The value went beyond the maximum allowed positive number - the value went beyond the maximum allowed positive number, error in the solve function Options  Email this topic  Watch this topic  Print this topic » Normal Threaded

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Joki720		#1 Posted : 12 February 2020 16:38:12(UTC)
Rank: Member Groups: Registered Joined: 12/02/2020(UTC) Posts: 12		Who has faced such a problem, how can it be solved? Project from below Poverochnyjj raschjot ehzhektora.sm (85kb) downloaded 15 time(s).
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Jean Giraud		#2 Posted : 12 February 2020 18:07:47(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Joki720 Who has faced such a problem, how can it be solved? "result above max ..." has no pertinent meaning in your project. If you attempt "roots" on the numerator only ... "Units don't match" No need to go further ... zap the units in the project.
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Joki720		#3 Posted : 12 February 2020 18:38:24(UTC)
Rank: Member Groups: Registered Joined: 12/02/2020(UTC) Posts: 12		Originally Posted by: Jean Giraud Originally Posted by: Joki720 Who has faced such a problem, how can it be solved? "result above max ..." has no pertinent meaning in your project. If you attempt "roots" on the numerator only ... "Units don't match" No need to go further ... zap the units in the project. I made a mistake, there should be a solve function, in this place the same error
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Jean Giraud		#4 Posted : 12 February 2020 20:57:49(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Joki720 I made a mistake, there should be a solve function, in this place the same error Same answer: Units don't match. How can you solve what you can't plot or evaluate ?
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mkraska		#5 Posted : 13 February 2020 13:44:15(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)		You can use the function FindRoot() from the Nonlinear Solvers plugin. The function automatically assigns the solution to the variables. Единицы измерения здесь не при чем.
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
1 user thanked mkraska for this useful post.		on 14/02/2020(UTC)
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Joki720		#6 Posted : 14 February 2020 19:09:51(UTC)
Rank: Member Groups: Registered Joined: 12/02/2020(UTC) Posts: 12		Originally Posted by: mkraska You can use the function FindRoot() from the Nonlinear Solvers plugin. The function automatically assigns the solution to the variables. Единицы измерения здесь не при чем. why do you use 0.2 and 0.5?
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PompelmoTell		#7 Posted : 14 February 2020 19:57:29(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/12/2011(UTC) Posts: 319 Location: italy Was thanked: 109 time(s) in 93 post(s)		Joki, Martin could have drawn the two curves and graphically estimated the two solutions sergio
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Joki720		#8 Posted : 14 February 2020 20:52:49(UTC)
Rank: Member Groups: Registered Joined: 12/02/2020(UTC) Posts: 12		Originally Posted by: PompelmoTell Martin could have drawn the two curves and graphically estimated the two solutions sergio The solution must be automatic, plotting make and evaluating it is not appropriate
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Jean Giraud		#9 Posted : 15 February 2020 01:34:05(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Joki720 The solution must be automatic, plotting make and evaluating it is not appropriate OK ... don't plot => find min/max. Don't you need a road to drive the car from point A to point B ?
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Jean Giraud		#10 Posted : 15 February 2020 04:56:17(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Joki720 Who has faced such a problem, how can it be solved? Common from ill posed construction. Consider yellow up until you can plot that system(x,y):= .... from there it should be solvable. Poverochnyjj raschjot ehzhektora [zap Units, define the Undefined ...].sm (95kb) downloaded 16 time(s).
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mkraska		#11 Posted : 15 February 2020 12:37:16(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,986 Was thanked: 1124 time(s) in 721 post(s)		Originally Posted by: Joki720 Originally Posted by: PompelmoTell Martin could have drawn the two curves and graphically estimated the two solutions sergio The solution must be automatic, plotting make and evaluating it is not appropriate Go on dreaming. If you are in non-linear systems and you can't find a symbolic solution (Maxima's Solve() got stuck when I tried) then you need numerical procedures for solution. These always need an initial guess (Newton-Raphson) or a search region (bisection). The various procedures just differ in how efficient or how robust they are. Some of them may have quite impressive radii of convergence for particular systems but none has infinite radius for all systems. Furthermore, there remains the problem of uniqueness of a solution. The only solvers in SMath capable of providing multiple solutions are the solve() finds all solutions of a single equation within a given range Solve() from the Maxima plugin, which finds symbolic solutions. Blatt21.sm (6kb) downloaded 15 time(s).
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
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Jean Giraud		#12 Posted : 15 February 2020 18:10:50(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: mkraska Furthermore, there remains the problem of uniqueness of a solution. The only solvers in SMath capable of providing multiple solutions are the solve() finds all solutions of a single equation within a given range Solve() from the Maxima plugin, which finds symbolic solutions. Quite right and not enough wrt complex roots. Cubic solver Exercise.sm (39kb) downloaded 18 time(s).
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Jean Giraud		#13 Posted : 15 February 2020 23:54:43(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Always avoid ill posed polynomials.
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Jouko		#14 Posted : 16 February 2020 21:10:14(UTC)
Rank: Newbie Groups: Registered Joined: 08/02/2020(UTC) Posts: 3 Location: Roodepoort		To OP's original question. I did get the same/similar error message on linear interpolation. One of the 5 required values had wrong value. After correcting no issues.
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Jean Giraud		#15 Posted : 17 February 2020 02:47:13(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Jouko To OP's original question. I did get the same/similar error message on linear interpolation. One of the 5 required values had wrong value. After correcting no issues. . What linear interpolation is doing here ? If that document makes sense, return with comments. Poverochnyjj raschjot ehzhektora [solve].sm (96kb) downloaded 9 time(s).
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Jean Giraud		#16 Posted : 17 February 2020 05:09:30(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Originally Posted by: Jean Giraud What linear interpolation is doing here ? If that document makes sense, return with comments. I imagine you mean the very last part of the document. The system looks ill posed, visit Solve Lecture last 3 days. Poverochnyjj raschjot ehzhektora [solve, spline].sm (105kb) downloaded 14 time(s).
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Jean Giraud		#17 Posted : 17 February 2020 15:35:01(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		... maybe we can leave it as such ... cleanup ? Poverochnyjj raschjot ehzhektora [solve, spline].sm (111kb) downloaded 15 time(s). Inst_Isentropic Discharge.sm (174kb) downloaded 20 time(s).
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