[GRASS5] [bug #3886] (grass) upload loop error in v.distance

GRASS GIS GRASS GIS developer
1

this bug's URL: http://intevation.de/rt/webrt?serial_num=3886
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Subject: upload loop error in v.distance

Platform: Mac OSX
grass obtained from: Other (CDROM etc)
grass binary for platform: Downloaded precompiled Binaries
GRASS Version: 6.1cvs (Moretti)

When running:

v.distance -a kenpoints to=kenbnd table=bdist column=distance upload=dist

the output dbf reads as follows:

from_cat distance
5 0
5 342
5 284
2 156
2 0
2 301
8 12
8 19
8 0
4 956
...and so on

Notice how a zero value is written in the index position of the given object - i.e. first for the first
point listed, second for the second, etc. This causes problems when doing various statistical
manipulations with the data. A fix would be a big help!

-------------------------------------------- Managed by Request Tracker

2

You've set the -a flag, which asks v.distance to computer the distance from
a point to ALL points in the file. The 0 values represent the distance from
a point to itself.

This is pretty easy to get rid of in any kind of dbms or stat program--or
even with shell scripting commands. However, it is also helpful marking when
distances to a new point is being measured. To see an example of how this
can be used, look at the v.lda script I did (on the WIKI) to compute local
density analysis scores.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton

From: Request Tracker <grass-bugs@intevation.de>
Reply-To: Request Tracker <grass-bugs@intevation.de>
Date: Wed, 7 Dec 2005 15:37:11 +0100 (CET)
To: <grass5@grass.itc.it>
Subject: [GRASS5] [bug #3886] (grass) upload loop error in v.distance

this bug's URL: http://intevation.de/rt/webrt?serial_num=3886
-------------------------------------------------------------------------

Subject: upload loop error in v.distance

Platform: Mac OSX
grass obtained from: Other (CDROM etc)
grass binary for platform: Downloaded precompiled Binaries
GRASS Version: 6.1cvs (Moretti)

When running:

v.distance -a kenpoints to=kenbnd table=bdist column=distance upload=dist

the output dbf reads as follows:

from_cat distance
5 0
5 342
5 284
2 156
2 0
2 301
8 12
8 19
8 0
4 956
...and so on

Notice how a zero value is written in the index position of the given object -
i.e. first for the first
point listed, second for the second, etc. This causes problems when doing
various statistical
manipulations with the data. A fix would be a big help!

-------------------------------------------- Managed by Request Tracker