Defining an arbitrary polynomial

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Jeremy
Jeremy 2012-2-16
I am writing a function and it has to work for any polynomial so I was wondering how I could write a code that represents all polynomials

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回答（2 个）

Friedrich
Friedrich 2012-2-16
Hi,
have a look at the polynomial function from MATLAB:
http://www.mathworks.com/help/techdoc/ref/f16-5872.html#f16-6325
In general you store the coefficients only, so the vector [3,2,1] would represent 3x^2+2x+1. The rest can be done with the function from MATLAB, e.g. polyval
Walter Roberson
Walter Roberson 2012-2-16
The Symbolic Math Toolbox has DOM_poly, objects of type 'polynomial', and there is the MuPAD-level function poly() to construct such objects. The facilities include the ability to designate the ring over which the arithmetic is to be done, so you can (for example) construct a polynomial over (say) GF(4), Galois Field 4. The routine Friedrich referred you to is for real-valued polynomials only and so is not suitable for your goal of writing code that represents all polynomials

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