:
On 19/10/15 21:16, Glynn Clements wrote:
G. Allegri wrote:
Doing a logical operation with a DCELL raster within an if(x,a) statement
produces an error: "Incorrect argument types to function bitand()".
First, you're confusing bitwise operators and logical operators. & and
| are bitwise operators, while && and || (and &&& and |||) are logical
operators.
Second, both bitwise and logical operators only work on integer
values. If you want to use floating-point values as boolean values,
you need to explicitly convert them to integers (either via int(x) or
round(x), or x==0.0, or abs(x)<1e-30, or whatever).
???
On my grass71 and grass64release, these work (using NC demo data set):
r.mapcalc "test = if(elevation == 100.0, 1)"
r.mapcalc "test = if(elevation > 100.0, 1)"
where elevation is FCELL.
Sorry, forget that. I missed the "logical" part...
Moritz
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