StateSpace

The StateSpace model implements the equation

der(x) = Ax + Bu
    y  = Cx + Du

where

A is an n by n matrix, where n is the number of states,
B is an n by m matrix, where m is the number of inputs,
C is an r by n matrix, where r is the number of outputs,
D is an r by m matrix, and
x0 is the initial value of x