Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

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


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

Topic: get coefficients from a symbolic polynomial
Replies: 6   Last Post: Jan 5, 2013 5:49 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Nasser Abbasi

Posts: 5,660
Registered: 2/7/05
Re: get coefficients from a symbolic polynomial
Posted: Jan 5, 2013 3:27 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 1/5/2013 9:49 AM, Qiming wrote:

>
> Note that the entire polynomial is symbolic, that is, even the coefficients 0, 1, 2, 3
>are in symbolic form instead of numbers, so I cannot use 'sym2poly(y)' to get the coefficients.


Can you show why you can't? i.e. show what you tried, and the error you get, as it works for me:

EDU>> syms x
EDU>> y=3*x^3 + 2*x^2 + x;
EDU>> sym2poly(y)

ans =

3 2 1 0


--Nasser




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

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.