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I'm using matplotlib 1.0.1. Run the following with bug = True and bug = False:
import numpy as N
from matplotlib import pyplot as P
x = N.linspace(0, 1, 10)
y = N.linspace(0, 1, 10)
angles = N.linspace(0, 360, 10)
angles_copy = angles.copy()
P.quiver(x, y, 1, 0, angles=angles)
if bug:
P.savefig('bug.pdf')
print 'array unchanged:', (angles == angles_copy).all()
P.show()The array is unchanged and the plot shows correctly if savefig() is not called. If it is, then the angles array is changed; numpy.degrees() is run on it, and the plot shows up with arrows at incorrect angles. However, the arrows are correctly rendered in the PDF file.
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