Looking for a 64-bit build with large memory limit
Subject: Looking for a 64-bit build with large memory limit
From: Stavros Macrakis
Date: Wed, 5 Dec 2007 11:24:30 -0500
On Dec 5, 2007 10:02 AM, Paul Richards <paul.richards at gmail.com> wrote:
> ...I think it has an 8GiB
> limit by default, which for what I'm trying to solve still wasn't
> enough.
>
> I think I need to bite the bullet and find a more intelligent way of
> solving my equations; rather than just blindly plugging them into some
> CAS software.
>
There are very few symbolic problems where Maxima can do anything useful in
a reasonable amount of time with that much memory. And even when it could,
its algorithms aren't suitable even for smallish cases. For instance:
determinant(0*ident(20)) ....
m: ident(15)*0 -- 15x15 zero matrix
determinant(m) .... 1.5 sec
same with ident(16) ...... 5.4 sec
same with ident(17) ..... 36.4 sec (exponential time?)
taylor(sin(x),x,0,500)^2 .... 5.8 sec
.......................600............9.9
.......................700............16.1 (cubic time)
If they are strictly numeric problems, then there are surely better systems
to address them.
What kind of equations are they?
-s