ArcTan[-Infinity, y] always returning 0?
- To: mathgroup at smc.vnet.net
- Subject: [mg69839] ArcTan[-Infinity, y] always returning 0?
- From: exogen at gmail.com
- Date: Mon, 25 Sep 2006 03:52:56 -0400 (EDT)
I'm a little confused about the output I'm getting from ArcTan.
According to this page about special values for ArcTan:
ArcTan[-Infinity, y] == (2 UnitStep[Re[y]] - 1) Pi
However, when I use ArcTan where x is -Infinity, it always returns 0:
Shouldn't this return Pi?
The supposed equivalence returns the expected value:
(2 UnitStep[Re]-1) Pi
Anyone know what's going on?
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