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generators and endian [from thread on address@hidden
From: |
John W. Eaton |
Subject: |
generators and endian [from thread on address@hidden |
Date: |
Thu, 22 Mar 2007 22:21:04 -0400 |
On 22-Mar-2007, Paul Kienzle wrote:
|
| On Mar 22, 2007, at 1:55 PM, John W. Eaton wrote:
|
| > On 22-Mar-2007, David Bateman wrote:
| >
| > | I'd say the option 3) is probably the best, but means the old
| > generators
| > | won't generator the same sequence as previously on big-endian
| > | machines... Is this an issue?
| >
| > I think it is probably more important for Octave generate the same
| > sequence for a given seed on both big and little endian systems than
| > to preserve some old (and possibly even buggy) behavior.
|
| This presents an excellent opportunity to toss the old generators,
| at least on big-endian machines. Any reason to keep them?
Maybe we should keep a "seed" option (in addition to the new "state"
option) for old code?
| How much effort is it worth to guarantee that randn and other
| derived generators produce the same sequence? The vagaries
| of the optimizer may mean that guard bits allow one threshold
| test to pass on some versions of the compiler but not in others.
| Should we force numbers to memory to clear the guard?
I don't know. I was assuming it would be a simple change. If not,
then I don't think it is very important for the old generators.
jwe
- generators and endian [from thread on address@hidden, Paul Kienzle, 2007/03/22
- generators and endian [from thread on address@hidden,
John W. Eaton <=
- Re: generators and endian [from thread on address@hidden, David Bateman, 2007/03/23
- Re: generators and endian [from thread on address@hidden, Paul Kienzle, 2007/03/23
- Re: generators and endian [from thread on address@hidden, David Bateman, 2007/03/23
- Re: generators and endian [from thread on address@hidden, John W. Eaton, 2007/03/23
- Re: generators and endian [from thread on address@hidden, David Bateman, 2007/03/23
- Re: generators and endian [from thread on address@hidden, John W. Eaton, 2007/03/23
- Re: generators and endian [from thread on address@hidden, David Bateman, 2007/03/23