3  Statespace

pkg load ocontrol
pkg list ocontrol

Package Name  | Version | Installation directory
--------------+---------+-----------------------
    ocontrol *|  10.1.0 | .../share/octave/api-v57/packages/ocontrol-10.1.0

A = [1, 0; -1, -1];
B = [0; 1];
C = [0, 1];
D = 0;

G = ss (0, A, B, C, D)

G =     A =

       1   0
      -1  -1

    B =

       0
       1

    C =

       0   1

    D = 0
    delay = 0
    type = SS
    sampleTime = 0

step(G);

Time assumed to be 10 seconds