MathGroup Archive 1997

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Re: implizit function

  • To: mathgroup at
  • Subject: [mg5962] Re: [mg5920] implizit function
  • From: seanross at
  • Date: Wed, 5 Feb 1997 21:11:59 -0500
  • Sender: owner-wri-mathgroup at

Vital M. Meyer wrote:
> hi,
> i would like to find the (numerical) solutions of
> y*tan(y)=x
> with mathematica. i don't see how to get it.
> does anybody konw?
> thanks  Vital
> --
> *********************************************************************
> Vital M. Meyer                          vital.meyer at
> ETH Zurich                    
> Institute of Building Technologies
> Chair of Building Physics               Phone: +41 1 633 26 70
> ETH Hoenggerberg                        Fax:   +41 1 633 10 41
> CH-8093 Zurich/Switzerland
> **********************************************************************
> "The square on the hypotenuse equals the sum of the squares of the other
> two sides. The other two sides of WHATH, I never knew." (J. O'Conner)

#1-Have you tried NSolve, FindRoot or a manual implementation of 
Newton-Coates, Newton Raphson, Bisection, etc.?  
#2-It seems that you are trying to use mathematica without benefit of a 
copy of the mathematica book.  Mathematica is a full-blown programming 
language, not just a collection of nifty functions.  Don't be cheap.  Go 
buy a copy of the book and browse it at your leisure.
#3-No numerical programming language is a substitute for a basic 
understanding of numerical methods.  Go to your local college bookstore 
and buy a copy of a numerical methods textbook.  Without any idea of 
what is going on behind the built in routines in mathematica, you run 
the serious risk of having no idea what results you expect or how to 
formulate problems.

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