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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

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Nasser Abbasi

Posts: 5,146
Registered: 2/7/05
Re: get coefficients from a symbolic polynomial
Posted: Jan 5, 2013 3:27 PM
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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

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