python - cumsum和cumprod在 numpy中是干嘛用的

Question

• cumsum

d = arange(0, 10)

# cummulative sum
cumsum(d)

结果是

=> array([ 0,  1,  3,  6, 10, 15, 21, 28, 36, 45])

• cumprod

# cummulative product
cumprod(d+1)

结果是

=> array([      1,       2,       6,      24,     120,     720,    5040,
            40320,  362880, 3628800])

想问一下，这两个函数是干嘛用的，百度了好久也没找到解答。谢谢

Answer 1

Accumulation and cumulative multiplication
There are many uses for accumulation, such as looking at data change trends, etc.