I'm pretty sure someone has already answered this, but cannot get my hands on the relevant mail: which grass python lib function should I use and how in order to be able to feed r.recode, r.reclass, r.colors, etc rules on the fly ?
Moritz
Moritz Lennert wrote:
I'm pretty sure someone has already answered this, but cannot get my
hands on the relevant mail: which grass python lib function should I use
and how in order to be able to feed r.recode, r.reclass, r.colors, etc
rules on the fly ?
feed_command() or write_command().
The former returns a Popen object, so you can write to its .stdin
member. You need to call p.stdin.close() and p.wait() once you're
done.
The latter accepts the input as a string via the stdin= parameter,
waits for completion and returns the exit status.
--
Glynn Clements <glynn@gclements.plus.com>
On 01/12/11 07:40, Glynn Clements wrote:
Moritz Lennert wrote:
I'm pretty sure someone has already answered this, but cannot get my
hands on the relevant mail: which grass python lib function should I use
and how in order to be able to feed r.recode, r.reclass, r.colors, etc
rules on the fly ?feed_command() or write_command().
The former returns a Popen object, so you can write to its .stdin
member. You need to call p.stdin.close() and p.wait() once you're
done.The latter accepts the input as a string via the stdin= parameter,
waits for completion and returns the exit status.
Thanks, write_command() is perfect for me !
Just one question using it with r.recode:
When I use it without a rules parameter it works, but when I use it with rules='-' it gives me 'ERROR :Unable to open file <->'. Is this expected behaviour ?
Moritz
Moritz wrote:
Just one question using it with r.recode:
When I use it without a rules parameter it works, but when
I use it with
rules='-' it gives me 'ERROR :Unable to open file
<->'. Is this expected behaviour ?
it is a bug. apparently the option description got backported
from trunk but the actual code to check for the '-' didn't (yet).
Hamish
Moritz wrote:
> Just one question using it with r.recode:
>
> When I use it without a rules parameter it works, but when
> I use it with rules='-' it gives me 'ERROR :Unable to open file
> <->'. Is this expected behaviour ?it is a bug. apparently the option description got backported
from trunk but the actual code to check for the '-' didn't
(yet).
r.recode fixed in svn.
There are a number of other changes to backport for r.reclass, so for that
one I'll hold off for 6.4.3 then merge them in order.
Hamish