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Arrow head length and head width option is added in nyquist_plot function #379

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Merged
murrayrm merged 7 commits into from
Mar 18, 2020
Merged

Arrow head length and head width option is added in nyquist_plot function #379

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b28e9ab
Nyquist_plot changed to accommodate arrow size
geekonloose Mar 4, 2020
a4f2d25
color option is added
geekonloose Mar 4, 2020
f5f05bd
formatting
geekonloose Mar 4, 2020
5de0899
formatting is retained
geekonloose Mar 5, 2020
8f8565b
line formatting corrected
geekonloose Mar 5, 2020
1f4885d
again line formatting
geekonloose Mar 5, 2020
7c96781
hl changed to arrowhead_width and hw changed to arrowhead_length
geekonloose Mar 5, 2020
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13 changes: 9 additions & 4 deletions control/freqplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -433,8 +433,9 @@ def gen_zero_centered_series(val_min, val_max, period):
# Nyquist plot
#

def nyquist_plot(syslist, omega=None, Plot=True, color=None,
labelFreq=0, *args, **kwargs):
def nyquist_plot(syslist, omega=None, Plot=True,
labelFreq=0, arrowhead_length=0.1, arrowhead_width=0.1,
color=None, *args, **kwargs):
"""
Nyquist plot for a system

Expand All @@ -452,6 +453,8 @@ def nyquist_plot(syslist, omega=None, Plot=True, color=None,
Used to specify the color of the plot
labelFreq : int
Label every nth frequency on the plot
arrowhead_width : arrow head width
arrowhead_length : arrow head length
*args
Additional arguments for :func:`matplotlib.plot` (color, linestyle, etc)
**kwargs:
Expand Down Expand Up @@ -511,12 +514,14 @@ def nyquist_plot(syslist, omega=None, Plot=True, color=None,
ax = plt.gca()
# Plot arrow to indicate Nyquist encirclement orientation
ax.arrow(x[0], y[0], (x[1]-x[0])/2, (y[1]-y[0])/2, fc=c, ec=c,
head_width=0.2, head_length=0.2)
head_width=arrowhead_width,
head_length=arrowhead_length)

plt.plot(x, -y, '-', color=c, *args, **kwargs)
ax.arrow(
x[-1], -y[-1], (x[-1]-x[-2])/2, (y[-1]-y[-2])/2,
fc=c, ec=c, head_width=0.2, head_length=0.2)
fc=c, ec=c, head_width=arrowhead_width,
head_length=arrowhead_length)

# Mark the -1 point
plt.plot([-1], [0], 'r+')
Expand Down