larray.LArray.cumprod¶

LArray.cumprod(self, axis=-1)[source]¶

Returns the cumulative product of array elements.

Parameters

axisint or str or Axis, optional: Axis along which to perform the cumulative product. If given as position, it can be a negative integer, in which case it counts from the last to the first axis. By default, the cumulative product is performed along the last axis.

Returns

LArray or scalar

See also

LArray.cumsum, LArray.sum, LArray.sum_by
LArray.prod, LArray.prod_by

Notes

Cumulative aggregation functions accept only one axis.

Examples

>>> arr = ndtest((4, 4))
>>> arr
a\b  b0  b1  b2  b3
 a0   0   1   2   3
 a1   4   5   6   7
 a2   8   9  10  11
 a3  12  13  14  15
>>> arr.cumprod()
a\b  b0   b1    b2     b3
 a0   0    0     0      0
 a1   4   20   120    840
 a2   8   72   720   7920
 a3  12  156  2184  32760
>>> arr.cumprod('a')
a\b  b0   b1    b2    b3
 a0   0    1     2     3
 a1   0    5    12    21
 a2   0   45   120   231
 a3   0  585  1680  3465