Hi folks,
I have a bit of a problem with a pretty complicated mathematical
expression. Basically, I'm trying to determine the initial heading
between two points on the globe using latitude and longitude of the
two points. I already know the distance between the two ($miles).
Here's the expression:
$Hdg=2*M_PI-acos((sin($lat2)-sin($lat1)*cos($miles))/(sin($miles)*cos($lat1)));
When I echo $Hdg, I see:
-1.#IND
If the expression was working, I should see something like 134.9 for
the following latitude/longitude combinations:
$lat1 = 33.9780761
$lon1 = -83.9623772
$lat2 = 32.1950556
$lon2 = -81.8695556
$miles = 172.7381359
I can't find any references to what #IND means, so if anyone out there
has any ideas, I'd be grateful.
-JS
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