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A gorgeous piece of work from Smath built-in solver. Enjoy, Jean  ODE HIRES.sm (49kb) downloaded 95 time(s).
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 2 users thanked Jean Giraud for this useful post.
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on 09/10/2016(UTC), on 09/10/2016(UTC)
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  Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740   Was thanked: 318 time(s) in 268 post(s)
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Thank you Jean for this example,
You can also try the solvers from Matlab C++ Math Library and from ODE Solvers plugins (stiff solvers) as well.
Regards,
Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Guest
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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I'm with you Radovan, HIRES solves equally well from both solvers libraries [dn_ & mwode] Example 2 [from Yuk]: NONE solve except Smath built-in rkfixed, at a very specific number of points which is different than Mathcad. Example 3 [from Valery] solves ONLY Matlab "mwode..." All that is documented in the attached. All that said, you may wonder how it works in real life. From educated practice, the Chemist can pose the solver frame work ... from there and experimental results, some solvers will optimise the "Frame work model" [typical of medical]. On that optimise option, Mathcad 11 is fully capable. Several examples were exchanged in the Mathsoft collaboratory. I will be back on that... cheers, Jean ODE HIRES.sm (80kb) downloaded 41 time(s).
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  Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,494  Was thanked: 1274 time(s) in 745 post(s)
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Jean, you can use RelTol and AbsTol constants with the solvers. EDIT: Originally Posted by: Jean Giraud  NONE solve except Smath built-in rkfixed All ode solvers realized as external functions. They are located in the plugins. rkfixed too ( ODE Solvers plugin). So, there are no any built-in ode solvers. Edited by user 10 October 2016 11:19:46(UTC)
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Russia ☭ forever
Viacheslav N. Mezentsev |
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