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Fix #2156 code of Bloch animation in doc #2409

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May 1, 2024
Merged

Fix #2156 code of Bloch animation in doc #2409

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Fix #2156 code of Bloch animation in doc
PositroniumJS Apr 25, 2024
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Add towncrier entry
PositroniumJS Apr 25, 2024
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2 changes: 2 additions & 0 deletions doc/changes/2409.doc
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix #2156
Correct a sample of code in the doc
12 changes: 3 additions & 9 deletions doc/guide/guide-bloch.rst
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Expand Up @@ -323,25 +323,19 @@ Directly Generating an Animation
The code to directly generate an mp4 movie of the Qubit decay is as follows ::

from matplotlib import pyplot, animation
from mpl_toolkits.mplot3d import Axes3D

fig = pyplot.figure()
ax = Axes3D(fig, azim=-40, elev=30)
ax = fig.add_subplot(azim=-40, elev=30, projection="3d")
sphere = qutip.Bloch(axes=ax)

def animate(i):
sphere.clear()
sphere.add_vectors([np.sin(theta), 0, np.cos(theta)])
sphere.add_vectors([np.sin(theta), 0, np.cos(theta)], ["r"])
sphere.add_points([sx[:i+1], sy[:i+1], sz[:i+1]])
sphere.make_sphere()
return ax

def init():
sphere.vector_color = ['r']
return ax

ani = animation.FuncAnimation(fig, animate, np.arange(len(sx)),
init_func=init, blit=False, repeat=False)
ani = animation.FuncAnimation(fig, animate, np.arange(len(sx)), blit=False, repeat=False)
ani.save('bloch_sphere.mp4', fps=20)

The resulting movie may be viewed here: `bloch_decay.mp4 <https://raw.githubusercontent.com/qutip/qutip/master/doc/figures/bloch_decay.mp4>`_