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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> [num,den] = sys2tf(sys)
num = 1.0000  -3.0000
den = 1.0000   1.1000  -4.3000