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 elis02 #1 Posted : 02 November 2023 03:42:25(UTC) Rank: NewbieGroups: Registered Joined: 02/11/2023(UTC)Posts: 1 test_s_math.sm (10kb) downloaded 7 time(s).Hi I'm trying to solve an equation (see in the attached file) where the solution , the number should be small but for some reason which i can't understand , the app doesn't provide me a solution. Why is that?P.SI'm new to Smath but it seems like it can help a lot with calculations.
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 oscampo #2 Posted : 02 November 2023 05:59:25(UTC) Rank: Advanced MemberGroups: Registered Joined: 10/12/2009(UTC)Posts: 250Location: Cali, ColombiaWas thanked: 89 time(s) in 68 post(s) Hi Elis02, Native solve() is nota robust solver, so it's convenient use functions as Solve() from Maxima plugin or FindRoot() from Non Linear Solvers plugin.You need provide a value to x(t) for asking for a value of t that satisfies the equation, in the form "x(t)=k, t" where k is the value you expect obtain when replace for t:Best,Oscar
 overlord #3 Posted : 02 November 2023 06:09:46(UTC) Rank: Advanced MemberGroups: Registered Joined: 23/07/2013(UTC)Posts: 1,133Was thanked: 516 time(s) in 344 post(s) Numeric solvers don't like units.Either don't use them or add units to solvers.Entering a range/interval will help for solve().Findroot() won't need unit addition btw.Regards test_s_math_solved.sm (13kb) downloaded 7 time(s). 2 users thanked overlord for this useful post. on 02/11/2023(UTC),  on 03/11/2023(UTC)
 overlord #4 Posted : 03 November 2023 08:32:22(UTC) Rank: Advanced MemberGroups: Registered Joined: 23/07/2013(UTC)Posts: 1,133Was thanked: 516 time(s) in 344 post(s) Jean has ignored units, manually input E1.As usual, these made him totally wrong.He doesn't have correct answer.This is Jean's plot;This what it should be;If you don't know, then don't say.Your mistakes are harming this community. 3 users thanked overlord for this useful post. on 03/11/2023(UTC),  on 03/11/2023(UTC),  on 03/11/2023(UTC)
 Jean Giraud #5 Posted : 03 November 2023 23:09:30(UTC) Rank: GuestGroups: Registered Joined: 04/07/2015(UTC)Posts: 6,866Was thanked: 981 time(s) in 809 post(s) Windows handles arithmetic [+,-,*,/] in the range 10^ ± 307.Your ^-19 is so small that the quadratic term vanishes.What's left is the linear term and the shift system.On the other hand, some function may be granular.Granular in the sense that they many not compute exactly.The one best known from Mathematica.Jean
 overlord #6 Posted : 04 November 2023 00:17:56(UTC) Rank: Advanced MemberGroups: Registered Joined: 23/07/2013(UTC)Posts: 1,133Was thanked: 516 time(s) in 344 post(s) Originally Posted by: Jean Giraud Windows handles arithmetic [+,-,*,/] in the range 10^ ± 307.Your ^-19 is so small that the quadratic term vanishes.No it doesn't vanishes.You are simply not capable to work with units.Anything involves physical quantities, you are wrong there.This is not the first you act like a buffoon.You couldn't write a simple formula, admit it.In fact, you are a horribly wretched engineer.Jean, look and learn. This is how you eliminate units.Btw, why did you delete all your meaningless replies?Can you see the problem Jean?You forgot your unit conversions.m_Ar and E1 needs magick numbers in your approach.If you would capable to work with units, no coefficients needed.Everything is simple, clean, easier to apprehend, much easier to manipulate with units.Edited by user 04 November 2023 00:45:39(UTC)  | Reason: Not specified 2 users thanked overlord for this useful post. on 04/11/2023(UTC),  on 04/11/2023(UTC)
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