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OchkovVF		#1 Posted : 14 October 2023 21:31:44(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		See please the end of the attached file. 6-1-Mister-Class.sm (34kb) downloaded 10 time(s).
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Jean Giraud		#2 Posted : 15 October 2023 03:38:32(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: OchkovVF See please the end of the attached file. Triplet roots ... FindRoot not doctored. 6-1-Mister-Class (1).sm (67kb) downloaded 3 time(s).
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mkraska		#3 Posted : 15 October 2023 03:42:14(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,988 Was thanked: 1124 time(s) in 721 post(s)		The first error can be handled by wrapping the function in eval(). For the second one this does not help. I take the opportunity to advertise the Maxima Fit() function. It is explained in https://doi.org/10.25933/opus4-2949 chapter 6 (English) and in https://doi.org/10.25933/opus4-2948, chapter 9 (German). 6-1-Mister-Class Kr.sm (57kb) downloaded 5 time(s).
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
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OchkovVF		#4 Posted : 15 October 2023 03:53:20(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		And the Lord God created the function eval and the lord said this is good! And the Lord God created the Maxima and the lord said this is sehr kompliziert! Edited by user 15 October 2023 04:00:33(UTC)  | Reason: Not specified
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mkraska		#5 Posted : 15 October 2023 04:52:25(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,988 Was thanked: 1124 time(s) in 721 post(s)		Hm, where exactly do you see the most severe сложности in the use of the Maxima plugin? Perhaps everything that needs a handbook is too complicated nowadays I really like the curve fitting interface with the Fit() function, which might even be comprehensible from the подсказка in the dynamic help.
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
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Razonar		#6 Posted : 15 October 2023 06:19:13(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Hi. Polynomial fitting, returning the same values that Excel returns. From this post. fit_CKO.sm (52kb) downloaded 5 time(s). Best regards. Alvaro.
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OchkovVF		#7 Posted : 15 October 2023 20:35:01(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		Sorry! But the question was Why not How
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Razonar		#8 Posted : 16 October 2023 01:51:16(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Originally Posted by: OchkovVF Sorry! But the question was Why not How Hi Valery. Martin showed why. But for the quadratic case Máxima's Fit function does not return the same result as Excel, which could be said to have been taken as standard, since they are also the same as those usually obtained with the 'all powerful' (talking about of gods) a\b of Matlab. I made the post to show how those mythical values can also be obtained in SMath. Because SMath' solver isn't very powerful you can get those same values with your method using another, like the following one About the error vectorizing, you can see why taking a look of this Best regards. Alvaro.
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OchkovVF		#9 Posted : 16 October 2023 02:04:14(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		Originally Posted by: Razonar Originally Posted by: OchkovVF Sorry! But the question was Why not How Hi Valery. Martin showed why. But for the quadratic case Máxima's Fit function does not return the same result as Excel, which could be said to have been taken as standard, since they are also the same as those usually obtained with the 'all powerful' (talking about of gods) a\b of Matlab. I made the post to show how those mythical values can also be obtained in SMath. Because SMath' solver isn't very powerful you can get those same values with your method using another, like the following one About the error vectorizing, you can see why taking a look of this Best regards. Alvaro. Send please sm-file!
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Razonar		#10 Posted : 16 October 2023 02:48:34(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Originally Posted by: OchkovVF Send please sm-file! 6-1-Mister-Class with polyfit.sm (40kb) downloaded 5 time(s). 6-1-Mister-Class with polyfit.pdf (227kb) downloaded 5 time(s). Best regards. Alvaro.
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mkraska		#11 Posted : 16 October 2023 05:25:44(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,988 Was thanked: 1124 time(s) in 721 post(s)		There is not much sense in fitting functions with many degrees of freedom to data containing not much information. Any function which goes through the centroid of the data points will come up with a similar MSE. Is the second result really the best just because of it's lowest MSE?
		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 : 16 October 2023 06:33:28(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Valery, as it looks all doctored. Thanks Alvaro for the robust Broyden. Curious, Solver 30405 Slope/Intercept back on foot. 6-1-Mister-Class (1).sm (66kb) downloaded 1 time(s).
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OchkovVF		#13 Posted : 16 October 2023 07:06:59(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		And what about 3D fitting in SMath? See please my old problem in Mathcad http://twt.mpei.ac.ru/ochkov/car/c_e.html Online calculation http://twt.mpei.ac.ru/MCS/Worksheets/old-car.xmcd
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mkraska		#14 Posted : 16 October 2023 11:57:28(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,988 Was thanked: 1124 time(s) in 721 post(s)		The second and third fit aren't really robust (quite some dependence on initial guesses) Gebrauchtwagen.txt (1kb) downloaded 7 time(s). Gebrauchtwagen.sm (91kb) downloaded 7 time(s).
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
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OchkovVF		#15 Posted : 16 October 2023 18:13:21(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		Wunderbar! Send me please the M matrix as sm-file!
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Razonar		#16 Posted : 16 October 2023 18:48:56(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,356 Was thanked: 815 time(s) in 516 post(s)		Originally Posted by: OchkovVF And what about 3D fitting in SMath? See please my old problem in Mathcad http://twt.mpei.ac.ru/ochkov/car/c_e.html Online calculation http://twt.mpei.ac.ru/MCS/Worksheets/old-car.xmcd Another way, from the same previous post . fit cars.sm (84kb) downloaded 7 time(s). Best regards. Alvaro.
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OchkovVF		#17 Posted : 16 October 2023 19:45:10(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		Thanks! But the last plot must be so
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mkraska		#18 Posted : 16 October 2023 21:32:33(UTC)
Rank: Advanced Member Groups: Registered Joined: 15/04/2012(UTC) Posts: 1,988 Was thanked: 1124 time(s) in 721 post(s)		Originally Posted by: OchkovVF Wunderbar! Send me please the M matrix as sm-file! The data is from your website. I copy-pasted the table to a new text file and imported it. Just use the files provided in my post. As to the last plot: I guess the mileage limits of the individual lines are taken from the minimum and maximum slope observed in the age-mileage plot (fig.2 in your reference)? Do you see any particular problem or do you just want the work getting done?
		Martin Kraska Pre-configured portable distribution of SMath Studio: https://smath.com/wiki/SMath_with_Plugins.ashx
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OchkovVF		#19 Posted : 17 October 2023 00:38:46(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 06/04/2023(UTC) Posts: 339 Was thanked: 26 time(s) in 25 post(s)		do you just want the work getting done? Yes ;-)
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Jean Giraud		#20 Posted : 17 October 2023 06:58:58(UTC)
Rank: Guest Groups: Registered Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)		Global fit Cholesky Frequently, you can manage the Phi vector for a best regional fit. Project fit cars Cholesky.sm (20kb) downloaded 3 time(s).
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