  Rank: Advanced Member Groups: Registered
Joined: 24/10/2009(UTC) Posts: 52  Location: Denmark
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How do I compare two formulas?
Like, if I simplify by hand, or solve for x by hand - and I'd like to check if I did it correctly.
What I want to compare, are two equations...
For example:
y = ax + b
And then compare to:
x = (y - b ) / a
And have it reply with "True".
As compared to if I wrote x = (- y - b ) / - a
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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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Helo Mike, At the moment, for this kind of problem you have to use some CAS (Maxima maybe?) Code:
Solve over x
>:: sol1:=solve(y=a*x+b,x)
y - b
[x = -----]
a
Solved by hand
>:: sol2:=(-y-b)/a
- y - b
-------
a
Compared
>:: if(at(x,sol1)=sol2) then "true" else "false"
false
Compared
>:: if(at(x,sol1)=(y-b)/a) then "true" else "false"
true
Regards, Radovan Edited by user 03 May 2010 13:04:02(UTC)
| Reason: Not specified |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Advanced Member Groups: Registered
Joined: 24/10/2009(UTC) Posts: 52 Location: Denmark
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Ah, so it is not possible :P Thanks for reply 
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 Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616  Was thanked: 1978 time(s) in 666 post(s)
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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, I was thinking in this direction, but unfortunately this is not so simple. Please see the examples. Wrong answer "true", it should be "false":  Neither "true" nor "false". If statement needs the numerical result of the logical contidion.  Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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Rank: Administration Groups: Developers, Registered, Knovel Developers, Administrators, Advanced Member Joined: 11/07/2008(UTC) Posts: 1,616 Was thanked: 1978 time(s) in 666 post(s)
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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 Andrey, Yes, I think you are right  . We were thinking on the same thing at this very moment. Regards, Radovan |
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!" |
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