예제
import numpy as np
arr = np.random.randint(-5, 5, 100)
# 누적 합계 결과 구해서 리스트로 표현하기
# 1, 2, 3, 4, 5 <- comsum() 1+2 = 3, 6, 10, 15
arr2 = arr.cumsum()
arr, arr2
'''
(array([-3, -1, -5, 1, 4, 2, 1, 3, 3, 1, 0, -3, 1, -1, 3, 0, -3,
3, 1, 2, -3, -2, -1, 4, -4, -4, 0, -1, -5, -3, 3, -4, 2, 4,
0, 4, -1, 4, 3, -3, 2, 1, 3, -3, -4, 4, -4, 3, -5, 1, 4,
1, -1, -3, -4, 4, 4, 3, 0, -3, 4, 4, 3, 4, -2, -5, -5, 3,
-2, 1, 1, 4, -4, 4, -2, -1, -1, 0, -1, -3, -1, -1, -4, 0, 3,
-3, -3, 2, 0, -3, -1, 0, -3, -2, 2, -5, 3, 3, 0, 2]),
array([ -3, -4, -9, -8, -4, -2, -1, 2, 5, 6, 6, 3, 4,
3, 6, 6, 3, 6, 7, 9, 6, 4, 3, 7, 3, -1,
-1, -2, -7, -10, -7, -11, -9, -5, -5, -1, -2, 2, 5,
2, 4, 5, 8, 5, 1, 5, 1, 4, -1, 0, 4, 5,
4, 1, -3, 1, 5, 8, 8, 5, 9, 13, 16, 20, 18,
13, 8, 11, 9, 10, 11, 15, 11, 15, 13, 12, 11, 11,
10, 7, 6, 5, 1, 1, 4, 1, -2, 0, 0, -3, -4,
-4, -7, -9, -7, -12, -9, -6, -6, -4], dtype=int32))
'''
import matplotlib.pyplot as plt
plt.plot(arr2)
plt.show()