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