[GRASSLIST:4900] converting null values, is this a bug
Thomas Dewez
thomas.dewez at brunel.ac.uk
Thu Nov 7 08:15:17 EST 2002
Dear all,
I am trying to convert null values to 0 with r.mapcalc. Did I bump into a bug?
rast is a raster containing 1 and null() data, with
r.mapcalc rast.nonull = "if(rast==null(),0,1)"
rast.nonull has 0 categories and:
Range of data: min = -2147483648 max = -2147483648
If I use instead:
r.mapcalc rast.nonull = "if(isnull(rast),0,1)"
the values are then correctly converted from null() to 0.
Why is this?
Best,
Thomas
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