inv_coeff

Scilab Function
Last update : 25/04/2007

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` ,