ODE2 - Not a proper differential equation?

#1 Posted: 10/7/2024 3:12:57 PM

Cornel

2 likes in 78 posts.

Group: User

Hi,

Why is saying that its not a proper differential equation?

#2 Posted: 10/7/2024 5:20:54 PM

StvMath

38 likes in 62 posts.

Group: User

Wrote
Hi,

Why is saying that its not a proper differential equation?

#3 Posted: 10/7/2024 5:56:58 PM

Cornel

2 likes in 78 posts.

Group: User

And then if someone wants to solve a > 2 order differential equation (3th order, 4th order, etc), how to do it? What algorithm, command should I use/rely in SMath Studio?

#4 Posted: 10/7/2024 6:18:13 PM

Вячеслав Мезенцев

1,487 likes in 1,792 posts.

Group: Moderator

Russia ☭ forever, Viacheslav N. Mezentsev

#5 Posted: 10/7/2024 6:57:17 PM

Cornel

2 likes in 78 posts.

Group: User

And there are also some approach using maxima engine/command?

#6 Posted: 10/8/2024 3:11:16 PM

Martin Kraska

1,260 likes in 2,186 posts.

Group: Moderator

Wrote
And there are also some approach using maxima engine/command?

Sure. Here is one using Maxima's desolve function and one using ODE.2 (without solving for the integration constants)

RLC.sm (23.17 KiB) downloaded 350 time(s).

Feder-Masse.sm (23.13 KiB) downloaded 356 time(s).

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

#7 Posted: 10/9/2024 2:42:41 PM

Cornel

2 likes in 78 posts.

Group: User

Martin, do you have an example for a third order differential equation on how to solve it? because ode2 is limited to second order differentia eq as far as I understood. And my previous question was on how to sollve a differential eq of order > 2 (3, 4, etc)?

#8 Posted: 10/9/2024 6:47:10 PM

Martin Kraska

1,260 likes in 2,186 posts.

Group: Moderator

Here I cirumvent the limitations of the translation using multiple intervals of integration. Example from the interactive handbook.

Worksheet36.sm (40.73 KiB) downloaded 499 time(s).

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx

SMath Forum

ODE2 - Not a proper differential equation? - Messages