我在Mac OS Lion上获得此错误，Python 2.7
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> /usr/local/lib/python2.7/site-packages/matplotlib/text.py:52: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal if rotation in ('horizontal', None):
/usr/local/lib/python2.7/site-packages/matplotlib/text.py:54: UnicodeWarning: Unicode equal comparison failed to convert both arguments to Unicode - interpreting them as being unequal elif rotation == 'vertical':
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from matplotlib import pyplot as plt
from matplotlib import cm # colormaps
import numpy as np
try:
fname = 'solution.txt'
x, y, u = np.loadtxt(fname, unpack=True)
except:
err_msg = "Could not load data from file %s." % fname \
+ " Did you forget to run the program?"
raise Exception(err_msg)
# Solution is plotted on n by n grid so length of each vector should be n**2
# Determine n:
n = int(np.sqrt(len(x)))
assert n*n == len(x), "Expected len(x) to be a perfect square, len(x) = %s" % len(x)
X = x.reshape(n,n)
Y = y.reshape(n,n)
U = u.reshape(n,n)
# Pseudocolor plot
plt.figure(1)
plt.clf() # clear figure
plt.pcolor(X,Y,U,cmap=cm.jet) # pseudo-color plot using colormap "jet"
plt.axis('scaled') # so x- and y-axis scaled the same (square)
plt.clim(0., 1.) # colors range from u=0 to u=1
plt.colorbar() # add a color bar to show temperature scale
plt.title('Temperature')
plt.savefig('pcolor.png')
print 'Saved pseudocolor plot as pcolor.png'
# Contour plot
plt.figure(2)
plt.clf()
# contour line levels:
clines = np.linspace(0., 1., 26)
# do contour plot:
C = plt.contour(X,Y,U,clines,colors='k')
plt.axis('scaled')
# add labels on every other line:
plt.clabel(C, clines[1::2], inline=1, fontsize=10)
plt.title('Contours of temperature')
plt.savefig('contour.png')
print 'Saved contour plot as contour.png'