search

rtoy / maxima

A Clone of Maxima's repo
Other
0 stars 0 forks source link

Plot leaves range with jacobi functions #3093

Closed rtoy closed 1 week ago

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:44 Created by parismb on 2008-08-16 22:53:07 Original: https://sourceforge.net/p/maxima/bugs/1478

Hello,

I am working with jacobi elliptic functions with both 2d and parametric graphs and am finding they leave the domain when I use these functions under multiplication. I believe the numeric package is running out of memory or the plotter makes some similar error. How do I fix this, or how can it be fixed?

specifically try jacobi_dn()*jacobi_dn() with two frequencies (one about one tenth the other) for times exceeding 48.

This reliably causes the graph to spiral out of control and I was wondering if there was a fix.

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:45 Created by robert_dodier on 2008-08-24 05:04:55 Original: https://sourceforge.net/p/maxima/bugs/1478/#aeb4

Logged In: YES user_id=501686 Originator: NO

Thanks for this report. Please post an example in the form of specific Maxima expressions which we can use to reproduce the error. Thanks for your help. Robert Dodier

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:48 Created by parismb on 2008-08-29 19:12:13 Original: https://sourceforge.net/p/maxima/bugs/1478/#e224

Logged In: YES user_id=2183455 Originator: YES

jacobi_cn(t,.7)*jacobi_cn(.1*t,.9)

wxplot2d([%], [t,0,40])

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:52 Created by rtoy on 2008-08-30 02:14:51 Original: https://sourceforge.net/p/maxima/bugs/1478/#8a16

Logged In: YES user_id=28849 Originator: NO

This is a bug in the computation of jacobi_cn. Try, eg, jacobi_cn(100,.7)

The algorithms for computing jacobi_cn and jacobi_dn need to be examined. jacobi_sn appears to be ok.

Changing category to floating point instead of plotting.

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:56 Created by rtoy on 2008-08-30 02:14:52 Original: https://sourceforge.net/p/maxima/bugs/1478/#e9f7

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:40:59 Created by rtoy on 2009-01-01 00:22:10 Original: https://sourceforge.net/p/maxima/bugs/1478/#7987

rtoy commented 1 week ago

Imported from SourceForge on 2024-07-07 13:41:03 Created by rtoy on 2009-01-01 00:22:10 Original: https://sourceforge.net/p/maxima/bugs/1478/#094b

This should be fixed in CVS, ellipt.lisp, rev 1.30.