# 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)

### See also

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