MATLAB: Does MATLAB allow us to define a polynomial with unknown coeffcients

MATLABpolynomialsunknown coefficients

Hi does MATLAB allow us to define a polynomial with unknown coefficients? I know the function poly2sym where we enter the array of coefficients as an input. But if I do not have coefficients? I actually need to define two polynomials with unknown coefficients and then equate their product to 1 to find all the coefficients. I know only one of the coefficients in one of the polynomials.

Best Answer

syms x
a = sym('a', [3 1]);
a(3)*x^2+a(2)*x+a(1)

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MATLAB: How to get the coefficients of the minimal polynomial

Hi Palash,

I think the following MATLAB function could do the job for your problem:

function p = minpoly(A)
p = evalin(symengine, ['map(poly2list(linalg::minpoly(' char(sym(A)) ',x)),c->c[1])']);
end

If you add it in MATLAB to your path, then you can call it via:

>> A = [1 -1 -1; 1 -2 1; 0 1 -3]; % minimal polynomial is x^3 + 4*x^2 + x - 1
>> minpoly(A)
ans =
[ 1, 4, 1, -1]

Hope this helps. Inside of MuPAD the function 'poly2list' converts polynomials to a nested list representation containing the information on the coefficients of polynomials.

Best regards,

-- Kai

MATLAB: How to get the Coeffcient value

y = 4;
xout = roots([3,2,4 - y])

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MATLAB: How to get the coefficients of the minimal polynomial

MATLAB: How to get the Coeffcient value

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