dcfe (NGMV Control Toolbox)

NGMV Control Toolbox

dcfe

Common factor extraction for discrete-time polynomials

Syntax

```
[A0,B0,D,D0] = DCFE(A,B)
```

Description

The function extracts the common factor D of the discrete-time polynomials A and B, and converts it to the stable form D0. A0 and B0 are the resulting coprime polynomials. This function is used before a spectral factorization routine.

Examples

Say and :

a = conv([1 -0.5],[1 -3]);
b = conv([1 0.2],[1 -3]);
[a0,b0,d0] = dcfe(a,b)
a0 =
 1.0000 -0.5000
b0 =
 1.0000 0.2000
d =
 1 -3

d0 =
 3 -1

See Also

cfe

cfe dcgain2