**polynomial_conversion**,
a Octave code which
converts representations of a polynomial between monomial, Bernstein,
Chebyshev, Gegenbauer, Hermite, Laguerre and Legendre forms.

The monomial or power sum representation of a polynomial of degree n involves a vector a of coefficients, and has the form:

p(x) = a(0) + a(1) * x + a(2) * x^2 + ... + a(n) * x^nA Chebyshev representation, for instance, will use a different vector c of coefficients, and Chebyshev basis functions T(x) so that

p(x) = c(0) T0(x) + c(1) * T1(x) + c(2) * T2(x) + ... + c(n) * Tn(x)

It is the task of this software to take the coefficients for one representation, and determine the corresponding coefficients in another specified representation.

The information on this web page is distributed under the MIT license.

**polynomial_conversion** is available in
a C version and
a C++ version and
a Fortran77 version and
a Fortran90 version and
a MATLAB version and
a Octave version and
a Python version.

bernstein_polynomial, a Octave code which evaluates the Bernstein polynomials, useful for uniform approximation of functions;

chebyshev_polynomial, a Octave code which considers the Chebyshev polynomials T(i,x), U(i,x), V(i,x) and W(i,x). Functions are provided to evaluate the polynomials, determine their zeros, produce their polynomial coefficients, produce related quadrature rules, project other functions onto these polynomial bases, and integrate double and triple products of the polynomials.

hermite_polynomial, a Octave code which evaluates the physicist's Hermite polynomial, the probabilist's Hermite polynomial, the Hermite function, and related functions.

laguerre_polynomial, a Octave code which evaluates the Laguerre polynomial, the generalized Laguerre polynomial, and the Laguerre function.

legendre_polynomial, a Octave code which evaluates the Legendre polynomial and associated functions.

test_matrix, a Octave code which defines test matrices for which the condition number, determinant, eigenvalues, eigenvectors, inverse, null vectors, P*L*U factorization or linear system solution are known. Examples include the Fibonacci, Hilbert, Redheffer, Vandermonde, Wathen and Wilkinson matrices.

- bernstein_to_legendre01.m, converts a Bernstein representation to Legendre01 representation;
- bernstein_to_legendre01_matrix.m, Bernstein-to-Legendre01 matrix.
- bernstein_to_monomial.m, converts a Bernstein representation to monomial representation;
- bernstein_to_monomial_matrix.m, Bernstein-to-monomial matrix.
- chebyshev_to_monomial.m, converts a Chebyshev representation to monomial representation;
- chebyshev_to_monomial_matrix.m, Chebyshev-to-monomial matrix (Chebyshev T polynomial).
- gegenbauer_to_monomial.m, converts a Gegenbauer representation to monomial representation.
- gegenbauer_to_monomial_matrix.m, Gegenbauer-to-monomial matrix.
- hermite_to_monomial.m, converts a Hermite representation to monomial representation;
- hermite_to_monomial_matrix.m, Hermite-to-monomial matrix.
- laguerre_to_monomial.m, converts a Laguerre representation to monomial representation;
- laguerre_to_monomial_matrix.m, Laguerre-to-monomial matrix;
- legendre_to_monomial.m, converts a Legendre representation to monomial representation;
- legendre_to_monomial_matrix.m, Legendre-to-monomial matrix;
- legendre01_to_bernstein.m, converts a Legendre01 representation to Bernstein representation;
- legendre01_to_bernstein_matrix.m, Legendre01-to-Bernstein matrix;
- monomial_to_bernstein.m, converts a monomial representation to Bernstein representation;
- monomial_to_bernstein_matrix.m, monomial-to-Bernstein matrix;
- monomial_to_chebyshev.m, converts a monomial representation to Chebyshev representation;
- monomial_to_chebyshev_matrix.m, monomial-to-Chebyshev matrix (Chebyshev T polynomial);
- monomial_to_gegenbauer.m, converts monomial representation to Gegenbauer representation;
- monomial_to_gegenbauer_matrix.m, monomial-to-Gegenbauer matrix;
- monomial_to_hermite.m, converts a monomial representation to Hermite representation;
- monomial_to_hermite_matrix.m, monomial-to-Hermite matrix;
- monomial_to_laguerre.m, converts a monomial representation to Laguerre representation;
- monomial_to_laguerre_matrix.m, monomial-to-Laguerre matrix;
- monomial_to_legendre.m, converts a monomial representation to Legendre representation;
- monomial_to_legendre_matrix.m, monomial-to-Legendre matrix;