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coff

resolvent (cofactor method)

Syntax

[N,d]=coff(M [,var])

Arguments

M

square real matrix

var

character string

N

polynomial matrix (same size as M)

d

polynomial (characteristic polynomial poly(A,'s'))

Description

coff computes R=(s*eye()-M)^-1 for M a real matrix. R is given by N/d.

N = numerator polynomial matrix.

d = common denominator.

var character string ('s' if omitted)

Examples

M=[1,2;0,3];
[N,d]=coff(M)
N/d
inv(%s*eye(2,2)-M)

See also

  • coffg — Co-factors of a matrix of polynomials or rationals
  • ss2tf — conversion from state-space to transfer function
  • nlev — Leverrier's algorithm
  • poly — Polynomial definition from given roots or coefficients, or characteristic to a square matrix.
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Last updated:
Mon Nov 07 14:58:52 CET 2022