[Issue 1877] Errors in the documentation of std.math.atan2

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1877





------- Comment #1 from clugdbug at yahoo.com.au  2008-02-29 02:15 -------
(In reply to comment #0)
> First of all, the doc states "Calculates the arc tangent of y / x, returning a
> value ranging from -π/2 to π/2." which should be "..from -π to π.", as is
> shown in the table.
> 
> Then, there are a couple of inconsistencies in the "Special Values" table:
> "±0.0 ±0.0 ±0.0" should be "±0.0 +0.0 ±0.0",
> "<0.0 ±0.0 π/2" should be "<0.0 ±0.0 -π/2",
> ">0.0 ∞ ±0.0" should be "anything ∞ ±0.0",
> ">0.0 -∞ ±π" should be "anything -∞ ±π".
> 

You're correct for the first three, but not for the last two. atan2(NaN, inf)
is NaN, not +-0. Also atan2(inf, inf) is pi/4.


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