inv_coeff

Arguments

C

a big matrix of the coefficients

d

a polynomial matrix degree. The optional parameter with default value d=-1+size(C,'c')/size(C,'r')

name

a string giving the polynomial variable name (default value 'x').

Description

P=inv_coeff(Mp,k), when k is compatible with Mp size, returns a polynomial matrix of degree k. C=[C0,C1,...,Ck] and P= C0 + C1*x +... +Ck*x^k.

Examples

A=int(10*rand(2,6))
// Building a degree 1 polynomial matrix
P=inv_coeff(A,1)
norm(coeff(P)-A)
// Using default value for degree
P1=inv_coeff(A)
norm(coeff(P1)-A)

See also

• poly — Polynomial definition from given roots or coefficients, or characteristic to a square matrix.
• degree — degree of polynomial matrix
• coeff — coefficients of matrix polynomial