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Re: randomn problem [message #52952 is a reply to message #52951]

Mon, 12 March 2007 01:03

Ingo von Borstel
Messages: 54
Registered: September 2006

Member

Hi,

> 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

IDL> print, !version
{ x86 linux unix linux 6.1 Jul 14 2004 32 64}
IDL> print, stddev(randomn(seed,1e7))
1.00015
IDL> print, stddev(randomn(seed,1e7))
1.00013
IDL> print, stddev(randomn(seed,1e7))
0.999803
IDL> print, stddev(randomn(seed,1e7))
0.999735
IDL> print, stddev(randomn(seed,1e7))
0.999860
IDL> print, stddev(randomn(seed,1e7))
0.999887
IDL> print, stddev(randomn(seed,1e7))
1.00021
IDL> print, stddev(randomn(seed,1e7))
0.999798
IDL> print, stddev(randomn(seed,1e7))
1.00019

I cannot test it reasonably with 10^8 elements, either.

Sorry, no idea.

Best regards,
Ingo

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Ingo von Borstel <newsgroups@planetmaker.de>
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[Message index]

		Re: randomn problem By: Ben Panter on Mon, 12 March 2007 09:17
		Re: randomn problem By: Nigel Wade on Mon, 12 March 2007 09:07
		Re: randomn problem By: Paolo Grigis on Mon, 12 March 2007 02:07
		Re: randomn problem By: Ingo von Borstel on Mon, 12 March 2007 01:03
		Re: randomn problem By: David Fanning on Sun, 11 March 2007 18:10
		Re: randomn problem By: askemer on Sun, 11 March 2007 16:04
		Re: randomn problem By: David Fanning on Sun, 11 March 2007 12:41
		Re: randomn problem By: JD Smith on Tue, 13 March 2007 09:25
		Re: randomn problem By: Paolo Grigis on Tue, 13 March 2007 04:03

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