4th degree equations
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
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 Kommentare
Akzeptierte Antwort
Walter Roberson
am 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 Kommentare
Walter Roberson
am 19 Nov. 2011
I think I do not know enough polynomial theory to come up with a useful answer on this, sorry.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Linear Algebra finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!