[GRASS-user] r.mapcalc question

[Achim Kisseler]

I see,

so variables are functions in this case.

I've been searching for a while, but I cannot find any tool like grasss 
r.mapcalc that is a bit more flexible, eg. that can handle recursive tasks.

Thanks a lot,
Achim

Marco Lechner - FOSSGIS e.V. schrieb:
> Hi Achim,
> 
> the neighborhood modifier doesn't seem to accept functions (you also
> could try rand(), ...)
> 
> Marco
> 
> Achim Kisseler schrieb:
>> Hello grass-users,
>>
>> I have a problem running a r.mapcalc procedure:
>>
>> given two maps
>> dir_x,
>> dir_y
>>
>> with 0,1,-1 entries
>>
>> I want to run:
>>
>> r.mapcalc "the_map=if(isnull(the_map),the_map[dir_x,dir_y],null())"
>>
>> in order to make a r.water.outlet on many many areas at the same time.
>>
>> The error I get is:
>> syntax error, unexpected NAME, expecting INTEGER or '-'
>>
>> why does dir_x/dir_y does not return an integer here? Using int(dir_x)
>> also does not work.
>>
>> Until now I use a r.mapcalc command with many "if", checking the
>> direction of every pixel every time. But this is quite slow.
>>
>> Achim
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> 
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