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[Octave-bug-tracker] [bug #52342] vecnorm command
From: |
Rik |
Subject: |
[Octave-bug-tracker] [bug #52342] vecnorm command |
Date: |
Thu, 9 Nov 2017 01:00:28 -0500 (EST) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0 |
Update of bug #52342 (project octave):
Status: Patch Submitted => Fixed
Open/Closed: Open => Closed
_______________________________________________________
Follow-up Comment #10:
I checked in a patch here
http://hg.savannah.gnu.org/hgweb/octave/rev/3d96400df713.
I added validation for the dimension argument, and added more complete code to
detect the first non-singleton dimension. I also added a separate
TeX-formatted definition of the p-norm to the docstring so that it appears
nicely in the Octave Manual.
In terms of performance, I found for the case of n == 2 that using sumsq()
resulted in a 15X speed-up over abs(). This is much faster than using the
vectorized real^2 + imag^2 as well. Finally, the vectorized code seems to
outperform abs() when p is evenly divisble by 2. So I split the generic
calculation based on whether p is even or odd and use vectorized cod or abs()
appropriately.
Marking as fixed and closing report.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?52342>
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- [Octave-bug-tracker] [bug #52342] vecnorm command, (continued)
- [Octave-bug-tracker] [bug #52342] vecnorm command, Marco Caliari, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, CH, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, Marco Caliari, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, CH, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, Marco Caliari, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, CH, 2017/11/06
- [Octave-bug-tracker] [bug #52342] vecnorm command, Rik, 2017/11/07
- [Octave-bug-tracker] [bug #52342] vecnorm command, Rik, 2017/11/07
- [Octave-bug-tracker] [bug #52342] vecnorm command, Marco Caliari, 2017/11/07
- [Octave-bug-tracker] [bug #52342] vecnorm command, Marco Caliari, 2017/11/08
- [Octave-bug-tracker] [bug #52342] vecnorm command,
Rik <=