coff - resolvent (cofactor method)

Calling Sequence

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

Parameters

• 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()-M)
 
  

See Also

coffg ,   ss2tf ,   nlev ,   poly ,