Package: octave-forge
Version: 2006.07.09+dfsg1-8
Severity: normal
Tags: patch
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The calculation in mapping/azimuth.m in both the 2.1 and 2.9 branches of
octave-forge gives incorrect values. A correct version of the
calculation is given at http://williams.best.vwh.net/avform.htm#Crs
Instead of the current calculation:
< az = rad2deg(acot((sin(a) * cot(b) - cos(a) * cos(C)) / \
< sin(C)));
the calculation should be:
> az=rad2deg(mod(atan2(sin(C)*sin(b), \
>sin(a)*cos(b)-cos(a)*sin(b)*cos(C)),\
> 2*pi));
If azimuth.m is actually doing the right thing, then perhaps its
documentation needs changing - as I read it, it calculates the angle of
the great circle between the two points. This is not what the current
calculation does.
Apologies if I've got anything wrong - I'm fairly new to spherical
geometry - do email to discuss this if necessary.
-- System Information:
Debian Release: 4.0
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.17.061206.1
Locale: LANG=en_GB, LC_CTYPE=en_GB (charmap=ISO-8859-1)
Versions of packages octave-forge depends on:
ii octave2.1-forge 2006.03.17+dfsg1-3 Contributed functions from the
GNU
octave-forge recommends no packages.
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