DotNumerics - Initial-value problem for nonstiff and stiff ordinary differential equations ODEs - Messages
#21 Posted: 8/1/2018 12:54:24 PM
Simple test 2.

DotNumerics.ode.test2.sm (21.23 KiB) downloaded 655 time(s).
DotNumerics.ode.test2.pdf (79.99 KiB) downloaded 353 time(s).

DotNumerics.ode.test2.sm (21.23 KiB) downloaded 655 time(s).
DotNumerics.ode.test2.pdf (79.99 KiB) downloaded 353 time(s).
Russia ☭ forever, Viacheslav N. Mezentsev
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#22 Posted: 8/1/2018 9:57:14 PM
WroteSimple 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) downloaded 675 time(s).
#23 Posted: 9/9/2018 2:23:36 PM
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) downloaded 724 time(s).

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) downloaded 724 time(s).

Martin KraskaPre-configured portable distribution of SMath Studio: https://en.smath.info/wiki/SMath%20with%20Plugins.ashx
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#24 Posted: 9/10/2018 6:48:25 AM
Updated for SS 0.99.6824. Intervals issue fixed.
Russia ☭ forever, Viacheslav N. Mezentsev
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#25 Posted: 12/6/2018 2:42:53 PM
Updated.
Changes:
- zero point issue fixed;
- added support for the simple D(t,x) definition.
Changes:
- zero point issue fixed;
- added support for the simple D(t,x) definition.
Russia ☭ forever, Viacheslav N. Mezentsev
#26 Posted: 12/24/2018 9:13:53 AM
Updated.

dn.ode.kinetic1.sm (8.26 KiB) downloaded 786 time(s).
dn.ode.kinetic2.sm (12.59 KiB) downloaded 732 time(s).
dn.ode.kinetic3.sm (12.28 KiB) downloaded 734 time(s).
dn.ode.test1.sm (19.58 KiB) downloaded 748 time(s).
dn.ode.test2.sm (18.88 KiB) downloaded 740 time(s).
dn.ode.Amplitude detector.sm (20.17 KiB) downloaded 755 time(s).
dn.ode.kinetic1.pdf (77.42 KiB) downloaded 446 time(s).
dn.ode.kinetic2.pdf (93.05 KiB) downloaded 428 time(s).
dn.ode.kinetic3.pdf (91.31 KiB) downloaded 412 time(s).
dn.ode.test1.pdf (115.72 KiB) downloaded 415 time(s).
dn.ode.test2.pdf (120.44 KiB) downloaded 404 time(s).
dn.ode.Amplitude detector.pdf (148.87 KiB) downloaded 406 time(s).

dn.ode.kinetic1.sm (8.26 KiB) downloaded 786 time(s).
dn.ode.kinetic2.sm (12.59 KiB) downloaded 732 time(s).
dn.ode.kinetic3.sm (12.28 KiB) downloaded 734 time(s).
dn.ode.test1.sm (19.58 KiB) downloaded 748 time(s).
dn.ode.test2.sm (18.88 KiB) downloaded 740 time(s).
dn.ode.Amplitude detector.sm (20.17 KiB) downloaded 755 time(s).
dn.ode.kinetic1.pdf (77.42 KiB) downloaded 446 time(s).
dn.ode.kinetic2.pdf (93.05 KiB) downloaded 428 time(s).
dn.ode.kinetic3.pdf (91.31 KiB) downloaded 412 time(s).
dn.ode.test1.pdf (115.72 KiB) downloaded 415 time(s).
dn.ode.test2.pdf (120.44 KiB) downloaded 404 time(s).
dn.ode.Amplitude detector.pdf (148.87 KiB) downloaded 406 time(s).
Russia ☭ forever, Viacheslav N. Mezentsev
4 users liked this post
NDTM Amarasekera 12/24/2018 9:44:00 AM, sergio 12/24/2018 11:04:00 AM, frapuano 12/24/2018 2:23:00 PM, Radovan Omorjan 12/24/2018 2:52:00 PM
#27 Posted: 12/25/2018 2:49:08 PM
#30 Posted: 12/20/2021 4:18:13 PM

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 Posted: 8/21/2022 2:43:28 AM
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) downloaded 621 time(s).
Best regards.
Alvaro.
dn_ExplicitRK45 issue.sm (8.42 KiB) downloaded 621 time(s).
Best regards.
Alvaro.
1 users liked this post
Вячеслав Мезенцев 8/22/2022 3:11:00 AM
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