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Scilab help >> Polynomials > coffg

# coffg

inverse of polynomial matrix

[Ns,d]=coffg(Fs)

### Arguments

Fs

square polynomial matrix

### Description

coffg computes Fs^-1 where Fs is a polynomial matrix by co-factors method.

Fs inverse = Ns/d

d = common denominator; Ns = numerator (a polynomial matrix)

(For large matrices,be patient...results are generally reliable)

### Examples

s=poly(0,'s')
a=[ s, s^2+1; s  s^2-1];
[a1,d]=coffg(a);
(a1/d)-inv(a)

### See Also

• determ — determinant of polynomial matrix
• detr — polynomial determinant
• invr — inversion of (rational) matrix
• penlaur — Laurent coefficients of matrix pencil
• glever — inverse of matrix pencil
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