MAXIMA PLUGIN

MAXIMA PLUGIN - Problem when solving a system of equations with MAXIMA PLUGIN - Messages

#1 Posted: 3/30/2026 1:37:56 AM
Jazmin

Jazmin

0 likes in 1 posts.

Group: User

Hi, I'm new to using Smath.
I'm having trouble solving systems of equations with Maxima. The "Solve" function returns very precise numbers (in fractions), and then the "Assign" function says the number is either too large or too small.
My problem can be seen on page 6
TP03.sm (1.95 MiB) downloaded 19 time(s).
Edited 3/30/2026 1:42:19 AM
#2 Posted: 3/30/2026 8:56:46 AM
ioan92

ioan92

178 likes in 113 posts.

Group: User

Hi Jasmin,
It seems that the F2 value is undefined ?
Regards,
Ioan
Do to others as you would like them to do to you! Knowledge is of no value unless you put it into practice - Chekhov
#3 Posted: 3/30/2026 8:57:09 PM
Martin Kraska

Martin Kraska

1,338 likes in 2,252 posts.

Group: Moderator

@Ioan: F2 seems to be an unknown, so it is ok to be undefined.

The problem is that you use a symbolic solver and feed it with floating point equations. What do you expect? The solver is forced to resort to extremely long rational numbers in order to avoid cancellation of significant digits,

Use a numerical solver instead or set everything up to the solver command to symbolic optimization.

Then you get an exact solution, which is reasonably compact.

grafik.png

Here is an old SMath sheet of mine for planar truss structures.

Fachwerk Kran.sm (78.17 KiB) downloaded 10 time(s).






Edited 3/30/2026 9:03:12 PM
Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
1 users liked this post
ioan92 3/31/2026 8:39:00 AM
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