Numpy元素個數統計、根據條件修改元素值

data數組中小於1的元素都替換爲0

data [data < 1.0] = 0

統計元素個數： 

import numpy as np
from collections import Counter
a = np.array([[1,2],[3,4]])
Counter(a.flatten()) # 二維數組需展平統計

Out: Counter({1: 1, 2: 1, 3: 1, 4: 1})