 Rank: Newbie
Groups: Registered
Joined: 23/01/2014(UTC) Posts: 4 
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Hello,
I am very new to Smath Studio and programming in general. I have been able solve systems directly in Maxima, but am having difficulty doing it through the plugin for Smath. Could someone please give me some tips for how to solve a simple system such as a car accelerating from a stop?
Say I know the distance and time that a car accelerates and I want to determine the acceleration and velocity. Obviously this is a very simple example to do by hand, but I want to understand the technique for how to solve this in Smath using Maxima.
Equations:
d=1/2*a*^2
v=sqrt(2*a*d)
Knowns(t,d)
Unknowns(v,a)
Thanks for the help!
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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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Hello,
Just look at the SMath Active Book by Martin Kraska and you will find under Maxima plugin the answer. For instance, you can use Algsys() function
L:Algsys(mat(d≡1/2*a*t^2,v≡sqrt(2*a*d),2,1),mat(v,a,2,1))
Assign(L)=sys(sys(2*abs(d)/abs(t),2*d/{t^2},2,1),1,1)
v={2*abs(d)}/abs(t) a={2*d}/{t^2}
Regards,
Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
 1 user thanked omorr for this useful post.
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Rank: Newbie
Groups: Registered
Joined: 23/01/2014(UTC) Posts: 4
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Great, thank you so much omorr!
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Rank: Newbie
Groups: Registered
Joined: 23/01/2014(UTC) Posts: 4
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I went home and tried using that function tonight and keep getting an error message that the d and v are "not defined". Like I said, I am new to this and I am not quite sure what my mistake is. I really appreciate the help! 
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 Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,985  Was thanked: 1124 time(s) in 721 post(s)
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That is because you try to get a numeric result. If you use -> (evaluate symbolically) then you get the correct result.
You also can switch evaluation mode via context menu (right mouse button), entry "Optimization" |
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1 user thanked mkraska for this useful post.
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Rank: Newbie
Groups: Registered
Joined: 23/01/2014(UTC) Posts: 4
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Wow, thank you both so much! That was super helpful. I need to go brush up on the basics.
Thanks again!
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