Re: [fricas-devel] Re: Selection of roots
Alejandro Jakubi <[email protected]> Mon, 3 Nov 2008 20:21:27 -0300
| Newsgroups | gmane.comp.mathematics.axiom.general,gmane.comp.mathematics.open-axiom.devel |
|---|---|
| Message-ID | <Pine.WNT.4.64.0811032000570.2608@usuario-de5f78f> |
On Mon, 3 Nov 2008, Martin Rubey wrote: > Alejandro Jakubi <[email protected]> writes: >> Now, my next question is about selecting the two real roots out of the four >> produced by 'radicalSolve' here: >> >> f:=(x^3+x^2-4*x-4)/(2*x^2+7*x-4) >> fp:=differentiate(f,x) >> radicalSolve(fp,x) >> >> The problem is that >> >> allRootsOf(fp)$RealClosure(Fraction Integer) > > try > > allRootsOf(numer fp)$RealClosure(Fraction Integer) > Fine. Now, how I recover the algebraic expressions, as produced by 'radicalSolve', associated with such labels like %A1, %A2 ? Alejandro Jakubi