4th degree equations
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi, can anyone help me with this problem? We need the smallest positive real root of this equation
a*x^4+b*x^3+c*x^2+d*x+e=0,
where a>0, b<0, c>0, d<0 and e>0. As Descartes said, in that case this equation has at least 2 positive real roots.
Thank you for your attention.
0 commentaires
Réponse acceptée
Walter Roberson
le 18 Nov 2011
r = roots([a,b,c,d,e]);
r(imag(r)~=0) = []; %remove complex
r(r <= 0) = []; %remove non-positive
min(r) %now it is the smallest positive real root
5 commentaires
Walter Roberson
le 19 Nov 2011
I think I do not know enough polynomial theory to come up with a useful answer on this, sorry.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Linear Algebra dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!