control.gangof4_plot

control.gangof4_plot(*args, omega=None, omega_limits=None, omega_num=None, Hz=False, **kwargs)

Plot the response of the “Gang of 4” transfer functions for a system.

Plots a 2x2 frequency response for the “Gang of 4” sensitivity functions [T, PS; CS, S]. Can be called in one of two ways:

gangof4_plot(response[, …]) gangof4_plot(P, C[, …])

Parameters

• response (FrequencyPlotData) – Gang of 4 frequency response from gangof4_response.

• P (LTI) – Linear input/output systems (process and control).

• C (LTI) – Linear input/output systems (process and control).

• omega (array) – Range of frequencies (list or bounds) in rad/sec.

• omega_limits (array_like of two values) – Set limits for plotted frequency range. If Hz=True the limits are in Hz otherwise in rad/s. Specifying omega as a list of two elements is equivalent to providing omega_limits. Ignored if data is not a list of systems.

• omega_num (int) – Number of samples to use for the frequeny range. Defaults to config.defaults[‘freqplot.number_of_samples’]. Ignored if data is not a list of systems.

• Hz (bool, optional) – If True, when computing frequency limits automatically set limits to full decades in Hz instead of rad/s.

Returns

cplt –

Object containing the data that were plotted:

• cplt.lines: 2x2 array of matplotlib.lines.Line2D objects for each line in the plot. The value of each array entry is a list of Line2D objects in that subplot.

• cplt.axes: 2D array of matplotlib.axes.Axes for the plot.

• cplt.figure: matplotlib.figure.Figure containing the plot.

• cplt.legend: legend object(s) contained in the plot

See ControlPlot for more detailed information.

Return type

ControlPlot object