Init

plot06a.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
+#x,y = symbols('x,y')
+#y = sqrt(64-x**2)
+
+#title="$y=\sqrt{64-x^2}$"
+#graph = plot((y),(x,-10,10),(y,-1,12),ylabel='$y$',xlabel="$y=\sqrt{64-x^2}$", show=True)
+
+plt.rc('text', usetex=True)
+plt.rc('font', family='serif')
+
+X = np.linspace(-8, 8, 512, endpoint=True)
+
+C, S = np.cos(X), np.sin(X)
+
+Y=np.sqrt(64-X**2)
+
+#plt.plot(X, C)
+
+#plt.figure(figsize=(5, 5), dpi=600)
+plt.ylim(Y.min() * 1.1, Y.max() * 1.1)
+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([-8,-6,-4,-2,0,2,4,6,8])#),rotation='vertical')
+
+plt.margins(0.2)
+
+
+plt.plot(X, Y, color="slateblue")
+
+plt.title(r"$\displaystyle y=\sqrt{64-x^2}$" ,fontsize=12, color='slateblue',y=0.15,x=0.3)
+
+#plt.show()
+#graph.save('plot06a.png')
+
+plt.savefig('plot06a.pdf', dpi=600)