Revert changes to text_demo

048cafd2c17219d0e47d90aa073f90d516902a02
commit 048cafd2c17219d0e47d90aa073f90d516902a02
diff --git a/examples/text_labels_and_annotations/tex_demo.py b/examples/text_labels_and_annotations/tex_demo.py
@@ -1,34 +1,35 @@
 """
-========
-Tex Demo
-========
+=================================
+Rendering math equation using TeX
+=================================
 
 You can use TeX to render all of your matplotlib text if the rc
 parameter text.usetex is set.  This works currently on the agg and ps
 backends, and requires that you have tex and the other dependencies
 described at http://matplotlib.org/users/usetex.html
 properly installed on your system.  The first time you run a script
 you will see a lot of output from tex and associated tools.  The next
-time, the run may be silent, as a lot of the information is cached in
-~/.tex.cache
+time, the run may be silent, as a lot of the information is cached.
+
+Notice how the the label for the y axis is provided using unicode!
 
 """
+from __future__ import unicode_literals
 import numpy as np
+import matplotlib
+matplotlib.rcParams['text.usetex'] = True
+matplotlib.rcParams['text.latex.unicode'] = True
 import matplotlib.pyplot as plt
 
 
-plt.rc('text', usetex=True)
-plt.rc('font', family='serif')
-plt.figure(1, figsize=(6, 4))
-ax = plt.axes([0.1, 0.1, 0.8, 0.7])
 t = np.linspace(0.0, 1.0, 100)
 s = np.cos(4 * np.pi * t) + 2
-plt.plot(t, s)
 
-plt.xlabel(r'\textbf{time (s)}')
-plt.ylabel(r'\textit{voltage (mV)}', fontsize=16)
-plt.title(r"\TeX\ is Number $\displaystyle\sum_{n=1}^\infty"
-          r"\frac{-e^{i\pi}}{2^n}$!", fontsize=16, color='r')
-plt.grid(True)
-plt.savefig('tex_demo')
+fig, ax = plt.subplots(figsize=(6, 4), tight_layout=True)
+ax.plot(t, s)
+
+ax.set_xlabel(r'\textbf{time (s)}')
+ax.set_ylabel('\\textit{Velocity (\N{DEGREE SIGN}/sec)}', fontsize=16)
+ax.set_title(r'\TeX\ is Number $\displaystyle\sum_{n=1}^\infty'
+             r'\frac{-e^{i\pi}}{2^n}$!', fontsize=16, color='r')
 plt.show()