Octave Control Toolbox: How to find the step response of a given state signal?

[Roque Iozzo]

How to find the step response of a given state signal?

The 'step' function produces a plot or the step response data for a system 
(i.e. y_1), but how can I plot the response of a state signal (i.e. x_1 or x_2)?

> A=[-1 -0.5;1 0];
> B=[0.5;0];
> C=[1 0];
> D=0;
> S=ss(A,B,C,D);
> S

S =
{
  a =

    -1.00000  -0.50000
     1.00000   0.00000

  b =

     0.50000
     0.00000

  c =

     1   0

  d = 0
  n =  2
  nz = 0
  tsam = 0
  yd = 0
  sys =

     2   0   0   1

  stname =

  {
    [1,1] = x_1
    [1,2] = x_2
  }

  inname =

  {
    [1,1] = u_1
  }

  outname =

  {
    [1,1] = y_1
  }

}



----------------------------------------------------------------------
GNU Octave Version 3.0.1
GNU Octave License: GNU General Public License
Operating System: Linux 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686
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