File:Mpl example polar plot.svg
Summary
| Description |
English: Logarithmic spiral with matplotlib |
| Date | |
| Source | Own work |
| Author | Adrien F. Vincent |
Rationale: this work aims at providing an up-to-date version of the previous work https://commons.wikimedia.org/wiki/File:Logarithmic_Spiral_Pylab.svg , done by Morn the Gorn.
The matplotlib (mpl) version is 1.5.3, with Python 2.7 and numpy 1.10
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## Code for the figure
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import matplotlib.pyplot as plt
import numpy as np
from matplotlib.ticker import NullFormatter # empty strings as tick labels
# Set up a figure with a polar projection
fig = plt.figure(figsize=(6, 6))
fig.clf()
ax = fig.add_subplot(1, 1, 1, polar=True)
# Plot a logarithmic spiral
t = np.arange(-4 * np.pi, 4 * np.pi, 0.1)
ax.plot(t, 1.19**t, linewidth=2) # one could also use `plt.polar`
# One wants a grid but without any tick label
ax.xaxis.set_major_formatter(NullFormatter())
ax.yaxis.set_major_formatter(NullFormatter())
ax.grid(True, ls='solid', color='0.75')
fig.savefig('logarithmic_spiral.svg')
plt.show()
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Licensing
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