add day18 homework

Author: alvinhuu

D18_matplotlib/homework.py

@@ -0,0 +1,26 @@
+import pandas as pd  
+import matplotlib.pyplot as plt
+import numpy as np
+
+# 1.   畫出 cos 圖檔，並儲存
+x = np.arange(0,360)
+y = np.cos(x*np.pi/180.0)
+plt.plot(x,y, color = 'red')
+
+ # 照需要寫入x 軸和y軸的 label 以及title	
+plt.xlabel("x-axis") 
+plt.ylabel("y-axis") 
+plt.title("Cos graphic") 
+plt.savefig("cos.png",dpi=300,format="png")
+plt.show()
+
+# 2.    給定散點圖顏色
+X = np.random.normal(0, 1, 100)
+Y = np.random.normal(0, 1, 100)
+plt.scatter(X, Y, color = 'gold')
+plt.title("Scatter plot")
+
+# 如果要存成圖形檔:
+# 把 pyplot.show() 換成下面這行:
+plt.savefig("Scatter.png",dpi=300,format="png")
+plt.show()