[Octave-patch-tracker] [patch #9958] [octave forge](mapping) gcxgc

[Philip Nienhuis]

Follow-up Comment #22, patch #9958 (project octave):

In the mean time I played around about detecting coinciding great circles with
my idea from comment #18.
I got it working, see attached gcxgc3.m (based on your gcxgc.m version of
comment #6). Just interpret it as a proof-of-concept for now.

Turned out it isn't even necessary to compute & then compare polar axes, it
suffices to find & compare the (Lat,Lon) coordinates of the location where the
great circle tangents run exactly EW (azimuth 90 degrees).
I wish I had realized this earlier on. Very easy to grasp.

In that gcxgc3.m I've also made it return the indices of coinciding great
circle pairs, if any. A sort of Matlab extension so to speak.

I'll proceed with the version of comment #15 (your last version).

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