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MathGroup Archive 1995

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How to force an expression into Rational Function form?

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1558] How to force an expression into Rational Function form?
  • From: bracken at kevily.ECE.CMU.EDU (J Eric Bracken)
  • Date: Sat, 24 Jun 1995 05:28:55 -0400
  • Organization: Carnegie Mellon University

Is there a way to force a univariate expression into the form
of a rational function (i.e., the ratio of two polynomials)?

Apart[] almost does the job, but if it's able to factor the 
denominator polynomial, it does so, which leaves you with the
SUM of several rational functions.  I want just a single big
rational function.

I guess this is just a special case of the problem of clearing all 
sums of fractions and generating one big fraction; for example,

		a/b + c/d = (ad+bc)/bd

TIA,

--Eric

__________________________________________________________________
     ________   ________   __   ________
    /\_______\ /\_______\ /\_\ /\_______\ J. Eric Bracken, Ph.D.
   / / ______// / ____  // / // / ______/ Visiting Lecturer, Dept. of ECE
  / / /__\   / / /__\/ // / // / /        Carnegie Mellon University
 / / ____/  / / ___  _// / // / /___      Pittsburgh, PA 15213
/ / /____\ / / / \/ / / / // / /____\     (412) 268-8944 FAX (412) 268-3204
\/_______/ \/_/  \/_/ \/_/ \/_______/     eric.bracken at ece.cmu.edu

 http://www.ece.cmu.edu/afs/ece/usr/bracken/.home-page.html
__________________________________________________________________	  



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