Re: How to force an expression into Rational Function form?

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg1573] Re: How to force an expression into Rational Function form?*From*: danl (Daniel Lichtblau)*Date*: Sat, 1 Jul 1995 02:28:05 -0400*Organization*: Wolfram Research, Inc.

In article <3sg3p4$8cq at news0.cybernetics.net> bracken at kevily.ECE.CMU.EDU (J Eric Bracken) writes: > > 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 > In[10]:= Together[a/b+c/d] // InputForm Out[10]//InputForm= (b*c + a*d)/(b*d) Daniel Lichtblau WRI