FREQ(G)

NAME
freq - frequency response

CALLING SEQUENCE
[x]=freq(A,B,C [,D],f)
[x]=freq(NUM,DEN,f)

PARAMETERS

A, B, C, D
    : real matrices of respective dimensions nxn, nxp, mxn, mxp.

NUM,DEN
    : polynomial matrices of dimension mxp

x   : real or complex matrix

DESCRIPTION
x=freq(A,B,C [,D],f) returns a real or complex mxp*t matrix such that:

x(:,k*p:(k+1)*p)= C*inv(f(k)*eye-A)*B + D.

Thus, for f taking values along the imaginary axis or on the unit circle x is the continous or discrete time frequency response of (A,B,C,D).

x=freq(NUM,DEN,f) returns a real or complex matrix x such that columns k*(p-1)+1 to k*p of x contain the matrix NUM(f(k))./DEN(f(k))

SEE ALSO
repfreq, horner.