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Pi is Rotten? [message #88044]

Fri, 14 March 2014 06:17

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

Perhaps because today is Pi Day:

http://bit.ly/1lDkQi4

Andrew Cools alerts me to an IDL problem of utmost importance. I refer,
of course, to an inexplicable problem with IDL's version of Pi:

IDL> print, !dpi, format='(f0.18)'
3.1415926535897931

As everyone knows, the actual value of Pi is 3.1415926535897932. The
last digit here is a "2", not a "1".

http://bit.ly/1qCvycp

Even ExelisVis itself realizes this, and puts the proper value in the
new !Const system variable. What's up with this? Can we ever trust IDL
again?

Cheers,

David

P.S. Let's just say I'm off to get a piece of apple with my morning Joe.

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Pi is Rotten? By: David Fanning on Fri, 14 March 2014 06:17
		Re: Pi is Rotten? By: Norbert Hahn on Fri, 14 March 2014 09:08
		Re: Pi is Rotten? By: David Fanning on Fri, 14 March 2014 09:16
		Re: Pi is Rotten? By: Dick Jackson on Fri, 14 March 2014 11:30
		Re: Pi is Rotten? By: Jim Pendleton on Sun, 16 March 2014 13:10

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