Init

plot07a.py

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+# -*- coding: utf-8 -*-
+#from __future__ import unicode_literals
+#import matplotlib.pyplot as plt
+#from sympy import symbols, sqrt
+#from sympy.plotting import plot
+
+#http://www.scipy-lectures.org/intro/matplotlib/matplotlib.html
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+plt.rc('text', usetex=True)
+plt.rc('font', family='serif')
+
+x = np.linspace(-10, 30, 400, endpoint=True)
+
+
+def f(x):
+    with np.errstate(divide='ignore', invalid='ignore'):
+        return np.divide(7,(9-x))
+
+y=f(x)
+
+#plt.plot(X, C)
+
+plt.figure(figsize=(9, 6), dpi=600)
+plt.ylim(-25, 25)
+# plt.xlim(x.min() * 1.1, x.max() * 1.1)
+#
+ax = plt.gca()  # gca stands for 'get current axis'
+ax.spines['right'].set_color('none')
+ax.spines['top'].set_color('none')
+ax.xaxis.set_ticks_position('bottom')
+ax.spines['bottom'].set_position(('data',0))
+ax.yaxis.set_ticks_position('left')
+ax.spines['left'].set_position(('data',0))
+#
+# #x
+# plt.arrow(8.5, -0.003, 0.1, 0, head_width=0.1, head_length=0.25,clip_on=False) #width=0.015, color="k", clip_on=False, head_width=0.12, head_length=0.22)
+#
+# #y
+# plt.arrow(0.0, 8.7, 0, 0.1, clip_on=False, head_width=0.1, head_length=0.25)
+#
+#
+plt.yticks([2,4,6,8])
+plt.xticks([-10,-8,-6,-4,-2,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30])#),rotation='vertical')
+#
+# plt.margins(0.2)
+#
+#
+plt.plot(x, y, color="slateblue")
+#
+# plt.title(r"$\displaystyle y=f\left(t\right)=\frac{7}{9-t}$" ,fontsize=12, color='slateblue',y=0.15,x=0.3)
+
+plt.savefig('plot07a.pdf', dpi=600)
+#plt.show()
+#graph.save('plot06a.png')
+
+