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ATAN inconsistencies [message #17729]

Fri, 12 November 1999 00:00

bowman
Messages: 121
Registered: September 1991

Senior Member

Here's a platform dependency that took me quite a while to track down.

The SGI (IRIX) version of IDL returns 0.0 when you try to take the
arctan(0/0). The Alpha version (properly) returns a NaN.

Ken Bowman

IDL Version 5.1 (IRIX mipseb). Research Systems, Inc.
IDL> print, atan(0.0, 0.0)
0.00000

IDL Version 5.1 (OSF alpha). Research Systems, Inc.
IDL> print, atan(0.0, 0.0)
NaNQ
% Program caused arithmetic error: Floating illegal operand

--
Dr. Kenneth P. Bowman, Professor 409-862-4060
Department of Meteorology 409-862-4466 fax
Texas A&M University bowmanATcsrp.tamu.edu
College Station, TX 77843-3150 Replace AT with @

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[Message index]

		ATAN inconsistencies By: bowman on Fri, 12 November 1999 00:00
		Re: ATAN inconsistencies By: bowman on Mon, 15 November 1999 00:00
		Re: ATAN inconsistencies By: Michael Werger on Mon, 15 November 1999 00:00

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