Hi again, I have noticed that a lot of people post this info when
talking about issues in maxima:
(%i1) build_info();
Maxima version: 5.25.1
Maxima build date: 14:1 8/29/2011
Host type: x86_64-unknown-linux-gnu
Lisp implementation type: SBCL
Lisp implementation version: 1.0.29.11.debian
Cheers
On Thu, Nov 10, 2011 at 15:18, cheater cheater <cheater00 at gmail.com> wrote:
> Hi guys! I have just subscribed to the mailing list. Recently I've
> been using Maxima a lot for analyzing the performance of computer
> algorithms. I'm surprised at how easy it is to master. There are,
> however, some things that are non-obvious.
>
> I have run into a problem which I cannot get past, though. You see, I
> am using Maxima to do some curve fitting, and then count an integral.
> However, sometimes the curve fits have parameters which turn out to be
> "arbitrary". This isn't really so, but I guess the newton-raphson gets
> confused around 0. For example it'll return things such as:
>
> 3^2 + 0.22e-40*%r21 ? ? ?where obviously any small changes to r21 will
> not change the complete value at all (the changes to %r21 get
> truncated).
>
> The objective of the maxima code I am executing is to calculate those
> integrals and put them out to stdout and have the Python script (which
> does a lot of other work) take these numbers and continue analysis. Of
> course, Python cannot interpret %r21 and throws exceptions. Therefore
> I thought I would just plug something into those arbitrary values. I
> did something like this:
>
> arbitrary_values: [%r0 = 1, %r1 = 1, ..., %r30 = 1]
>
> output: ev(calculated_integral,arbitrary_values,nouns,numer)
>
> however, when I do that, I get lisp reporting errors - floating point overflow:
>
> Maxima encountered a Lisp error:
> ? arithmetic error FLOATING-POINT-OVERFLOW signalled
> Automatically continuing. To enable the Lisp debugger set
> *debugger-hook* to nil.
>
> (note the formatting may be incorrect because of the way my program
> gets this output from maxima through stdout)
>
> What can I do?
>
> I am on Ubuntu GNU/Linux 10.04 and I understand that maxima is using
> the SBCL - Steel Bank Common Lisp - to run its computational engine.
>
> If anyone has any ideas, I would be very thankful. You'd help not only
> me but also the users of the software which will be released under
> GPL.
>
> Thanks for reading!
>