inv_coeff
inv_coeff — build a polynomial matrix from its coefficients
Calling sequence
[P]=inv_coeff(C,[,d,[name])
Parameters
| C | : big matrix of the coefficients |
| d | : Polynomial matrix degree. optional parameter with default value d=-1+size(C,'c')/size(C,'r') |
| name | : 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, degree, coeff
