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

[Philip Nienhuis]

Follow-up Comment #2, patch #9958 (project octave):

For a check on two identical great circles, try:

az = <any number in open interval (-90 ... 90)>
[lat, lon] = gcxgc (0, 0, az, 0, 180, -az)

Matlab r2014a gives:

>> format compact
>> [lat, lon] = gcxgc (0, 0, 45, 0, 180, -45)
warning: Non-unique intersection.
> In scxsc at 80
  In gcxgc at 63
lat = 
   NaN   NaN
lon = 
   NaN   NaN


The answers from your gcxgc seem correct but not unique. It would be nice if
we could get full Matlab compatibility.

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