求向量累加和向量：cumsum(X)求向量累乘积向量：cumprod(X)求矩阵每一列的累加和：cumsum(A)、cumsum(A,1)求矩阵每一列的累积积：cumprod(A)、cumprod(A,1)求矩阵每一行的累加和：cumsum(A,2)求矩阵每一行的累积积：cumprod(A,2)
