— Function File: [a, b, c, d, tsam, n, nz, stname, inname, outname, yd] = sys2ss (sys)

Extract state space representation from system data structure.

Input

sys

System data structure.

Outputs

a

b

c

d

State space matrices for sys.

tsam

Sampling time of sys (0 if continuous).

n

nz

Number of continuous, discrete states (discrete states come last in state vector x).

stname

inname

outname

Signal names (lists of strings); names of states, inputs, and outputs, respectively.

yd

Binary vector; yd(ii) is 1 if output y(ii) is discrete (sampled); otherwise yd(ii) is 0.

A warning massage is printed if the system is a mixed continuous and discrete system.

Example

          octave:1> sys=tf2sys([1 2],[3 4 5]);
          octave:2> [a,b,c,d] = sys2ss(sys)
          a =
          0.00000   1.00000
          -1.66667  -1.33333
          b =
          0
          1
          c = 0.66667  0.33333
          d = 0