Hi! I need to convert the following bash-one-liner:
v.distance --q -pa from=ref_points to=coi_points upload=cat column=anycol | cut -d"|" -f2 | sort -nu | tail -1 into python. My unsolved problem is that "v.distance -pa" returns for example thousands of lines in the following format: ... 7839|16 7839|17 7839|22 7839|23 7839|24 Reading the main command in python is not the problem (although I am a bit confused between grass.pipe, grass.feed, grass.read). Are there any examples (scripts in grass trunk maybe?) to follow in order to split the output, keep the second "column", sort and keep the maximum? Actually the "split" is what worries me most. I 've been looking for quite some time to find something that gives me a strait answer but no luck yet. The idea is to feed later on v.what.vect with a "dmax=" as this seems to reduce the eXtremely slow "v.distance" process as suggested by MoritzL in [1] ("v.distance" is running for 2 days here over large files[*]!). I timed two different versions of v.what.vect (with and without "dmax=") and it seems to make a difference (tested however in small spearfish vector data). All this as part of a horrible script of mine [2]. I feel however that this fits as an enhancement to "v.what.vect" itself. Regards, Nikos --- [1] <http://lists.osgeo.org/pipermail/grass-user/2009-May/050330.html> [*] e.g. first result after >10h: Finding nearest lines... Finding nearest areas... 404347 categories read from the map 404347 categories exist in the table 404347 categories read from the map exist in the table 404347 records updated ... [2] Script "pareto_3" within the tarred attached file in <http://trac.osgeo.org/grass/ticket/804> _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user