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control.nichols_grid

control.nichols_grid(cl_mags=None, cl_phases=None, line_style='dotted', ax=None, label_cl_phases=True)[source]

Plot Nichols chart grid.

Plots a Nichols chart grid on the current axes, or creates a new chart if no plot already exists.

Parameters:

cl_magsarray_like (dB), optional: Array of closed-loop magnitudes defining the iso-gain lines on a custom Nichols chart.
cl_phasesarray_like (degrees), optional: Array of closed-loop phases defining the iso-phase lines on a custom Nichols chart. Must be in the range -360 < cl_phases < 0
line_stylestring, optional: Matplotlib linestyle.
axmatplotlib.axes.Axes, optional: Axes to add grid to. If None, use matplotlib.pyplot.gca.
label_cl_phasesbool, optional: If True, closed-loop phase lines will be labeled.

Returns:

cl_mag_lineslist of matplotlib.line.Line2D: The constant closed-loop gain contours.
cl_phase_lineslist of matplotlib.line.Line2D: The constant closed-loop phase contours.
cl_mag_labelslist of matplotlib.text.Text: Magnitude contour labels; each entry corresponds to the respective entry in cl_mag_lines.
cl_phase_labelslist of matplotlib.text.Text: Phase contour labels; each entry corresponds to the respective entry in cl_phase_lines.

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