| randomn problem [message #52956] |
Sun, 11 March 2007 11:24  |
askemer
Messages: 4
Registered: March 2007
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Junior Member |
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Hi all,
I was playing around with randomn and noticed some weird behavior:
IDL> print, stddev(randomn(seed, 1e7))
I consistently get back numbers around ~0.992. I've tried it on a
different computer, and the result was not exactly the same, but
similar. If I change 1e7 to 1e8, the problem gets worse, and I get
~0.853. I've tried the syntax with floats, integers, and longs, and I
still get the same answer. Does anyone know what could be going on?
-Andy
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| Re: randomn problem [message #53019 is a reply to message #52956] |
Tue, 13 March 2007 11:15  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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askemer@gmail.com writes:
> Thanks for all the help. It's still curious that older versions of
> IDL seem to do better (ie default use double), and that David
> Fanning's windows 6.3 works while the linux versions don't.
I wouldn't read TOO much into that! :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: randomn problem [message #53020 is a reply to message #52956] |
Tue, 13 March 2007 10:05 |
askemer
Messages: 4
Registered: March 2007
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Junior Member |
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Thanks for all the help. It's still curious that older versions of
IDL seem to do better (ie default use double), and that David
Fanning's windows 6.3 works while the linux versions don't.
-Andy
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