— Function File: tf2sys (num, den, tsam, inname, outname)

Build system data structure from transfer function format data.

Inputs

num

den

Coefficients of numerator/denominator polynomials.

tsam

Sampling interval; default: 0 (continuous time).

inname

outname

Input/output signal names; may be a string or cell array with a single string entry.

Output

sys

System data structure.

Example

          octave:1> sys=tf2sys([2 1],[1 2 1],0.1);
          octave:2> sysout(sys)
          Input(s)
                  1: u_1
          Output(s):
                  1: y_1 (discrete)
          Sampling interval: 0.1
          transfer function form:
          2*z^1 + 1
          -----------------
          1*z^2 + 2*z^1 + 1
     

— Function File: [num, den, tsam, inname, outname] = sys2tf (sys)

Extract transfer function data from a system data structure.

See tf for parameter descriptions.

Example

          octave:1> sys=ss([1 -2; -1.1,-2.1],[0;1],[1 1]);
          octave:2> [num,den] = sys2tf(sys)
          num = 1.0000  -3.0000
          den = 1.0000   1.1000  -4.3000