CumProd

返回矩阵/向量元素的累积乘积，包括沿给定轴的累积乘积。

vector vector::CumProd();



vector matrix::CumProd();



matrix matrix::CumProd(

  const int  axis      // axis

   );

参数

axis

[输入] 轴。 0 — 每列的水平轴（即，整行），1 — 每行的垂直轴（即，整列）

返回值

元素沿给定轴的累积乘积。

举例

   matrix matrix_a={{10,3,2},{1,8,12},{6,5,4},{7,11,9}};

   Print("matrix_a\n",matrix_a);



   matrix cols_cumprod=matrix_a.CumProd(0);

   matrix rows_cumprod=matrix_a.CumProd(1);

   vector cumprod_values=matrix_a.CumProd();



   Print("cols_cumprod\n",cols_cumprod);

   Print("rows_cumprod\n",rows_cumprod);

   Print("cumprod values  ",cumprod_values);



   /*

   matrix_a

   [[10,3,2]

    [1,8,12]

    [6,5,4]

    [7,11,9]]

   cols_cumprod

   [[10,3,2]

    [10,24,24]

    [60,120,96]

    [420,1320,864]]

   rows_cumprod

   [[10,30,60]

    [1,8,96]

    [6,30,120]

    [7,77,693]]

   cumprod values  [10,30,60,60,480,5760,34560,172800,691200,4838400,53222400,479001600]

   */