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Re: Diagonal v. sparse matrices
From: |
Jaroslav Hajek |
Subject: |
Re: Diagonal v. sparse matrices |
Date: |
Wed, 4 Mar 2009 22:02:46 +0100 |
On Wed, Mar 4, 2009 at 9:47 PM, Jason Riedy <address@hidden> wrote:
> And Jaroslav Hajek writes:
>> What's wrong with it? Besides, in current tip you get
>> P =
>> Permutation Matrix
>> 0 1 1
>> 1 0 1
>> 1 1 0
>
> It should be
> 1 0 0
> 0 1 0
> 0 0 1
> to match traditional mathematical notation.
>
Oops, I see. I must be getting blind. That's definitely a bug. I must
have screwed something up.
>> What exactly are you trying to achieve? Remember that most sparse vs.
>> diag ops return a full matrix for compatibility with matlab, and
>> changing that would be a significant breach.
>
> I don't care about Matlab(TM). I don't use it. They don't want
> me as a user, personally or as a class; they're targeting a
> different market now.
>
>> That's what I did for the mx-op-defs and MArray-defs. I think there
>> was some speed up, but still not what I was hoping for. So I guess C++
>> is just slow, and we need to live with that.
>
> I'll look into that. I'd hope it'd break some of the dependency
> chains. It's the *re*building of everything that's killing me.
>
Do you have a multicore machine? On multiple cores, it's not that bad.
Thank heavens for make -j :)
--
RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz
- Diagonal v. sparse matrices [was Re: deprecated functions], (continued)
- Diagonal v. sparse matrices [was Re: deprecated functions], Jason Riedy, 2009/03/04
- Diagonal v. sparse matrices [was Re: deprecated functions], John W. Eaton, 2009/03/04
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], Jaroslav Hajek, 2009/03/04
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], John W. Eaton, 2009/03/04
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], Jaroslav Hajek, 2009/03/04
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], John W. Eaton, 2009/03/04
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], Jaroslav Hajek, 2009/03/05
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], John W. Eaton, 2009/03/05
- Re: Diagonal v. sparse matrices [was Re: deprecated functions], Jaroslav Hajek, 2009/03/04
- Re: Diagonal v. sparse matrices, Jason Riedy, 2009/03/04
- Re: Diagonal v. sparse matrices,
Jaroslav Hajek <=
- Re: Diagonal v. sparse matrices, Jaroslav Hajek, 2009/03/04
- Re: deprecated functions, Jaroslav Hajek, 2009/03/04
- Re: deprecated functions, John W. Eaton, 2009/03/04
- Re: deprecated functions, Jaroslav Hajek, 2009/03/04
- Re: deprecated functions, John W. Eaton, 2009/03/04
- Re: deprecated functions, Jaroslav Hajek, 2009/03/04
- Re: deprecated functions, John W. Eaton, 2009/03/04
- Re: deprecated functions, Jason Riedy, 2009/03/04
- Re: deprecated functions, Jaroslav Hajek, 2009/03/04
- Re: deprecated functions, Jason Riedy, 2009/03/04