Draw exp and log graph

rhaos68 · Oct 14, 2020 · aafb4d6 · aafb4d6
1 parent 21516b6
commit aafb4d6
Showing 1 changed file with 48 additions and 0 deletions.
diff --git a/exp_log_graph.py b/exp_log_graph.py
@@ -0,0 +1,48 @@
+import numpy as np
+import matplotlib.pyplot as plt
+
+def draw_exp():
+    x = np.arange(-0.2, 3, 0.01)
+
+    y2 = 2 ** x
+    y3 = 3 ** x
+
+    plt.plot(x,y2, color='blue')
+    plt.text(2.6, 2**2.6+1,r"$y=2^x$")
+
+    plt.plot(x,y3, color='blue')
+    plt.text(2.72, 3**2.7+1,r"$y=3^x$")
+
+    ye = np.e ** x
+    plt.plot(x,ye, color='green')
+    plt.text(2.65, np.e**2.6,r"$y=e^x$", color='green')
+
+    plt.axhline(y=0, color='black', label='x')
+    plt.axvline(x=0, color='black', label='y')
+
+    plt.show()
+
+def draw_log():
+    x = np.arange(0.1, 30, 0.01)
+
+    ye = np.log(x)
+    y2 = np.log2(x)
+    y3 = np.log(x) / np.log(3)
+
+    plt.plot(x,y2, color='blue')
+    plt.text(15, 4.2,r"$y=\ln 2$")
+
+    plt.plot(x,y3, color='blue')
+    plt.text(25, 2.6,r"$y=\ln 3$")
+
+    plt.plot(x,ye, color='green')
+    plt.text(20, 3.2,r"$y=\ln x$", color='green')
+
+    plt.axhline(y=0, color='black', label='x')
+    plt.axvline(x=0, color='black', label='y')
+
+    plt.show()
+
+
+# draw_exp()
+draw_log()