Slime wrote:
> You can try replacing atan(y/x) by atan2(y,x) which avoids the division by
> zero and also avoids the problem that 1/2 is equal to -1/-2 and thereby
> gives more useful results for all values of x and y.

Whee, that fixed it.  Thanks!

-- 
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean

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