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python Numpy中的min(),max(),sum(),shape函数
import numpy as np aaa = np.array([[10,9,8],[7,6,5],[42,33,2],[56,65,10]]) print(aaa) # [[10 9 8] # [ 7 6 5] # [42 33 2] ……)
Miigua
2022-02-16 10:57
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python数组下标为负数_python数组冒号取值操作
1.冒号的用法 1.1 一个冒号 a[i:j] 这里的i指起始位置，默认为0；j是终止位置，默认为len(a)，在取出数组中的值时就会从数组下标i(包括)一直取到下标j(不包括j) 在一个冒号的情况下若出现负数则代表倒数某个位置 a[i:-j] 这里就是从下标……)
Miigua
2022-02-16 10:49
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