Re: [GRASS-user] Re: Feed and manipulate the result of "v.distance -pa" in python

2010-08-06 Thread Nikos Alexandris 
Nikos Alexandris:
> >  distances = grass.read_command("v.distance",\
> >  flags = 'pa',\
> >  _from = reference_points_map,\
> >  to = lowres_vector_grid,\
> >  column = gridcell_column,\
> >  to_column = "cat",\
> >  upload = "to_attr")

Martin Landa wrote: 
> btw, there is no need for '\' at the of the line.

Thanks, Martin. Good to know. That's my bash-habit ;-)

Nikos
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] Re: Feed and manipulate the result of "v.distance -pa" in python

2010-08-06 Thread Martin Landa 
Hi,

2010/8/6 Nikos Alexandris :
>  distances = grass.read_command("v.distance",\
>  flags = 'pa',\
>  _from = reference_points_map,\
>  to = lowres_vector_grid,\
>  column = gridcell_column,\
>  to_column = "cat",\
>  upload = "to_attr")

btw, there is no need for '\' at the of the line.

Martin

-- 
Martin Landa  * http://gama.fsv.cvut.cz/~landa
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] Re: Feed and manipulate the result of "v.distance -pa" in python

2010-08-06 Thread Nikos Alexandris 
On Wednesday 04 of August 2010 15:20:58 schorschli wrote:
> For your task the use of lists and the split tool may help.
> The different lines have are seperated by a  '\n' (which is interpreted as
> a new line). After splitting the string into a line list you can make a
> loop each item of this list. Something like this:
> 
> output='7839|16\n7839|17\n7839|22\n7839|23\n7839|24'
> 
> seccond_column_list=[]
> max_value=0
> 
> line_list=output.split('\n')
> 
> for line in line_list:
>   columns=line.split('|')
>   seccond_column_list.append(float(columns[1]))
> 
> max_value=max(seccond_column_list)
> 
> print seccond_column_list
> print max_value
> 
> 
> I may missunderstood your question but I hope this helps.

Thanks Hamish and Matthias.

Here one (more) solution:

# get distances from v.distance -pa
 distances = grass.read_command("v.distance",\
 flags = 'pa',\
 _from = reference_points_map,\
 to = lowres_vector_grid,\
 column = gridcell_column,\
 to_column = "cat",\
 upload = "to_attr")

 # get max distance
 max_distance=max([float(d.split('|')[1]) for d in distances.splitlines()
[1:]])


(Thanks to Aggelos Nikolaou for the solution. It's something trivial but when 
_not_ working all-the-time with python looks difficult in the beginning.)

Nikos
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

[GRASS-user] Re: Feed and manipulate the result of "v.distance -pa" in python

2010-08-04 Thread schorschli 

For your task the use of lists and the split tool may help.
The different lines have are seperated by a  '\n' (which is interpreted as a
new line). After splitting the string into a line list you can make a loop
each item of this list. Something like this:

output='7839|16\n7839|17\n7839|22\n7839|23\n7839|24'

seccond_column_list=[]
max_value=0

line_list=output.split('\n')

for line in line_list:
columns=line.split('|')
seccond_column_list.append(float(columns[1]))

max_value=max(seccond_column_list)

print seccond_column_list
print max_value 


I may missunderstood your question but I hope this helps.
-- 
View this message in context: 
http://osgeo-org.1803224.n2.nabble.com/Feed-and-manipulate-the-result-of-v-distance-pa-in-python-tp5371195p5372457.html
Sent from the Grass - Users mailing list archive at Nabble.com.
___
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user