I've uploaded a C code on the WIKI - azimuth2.c
http://grass.gdf-hannover.de/twiki/bin/view/GRASS/GrassAddOns
http://www.igc.usp.br/pessoais/guano/downloads/azimuth2.c
# azimuth2.c is a small C programm to calculate the azimuth and length
of vector lines exported by GRASS-GIS as ASCII files (like this:
v.out.ascii input=vector output=ascii format=standard). It is useful
for create rose diagrams of lineament maps. Improvements on the
original code after suggestions by Örs Téglásy, Hungary.
--
+-----------------------------------------------------------+
Carlos Henrique Grohmann - Guano
Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
Linux User #89721 - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke