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Transfer function system interface functions

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

[num den, tsam, inname, outname] = sys2tf (sys) Function File
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> [numden] = sys2tf(sys)
          num = 1.0000  -3.0000
          den = 1.0000   1.1000  -4.3000