[ADMB Users] Using asin with df1b2variables

[Ben Stevenson]

Hi Dave,

You're right, there is nothing wrong with asin(). It performs exactly as
one would expect, I was not suggesting otherwise. The problem still remains
of calculating a bearing in the range (0, 2*pi) between two locations that
are defined by df1b2variables. The way I describe above appears to work but
just seems really messy. Good point about an animal moving exactly north,
though, I hadn't thought of that. Presumably so long as I keep the start
values away from a north bearing I should be OK; I'd imagine it'd be very
bad luck for a bearing to be allocated as exactly north during the
optimisation.

Cheers,

Ben
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