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Re: Zero or not?
From: |
kensmith |
Subject: |
Re: Zero or not? |
Date: |
Tue, 24 Jul 2007 06:53:07 -0700 |
User-agent: |
KMail/1.9.1 |
On Monday 23 July 2007 14:10, Miroslaw Kwasniak wrote:
[... errors in FP ....]
> > Stuff like sorting numbers by absolute value
> > can help reduce the error of the operations.
>
> This is one of methods of improvment in precission. But is very
> costly :( I made this method in one program twenty years ago ;)
>
> I can be done in octave in a simplest way:
>
> [i,i]=sort(abs(x)); s=sum(x(i));
I'm new to "octave". I'm translating from a method I use in "pascal"
Avg = sum(abs(X))/(size(X)(2)); # Figure a dividing line
Gate = Avg < abs(X); # Classify X
Total = sum(X .* Gate) + sum(X .* !Gate);
This is a lot better than the simple case and nowhere near as good as
sorting.
address@hidden
- Re: Zero or not?, (continued)
- Re: Zero or not?, Jordi GutiƩrrez Hermoso, 2007/07/21
- Re: Zero or not?, Matthias Brennwald, 2007/07/21
- Re: Zero or not?, Ben Abbott, 2007/07/21
- Re: Zero or not?, Matthias Brennwald, 2007/07/22
- Re: Zero or not?, James Sherman Jr., 2007/07/22
- Re: Zero or not?, Matthias Brennwald, 2007/07/23
- Re: Zero or not?, Francesco Potorti`, 2007/07/23
- Re: Zero or not?, James Sherman Jr., 2007/07/23
- Re: Zero or not?, Miroslaw Kwasniak, 2007/07/23
- Re: Zero or not?, Francesco Potorti`, 2007/07/24
- Re: Zero or not?,
kensmith <=
- Re: Zero or not?, Przemek Klosowski, 2007/07/24
- Re: Zero or not?, kensmith, 2007/07/24
- Re: Zero or not?, Francesco Potorti`, 2007/07/22
- Re: Zero or not?, Miroslaw Kwasniak, 2007/07/23
- Re: Zero or not?, Francesco Potorti`, 2007/07/23
- Re: Zero or not?, kensmith, 2007/07/23
- Re: Zero or not?, Przemek Klosowski, 2007/07/23
- Re: Zero or not?, Robert A. Macy, 2007/07/21
Re: Zero or not?, Bob Weigel, 2007/07/21