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Re: randomn problem [message #52948]

Mon, 12 March 2007 09:17

Ben Panter
Messages: 102
Registered: July 2003

Senior Member

Nigel Wade wrote:

> Something also changed between IDL 6.1 and IDL 6.2:
> Maybe the algorithm has been changed to one which propogates more round-off
> error?

It would seem that it didn't get better in 6.3:

IDL> print, !version
{ x86 linux unix linux 6.3 Mar 23 2006 32 64}

IDL> print, stddev(randomn(seed, 1e8))
% Compiled module: STDDEV.
0.852648

IDL> print, stddev(randomn(seed, 1e8, /double) )
1.0000419

Ben

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Ben Panter, Edinburgh, UK.
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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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