Re: Memory Allocation, Plotting

[Kai Habel]

Thomas Viehmann wrote:
> 
> Hi,
> 
> I'm using "debianized" Octave 2.1.31 and encountered two problems:
> 1. How can I change the labels "line x" in my plots?
> 2. I've tried a "diag(x)" with a 10000 item vector (yes, that
>    was part of a somewhat awkward attempt to avoid for loops)
>    which resulted in (of course) an out-of-memory error. So the
> questions
>    that I derived are
>    - for my concrete problem: Is there an elegant way of
>      calculating diag(x)*y with x ŠÜin R^n, y ŠÜin R^{n*m}?
>    - for the diag problem in a more general way: are there
>      routines/plans to implement routines for sparse matrices?
> 

Hello Thomas,

1.)
i.e.

plot(x,y,'b;test;');

plots a blue line with key: "test"

2.) Have you looked at the sparse package by Andy Adler. It uses the
SuperLU lib. You can download it from [1] or using anonymous cvs from
[2]. I just tried it for a real problem and it works very well (spline
approximation).

[1] http://users.powernet.co.uk/kienzle/octave/index.html
[2] http://sourceforge.net/cvs/?group_id=2888 (take the octave module)

hope this helps.

Bye Kai
-- 
Kai Habel
mailto:address@hidden



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