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uni		#81 Posted : 06 December 2018 11:36:46(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Updated. Now you can also use simple form for D() function definition.
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4 users thanked uni for this useful post.		on 06/12/2018(UTC),  on 06/12/2018(UTC),  on 06/12/2018(UTC),  on 06/12/2018(UTC)
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uni		#82 Posted : 06 December 2018 12:01:27(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		But x in D(t,x) is vector.
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uni		#83 Posted : 24 December 2018 11:33:39(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Updated. Now x in simple D(t,x) definition must be a scalar. iode.examples.sm (205kb) downloaded 204 time(s). iode.kinetic1.sm (8kb) downloaded 117 time(s). iode.kinetic2.sm (15kb) downloaded 93 time(s). iode.kinetic3.sm (15kb) downloaded 97 time(s). iode.integrate.sm (11kb) downloaded 107 time(s). iode.test1.sm (23kb) downloaded 102 time(s). iode.test2.sm (23kb) downloaded 94 time(s). iode.Amplitude detector.sm (21kb) downloaded 106 time(s). iode.examples.pdf (417kb) downloaded 171 time(s). iode.kinetic1.pdf (75kb) downloaded 94 time(s). iode.kinetic2.pdf (91kb) downloaded 72 time(s). iode.kinetic3.pdf (89kb) downloaded 74 time(s). iode.integrate.pdf (89kb) downloaded 82 time(s). iode.test1.pdf (117kb) downloaded 78 time(s). iode.test2.pdf (122kb) downloaded 73 time(s). iode.Amplitude detector.pdf (148kb) downloaded 79 time(s). Edited by user 25 December 2018 20:16:14(UTC)  | Reason: Not specified
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4 users thanked uni for this useful post.		on 24/12/2018(UTC),  on 24/12/2018(UTC),  on 24/12/2018(UTC),  on 24/12/2018(UTC)
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uni		#84 Posted : 16 January 2019 12:05:17(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Updated. Rkadapt() fixed.
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3 users thanked uni for this useful post.		on 16/01/2019(UTC),  on 16/01/2019(UTC),  on 16/01/2019(UTC)
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uni		#85 Posted : 31 January 2019 23:43:52(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Updated ( >= SMath Studio 0.99.6970). Changes: - divided into two plugins (the second one is Intel ODE Solver Library); - version changed (0.2.x.x); - refactored. Edited by user 01 February 2019 04:01:14(UTC)  | Reason: Not specified
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uni		#86 Posted : 11 February 2019 15:36:21(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Some news. It's hard but I want to realize a general solution for some types of tasks. Specially for this I need more powerful symbolic engine inside SMath. Therefore I made symcs project. I hope that we can use this solution in other similar cases. That's why I split the plugin.
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2 users thanked uni for this useful post.		on 11/02/2019(UTC),  on 11/02/2019(UTC)
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omorr		#87 Posted : 11 February 2019 17:01:58(UTC)
Rank: Administration Groups: Registered, Advanced Member Joined: 23/06/2009(UTC) Posts: 1,740 Was thanked: 318 time(s) in 268 post(s)		I think that most of the Mathcad users know what you intend to do and I really appreciate that Regards, Radovan
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Jean Giraud		#88 Posted : 11 February 2019 21:52:40(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 983 time(s) in 811 post(s)		Originally Posted by: omorr I think that most of the Mathcad users know what you intend to do and I really appreciate that Viacheslav is an ancient Mathsoft visitor. I still have a document from Him ... 2D Implicit plot. Is possible to code 1/1 Mathcad Given/ODEsolve ?
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uni		#89 Posted : 11 February 2019 22:35:16(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		No, Jean, 1/1 - not possible. Now they have two different realisations: MC11-MC15 and Prime. But I can do something similar. Plugin can implicity collect information about available ode solvers and you can choose them in the context menu.
