DotNumerics - SMath

#21 Pubblicato: 01/08/2018 12:54:24

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Simple test 2.

DotNumerics.ode.test2.sm (21,23 KiB) scaricato 1767 volta(e).
DotNumerics.ode.test2.pdf (79,99 KiB) scaricato 879 volta(e).

Russia ☭ forever, Viacheslav N. Mezentsev

2 utenti hanno apprezzato questo post

sergio 01/08/2018 18:06:00, Radovan Omorjan 02/08/2018 03:05:00

#22 Pubblicato: 01/08/2018 21:57:14

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Wrote
Simple test 2.

Works nice conventional/visual [6179].
That document, if it would come from other designer
would pass my QA [Quality Assurance].

Jean

DotNumerics.ode.test2.sm (24,51 KiB) scaricato 1863 volta(e).

#23 Pubblicato: 09/09/2018 14:23:36

Martin Kraska

1.361 apprezzamenti in 2.275 post.

Gruppo: Moderator

It seems that all the dotnumeric ode solver functions fail to add the last step to the solution. In the given example, the exact solution is (approximately) met if the end value of x is increased by one step (x_end/steps).

The sheet is easily extended to whatever ode solvers by adding their name to the search list. The actually available solvers depend on what plugins are installed.

Section Math ODE precision.sm (23,66 KiB) scaricato 1917 volta(e).
$Section Math ODE precision.png$

Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9

2 utenti hanno apprezzato questo post

frapuano 09/09/2018 17:18:00, Вячеслав Мезенцев 10/09/2018 05:37:00

#24 Pubblicato: 10/09/2018 06:48:25

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Updated for SS 0.99.6824. Intervals issue fixed.

Russia ☭ forever, Viacheslav N. Mezentsev

3 utenti hanno apprezzato questo post

sergio 10/09/2018 07:02:00, frapuano 10/09/2018 09:23:00, NDTM Amarasekera 10/09/2018 09:48:00

#25 Pubblicato: 06/12/2018 14:42:53

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Updated.

Changes:
- zero point issue fixed;
- added support for the simple D(t,x) definition.

Russia ☭ forever, Viacheslav N. Mezentsev

#26 Pubblicato: 24/12/2018 09:13:53

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Updated.

dn.ode.kinetic1.sm (8,26 KiB) scaricato 2016 volta(e).
dn.ode.kinetic2.sm (12,59 KiB) scaricato 1884 volta(e).
dn.ode.kinetic3.sm (12,28 KiB) scaricato 1957 volta(e).
dn.ode.test1.sm (19,58 KiB) scaricato 1959 volta(e).
dn.ode.test2.sm (18,88 KiB) scaricato 1940 volta(e).
dn.ode.Amplitude detector.sm (20,17 KiB) scaricato 1988 volta(e).

dn.ode.kinetic1.pdf (77,42 KiB) scaricato 1110 volta(e).
dn.ode.kinetic2.pdf (93,05 KiB) scaricato 1036 volta(e).
dn.ode.kinetic3.pdf (91,31 KiB) scaricato 1029 volta(e).
dn.ode.test1.pdf (115,72 KiB) scaricato 1013 volta(e).
dn.ode.test2.pdf (120,44 KiB) scaricato 995 volta(e).
dn.ode.Amplitude detector.pdf (148,87 KiB) scaricato 1049 volta(e).

Russia ☭ forever, Viacheslav N. Mezentsev

4 utenti hanno apprezzato questo post

NDTM Amarasekera 24/12/2018 09:44:00, sergio 24/12/2018 11:04:00, frapuano 24/12/2018 14:23:00, Radovan Omorjan 24/12/2018 14:52:00

#27 Pubblicato: 25/12/2018 14:49:08

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Native works as well.
You can try rkfixedSteven.

#28 Pubblicato: 25/12/2018 16:25:11

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Read + interesting stuff.

Chemical Kinetics: Introduction with Mathcad/Maple/MCS. Chapter 3

1 utenti hanno apprezzato questo post

frapuano 25/12/2018 19:01:00

#29 Pubblicato: 09/12/2021 09:10:25

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Plugin updated.

Changes:

- added support the mathematical form of the problem for ODE solvers;
- refactored.

Russia ☭ forever, Viacheslav N. Mezentsev

1 utenti hanno apprezzato questo post

sergio 09/12/2021 11:40:00

#30 Pubblicato: 20/12/2021 16:18:13

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Plugin updated.

Changes:

- solution restructured;
- converting the task for the ODE solver to the numerical form is now performed through the Mathcad Toolbox plugin (to avoid code duplication), so it must be installed;
- refactored.

Solvers that support mathematical notation now reuse code from the Mathcad Toolbox plugin. Now there is no need to recompile every such plugin.

Russia ☭ forever, Viacheslav N. Mezentsev

#31 Pubblicato: 21/08/2022 02:43:28

Alvaro

1.139 apprezzamenti in 1.805 post.

Gruppo: User

Hi Viacheslav. There are an issue with Implicit and dn_ExplicitRK45, just in the first element. Please see the attached.

dn_ExplicitRK45 issue.sm (8,42 KiB) scaricato 1769 volta(e).

Best regards.
Alvaro.

1 utenti hanno apprezzato questo post

Вячеслав Мезенцев 22/08/2022 03:11:00

#32 Pubblicato: 22/08/2022 03:12:45

Вячеслав Мезенцев

1.558 apprezzamenti in 1.868 post.

Gruppo: Moderator

Plugin updated.

Changes:

- fixed values of initial conditions in the output array for dn_ImplicitRK5() and dn_ExplicitRK45().

Russia ☭ forever, Viacheslav N. Mezentsev

2 utenti hanno apprezzato questo post

sergio 22/08/2022 04:19:00, Alvaro 23/08/2022 20:15:00

Forum SMath

DotNumerics - Initial-value problem for nonstiff and stiff ordinary differential equations ODEs - Messaggi