Thanks for your detailed answer !
This clarifies lots of things for me !
On 24 juin, 19:05, William Stein <wst...@gmail.com> wrote:
> On Wed, Jun 24, 2009 at 6:47 PM, Nicolas<nicolas.fresseng...@gmail.com> wrote:
>
> > Sorry, I thought this was clear.
>
> > when you type
> > sage: a=x+x+1
> > sage: a
> > 2*x + 1
>
> > If I understood correctly, the simplification of x+x by 2*x is done by
> > maxima in the background.
>
> Just to be clear, that is definitely *NOT* the case. It used to be
> the case before sage-4.0, but is not the case now. Here's how you
> can check this:
>
> teragon:~ wstein$ sage
> ----------------------------------------------------------------------
> | Sage Version 4.0.2, Release Date: 2009-06-18 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: x + x + 1
> 2*x + 1
> sage:
> Exiting SAGE (CPU time 0m0.08s, Wall time 0m23.29s).
> You have new mail in /var/mail/wstein
> teragon:~ wstein$ sage
> ----------------------------------------------------------------------
> | Sage Version 4.0.2, Release Date: 2009-06-18 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
> sage: f = integrate(sin(x^2))
> sage:
> Exiting SAGE (CPU time 0m0.16s, Wall time 0m6.97s).
> Exiting spawned Maxima process.
> teragon:~ wstein$
>
> Notice that the first time there's no "Exiting spawned Maxima process."
> message.
>
> > I f x is here much more complicated (or if the expression itself is
> > complicated), the simplification process can become lengthy and even
> > crash maxima. So my question was : is this possible that when I ask a
> > in the second line above, that the answer would be x+x+1
>
> Note that maxima isn't involved.
>
>
>
> > Sorry for the trouble
>
> > Nicolas
>
> > On 23 juin, 11:19, William Stein <wst...@gmail.com> wrote:
> >> On Tue, Jun 23, 2009 at 9:40 AM, Nicolas<nicolas.fresseng...@gmail.com>
> >> wrote:
>
> >> > I am in the writing of a program that deals with rather lengthy
> >> > symbolic expressions involving unknown functions and differentiation.
> >> > When running commands like derivatives, it seems that maxima
> >> > automatically runs into place to simplify the obtained expressions.
> >> > (This is consistent with the documentation)
>
> >> > In interactive sessions, this is perfectly good, but for my
> >> > application, it has two major problems :
> >> > - things are slowed down a lot because maxima tries to simplify long
> >> > expressions which cannot be much simplified
> >> > - worse : maxima often crashes which renders the whole program
> >> > difficult to use
>
> >> > My solution would be to disable maxima automated simplification but I
> >> > cannot figure out if this is possible in sage or how to do it (I am
> >> > using sage.4.0.1 on Fedora 10)
>
> >> Please provide a much more precise example than what you've given
> >> above (which is no examples at all).
>
> >> -- William
>
> --
> William Stein
> Associate Professor of Mathematics
> University of Washingtonhttp://wstein.org
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to sage-support@googlegroups.com
To unsubscribe from this group, send email to
sage-support-unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/sage-support
URLs: http://www.sagemath.org
-~----------~----~----~----~------~----~------~--~---