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1 user thanked uni for this useful post.		on 12/02/2019(UTC)
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Jean Giraud		#90 Posted : 11 February 2019 22:52:19(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 983 time(s) in 811 post(s)		Originally Posted by: uni No, Jean, 1/1 - not possible. Now they have two different realisations: MC11-MC15 and Prime. But I can do something similar. Plugin can implicity collect information about available ode solvers and you can choose them in the context menu. I can see you "busy" ! Gorgeous context menu. What is that Smath Community doing: Building Cathedrals/Pyramids ? You mean: Mathcad Prime "cluster fuck" in US appreciation from Collab.
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Razonar		#91 Posted : 11 July 2021 06:23:42(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,473 Was thanked: 925 time(s) in 588 post(s)		Originally Posted by: uni Some news. It's hard but I want to realize a general solution for some types of tasks. Specially for this I need more powerful symbolic engine inside SMath. Therefore I made symcs project. I hope that we can use this solution in other similar cases. Hi uni. It is possible to enable a clone of that component for return only the expressions inside? For example, the set of the equations Also, it is possible too to add the option for mark with a round box the area? Best regards. Alvaro.
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uni		#92 Posted : 11 July 2021 07:20:49(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Yes, it is possible.
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1 user thanked uni for this useful post.		on 11/07/2021(UTC)
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uni		#93 Posted : 26 November 2021 06:11:56(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Coming soon, but for now as an experiment.
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2 users thanked uni for this useful post.		on 26/11/2021(UTC),  on 29/11/2021(UTC)
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uni		#94 Posted : 28 November 2021 21:47:31(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		I have verified that linear interpolation is used, which is described in the manual. I changed the interpolation method to linear and also changed the notation of the derivative by analogy ( "`" ).
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1 user thanked uni for this useful post.		on 29/11/2021(UTC)
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uni		#95 Posted : 28 November 2021 22:42:18(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Prime symbol looks much better (′). I think it's better to use it.
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uni		#96 Posted : 29 November 2021 00:49:59(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		I was wrong. Linear interpolation and linear spline interpolation are different things. I will try to find the formulas that are used in these functions.
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uni		#97 Posted : 29 November 2021 08:43:07(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		A simple test that shows the interpolation method used by the ODE solver. Obviously, the lspline() function is used. Odesolve() with rkfixed method (Mathcad 15). Odesolve interpolation test.mcd.zip (9kb) downloaded 8 time(s). The same for Mathcad Prime 7.0 (Adams method used). Edited by user 29 November 2021 09:15:42(UTC)  | Reason: Not specified
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uni		#98 Posted : 30 November 2021 02:31:00(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 10/11/2010(UTC) Posts: 1,618 Was thanked: 1381 time(s) in 806 post(s)		Ok, I found a bug in rkfixed() and finally figured out the difference between interpolation functions. In the picture below, I repeated part of the calculations from Mathcad. As you can see, to interpolate the numerical solution of the ODE, a cubic spline is used, linear at the end points. Bugs will be fixed when the build server starts working. Links: 1. Cubic spline 2. Cubic Spline Interpolation Cubic spline interpolation using Mathcad (2009).pdf (257kb) downloaded 40 time(s). Edited by user 30 November 2021 04:37:19(UTC)  | Reason: Not specified
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Jean Giraud		#99 Posted : 30 November 2021 03:30:48(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 983 time(s) in 811 post(s)		Originally Posted by: uni Ok, I found a bug in rkfixed() and finally figured out the difference between interpolation functions. In the picture below, I repeated part of the calculations from Mathcad. As you can see, to interpolate the numerical solution of the ODE, a cubic spline is used, linear at the end points. Thanks Viacheslav ... superb demo. BTW, I was wrong ODEsolve is lspline MCD 11. Years ago, Tom G. had exposed the different deficiencies wrt to each l_p_c cubic spline ... Matlab as well. So, your next headache is to figure the best solver from the huge Smath library [17], Mathcad stiff is Radau MCD 2001i, 11. Cheers ... Jean.
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overlord		#100 Posted : 30 November 2021 07:28:14(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/07/2013(UTC) Posts: 1,173 Was thanked: 534 time(s) in 358 post(s)		Originally Posted by: Jean Giraud BTW, I was wrong ODEsolve is lspline MCD 11. This day should be accepted as a milestone. We have to celebrate this day annually. There should be carnivals, fireworks should enlighten the night.
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