The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Finding roots of cubic symbolic polynomials
Replies: 8   Last Post: Aug 13, 2014 10:54 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Steven Lord

Posts: 2,237
Registered: 9/26/13
Re: Finding roots of cubic symbolic polynomials
Posted: Aug 13, 2014 9:38 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Sanaa " <> wrote in message
> "Nasser M. Abbasi" wrote in message <lsflaa$k11$>...
>> 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*mu-segma*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
To contact Technical Support use the Contact Us link on

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.