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Polynomials

Curve fitting, roots, partial fraction expansions

Polynomials are equations of a single variable with nonnegative integer exponents. MATLAB® represents polynomials with numeric vectors containing the polynomial coefficients ordered by descending power. For example, [1 -4 4] corresponds to x2 - 4x + 4. For more information, see Create and Evaluate Polynomials.

Functions

poly Polynomial with specified roots or characteristic polynomial
polyeig Polynomial eigenvalue problem
polyfit Polynomial curve fitting
residue Partial fraction expansion (partial fraction decomposition)
roots Polynomial roots
polyval Polynomial evaluation
polyvalm Matrix polynomial evaluation
conv Convolution and polynomial multiplication
deconv Deconvolution and polynomial division
polyint Polynomial integration
polyder Polynomial differentiation

Topics

Create and Evaluate Polynomials

This example shows how to represent a polynomial as a vector in MATLAB® and evaluate the polynomial at points of interest.

Roots of Polynomials

Calculate polynomial roots numerically, graphically, or symbolically.

Integrate and Differentiate Polynomials

This example shows how to use the polyint and polyder functions to analytically integrate or differentiate any polynomial represented by a vector of coefficients.

Polynomial Curve Fitting

This example shows how to fit a polynomial curve to a set of data using polyfit.

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