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

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

[Martin Landa]

Hi,

2010/8/6 Nikos Alexandris nikos.alexand...@felis.uni-freiburg.de:
  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 landa.martin gmail.com * http://gama.fsv.cvut.cz/~landa
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Re: [GRASS-user] Re: Feed and manipulate the result of v.distance -pa in python

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

[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.
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