
Re: Finding roots of cubic symbolic polynomials
Posted:
Aug 13, 2014 10:19 AM


"Sanaa " <findingsanaa@yahoo.com> wrote in message news:lsfq53$on1$1@newscl01ah.mathworks.com... > "Steven Lord" <Steven_Lord@mathworks.com> wrote in message > <lsfpp6$nim$1@newscl01ah.mathworks.com>... >> >> "Sanaa " <findingsanaa@yahoo.com> wrote in message >> news:lsfopu$kg6$1@newscl01ah.mathworks.com... >> > "Nasser M. Abbasi" wrote in message <lsflaa$k11$1@speranza.aioe.org>... >> >> On 8/13/2014 7:08 AM, Sanaa wrote: >> >> > Hi, >> >> > I need to calculate the roots of a cubic symbolic polynomials. It >> >> > contains 7 parameters. >> >> > Any help is appreciated. >> >> > Thank you >> >> > >> >> >> >> help solve >> > I have tried this, but it asks about segma? >> > function sols = solve_cubic( segma, beta, mu, nu, delta, gamma) >> > syms lambda sols = >> > solve(lambda^3+lambda^2*(nu*mu+delta*mu+gamma*mu+segma*beta*mu+mu^2)+lambda*(delta*mu^2+gamma*mu^2+nu*gamma*mu+segma*gamma*musegma*mu*beta)) >> > end >> >> Show the group EXACTLY how you called solve_cubic and the FULL text of >> any error or warning messages you received. The group should be able to >> call solve_cubic using ONLY your instructions on how to call it. >> >>  >> Steve Lord >> slord@mathworks.com >> To contact Technical Support use the Contact Us link on >> http://www.mathworks.com > > In the command window, I typed > sols = solve_cubic( segma, beta, mu, nu, delta, gamma)
When I execute that command, I receive this error:
>> sols = solve_cubic( segma, beta, mu, nu, delta, gamma) Undefined function or variable 'segma'.
Therefore you have NOT given the group enough instructions to call solve_cubic as I requested. Until you do, I don't think anyone in the group can help you.
 Steve Lord slord@mathworks.com To contact Technical Support use the Contact Us link on http://www.mathworks.com

