def drss(states=1, inputs=1, outputs=1):
"""
Create a stable **discrete** random state space object.
Parameters
----------
states: integer
Number of state variables
inputs: integer
Number of system inputs
outputs: integer
Number of system outputs
Returns
-------
sys: StateSpace
The randomly created linear system
Raises
------
ValueError
if any input is not a positive integer
See Also
--------
rss
Notes
-----
If the number of states, inputs, or outputs is not specified, then the
missing numbers are assumed to be 1. The poles of the returned system
will always have a magnitude less than 1.
"""
return _rss_generate(states, inputs, outputs, 'd')
def drss(states=1, outputs=1, inputs=1):
"""
Create a stable **discrete** random state space object.
Parameters
----------
states: integer
Number of state variables
inputs: integer
Number of system inputs
outputs: integer
Number of system outputs
Returns
-------
sys: StateSpace
The randomly created linear system
Raises
------
ValueError
if any input is not a positive integer
See Also
--------
rss
Notes
-----
If the number of states, inputs, or outputs is not specified, then the
missing numbers are assumed to be 1. The poles of the returned system
will always have a magnitude less than 1.
"""
return _rss_generate(states, inputs, outputs, 'd')
def test_rss_invalid(self, par, errmatch):
"""Test invalid inputs for rss() and drss()."""
with pytest.raises(ValueError, match=errmatch):
_rss_generate(*par)