Returning polynomial coefficients from matlabFunction as an array

Question

Using symbolic math I generate a polynomial using poly2sim in the following way :

nOrderA=input('Power of=')
A = sym('A', [1 nOrderA])
p = poly2sym(A,x)

This returns a polynomial the order of which is dependent on the user input. In the case of the user input being 3 the output of p is given by

p = (sym)

       2
  A₁₁⋅x  + A₁₂⋅x + A₁₃

I intend to use this output as a function and do this as follows:

F = matlabFunction((p))

This value of F returned is

@(A11, A12, A13, x) A11 .* x .^ 2 + A12 .* x + A13

Here instead of the coefficients A11, A12, A13 as separate inputs to the functions, I would like to have them inputted as an array of coefficients i.e.

the value of F returned should be

 @(A, x) A11 .* x .^ 2 + A12 .* x + A13

where A = [A11,A12,A13]

How should I go about doing this ?

meetaig meetaig · Accepted Answer · 2016-08-25T11:52:39

Use the coeffs function:

C = coeffs(p)

returns coefficients of the polynomial p with respect to all variables determined in p by symvar.

Returning polynomial coefficients from matlabFunction as an array

1 Answers