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Summary

Description
English: The Poinsot's spiral given by the parametric equation with .
Date
Source Own work
Author Krishnavedala
Other versions File:Poinsot1.PNG
SVG development
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This plot was created with Matplotlib.
Source code
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Python code

Source code 
from numpy import linspace, append
from math import cosh, sin, cos, pi
from matplotlib.pyplot import *
from mpl_toolkits.axes_grid.axislines import SubplotZero

fig = figure(figsize=(4,4))
ax = SubplotZero(fig,111)
fig.add_subplot(ax)
ax.grid(True)
ax.set_ylim(-1,1)
ax.set_xlim(-1,1)
for direction in ["xzero","yzero"]:
	ax.axis[direction].set_axisline_style("-|>")
	ax.axis[direction].set_visible(True)
for direction in ["left","right","bottom","top"]:
	ax.axis[direction].set_visible(False)

theta = linspace(-5*pi,5*pi,150)
X, Y = [],[]
for x in theta:
	X = append(X,cos(x)/cosh(x/3.))
	Y = append(Y,sin(x)/cosh(x/3.))
ax.plot(X,Y)
ax.text(1,0.1,r"x")
ax.text(-0.1,1,r"y")
#fig.show()
fig.savefig("Poinsot1.svg",bbox_inches="tight",\
	pad_inches=.15)

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GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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inception

4 June 2011

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Date/TimeThumbnailDimensionsUserComment
current12:59, 4 June 2011Thumbnail for version as of 12:59, 4 June 2011333 × 343 (20 KB)Krishnavedala{{Information |Description ={{en|1=The Poinsot's spiral given by the parametric equation <math>r = \mathrm{sech}\left(\theta/3\right)</math> with <math>-5\pi\leq\theta\leq5\pi</math>. Created using [[:w:python (programming lan

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