cumprod
Syntax
cumprod(X)
Please see Cumulative Window Functions for the parameter description and windowing logic.
Details
Cumulatively calculate the product of the elements in X.
Note:
Similar to NumPy's numpy.cumprod, but DolphinDB's
cumprod computes cumulative products along columns by default
for matrices (equivalent to numpy.cumsum with axis=0), and only accepts one
parameter X without support for the axis, dtype, or out
parameters available in numpy.cumprod.Returns
An object with the same data type and form as X.
Examples
cumprod(2 3 4);
// output: [2,6,24] // equivalent to [2, 2*3, 2*3*4]
m=matrix(1 2 3, 4 5 6);
m;| #0 | #1 |
|---|---|
| 1 | 4 |
| 2 | 5 |
| 3 | 6 |
cumprod(m);| #0 | #1 |
|---|---|
| 1 | 4 |
| 2 | 20 |
| 6 | 120 |
Related functions: prod