np.max 与 np.maximum
2016-09-29 12:24
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1. 参数
首先比较二者的参数部分:np.max:(a, axis=None, out=None, keepdims=False)
求序列的最值
最少接收一个参数
axis:默认为列向(也即 axis=0),axis = 1 时为行方向的最值;
np.maximum:(X, Y, out=None)
X 与 Y 逐位比较取其大者;
最少接收两个参数
2. 使用上
>> np.max([-2, -1, 0, 1, 2]) 2 >> np.maximum([-2, -1, 0, 1, 2], 0) array([0, 0, 0, 1, 2]) # 当然 np.maximum 接受的两个参数,也可以大小一致 # 或者更为准确地说,第二个参数只是一个单独的值时,其实是用到了维度的 broadcast 机制;
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