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10个编程技巧/lambda.py

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+p = lambda x,y:x+y
+print(p(4,6))

实例学习Numpy与Matplotlib/np.dot(),np.outer(),np.multiply().py

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+# https://www.cnblogs.com/ssyfj/p/12913015.html
+
+# https://www.jianshu.com/p/42b0b6ffcf97
+
+import numpy as np
+# 1-D array
+a = np.array([1, 2, 3])
+b = np.array([4, 5, 6])
+print('result1 = a*b', a*b)
+print('result2 = a@b' ,a@b)
+# result1 = a@b [ 4 10 18]
+# result2 = b@a 32
+
+a = np.array([[1, 2, 3], [4, 5, 6]])
+b = np.array([[1, 2], [3, 4], [5, 6]])
+print("result3 = a@b",a@b)
+# result3 = a@b [[22 28]
+#   [49 64]]
+
+a = np.array([1, 2, 3, 4, 5, 6])
+b = np.array([1, 2, 3,4])
+
+outer_result_1 =  np.outer(a,b)
+print('outer_result_1:\n %s' %(outer_result_1))
+# outer_result_1:
+#  [[ 1  2  3  4]
+#  [ 2  4  6  8]
+#  [ 3  6  9 12]
+#  [ 4  8 12 16]
+#  [ 5 10 15 20]
+#  [ 6 12 18 24]]
+
+a = np.array([[1, 2, 3], [4, 5, 6]])
+b = np.array([[1, 2], [3,4]])
+
+outer_result_2 =  np.outer(a,b)
+print('outer_result_2:\n %s' %(outer_result_2))
+# outer_result_2:
+#  [[ 1  2  3  4]
+#  [ 2  4  6  8]
+#  [ 3  6  9 12]
+#  [ 4  8 12 16]
+#  [ 5 10 15 20]
+#  [ 6 12 18 24]]
+
+