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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