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MathGroup Archive 2005

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Re: Re: can anyone solve this equation?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg58181] Re: [mg58159] Re: can anyone solve this equation?
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Tue, 21 Jun 2005 06:02:59 -0400 (EDT)
  • References: <d8rhj9$i7n$1@smc.vnet.net> <200506200952.FAA26966@smc.vnet.net>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

I agree that subscripted expressions look better. However, I run into
many instances where Mathematica does not treat subscripted variables
as symbols. Notation commands with appropriate pattern matching can
take care of converting the unbracketed expressions to more easily
readable ones, but I didn't want to complicate the situation any more
than it already was.

Sincere thanks to both Paul and Pratik for the solutions; I will be
testing them shortly.

On 6/20/05, Paul Abbott <paul at physics.uwa.edu.au> wrote:
> In article <d8rhj9$i7n$1 at smc.vnet.net>,
>  Chris Chiasson <chris.chiasson at gmail.com> wrote:
> 
> > Can anyone solve the following equation (for theta_4)?
> 
> Essentially, you are solving the equation
> 
>   FullSimplify[Solve[a - Cos[t] - Sqrt[R^2 - Sin[t]^2] == x, t]]
> 
> where x = 2 n rhs/d is a constant multiple of your right-hand side, rhs,
> t is theta_4, and a = R + 2/(c - 1) + 1. This is, of course, trivial. I
> expect that Solve struggles with your expression because of the length
> and/or complexity of rhs.
> 
> To me, using \[UnderBracket] makes your input expression unreadable.
> Only an engineer would work with such expressions!
> 
> Personally, I like using subscripted expressions in Mathematica. They
> are not without their difficulties and subtleties -- but are preferable
> to using \[UnderBracket].
> 
> Cheers,
> Paul
> 
> --
> Paul Abbott                                      Phone: +61 8 6488 2734
> School of Physics, M013                            Fax: +61 8 6488 1014
> The University of Western Australia         (CRICOS Provider No 00126G)
> AUSTRALIA                               http://physics.uwa.edu.au/~paul
>         http://InternationalMathematicaSymposium.org/IMS2005/
> 
> 


-- 
Chris Chiasson
http://chrischiasson.com/
1 (810) 265-3161


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