Sum

Running sum.

Attributes

• sum (float)

  The running sum.

Examples

>>> from river import stats

>>> X = [-5, -3, -1, 1, 3, 5]
>>> mean = stats.Sum()
>>> for x in X:
...     print(mean.update(x).get())
-5.0
-8.0
-9.0
-8.0
-5.0
0.0

>>> from river import utils

>>> X = [1, -4, 3, -2, 2, 1]
>>> rolling_sum = utils.Rolling(stats.Sum(), window_size=2)
>>> for x in X:
...     print(rolling_sum.update(x).get())
1.0
-3.0
-1.0
1.0
0.0
3.0

Methods

get

Return the current value of the statistic.

revert

update

Update and return the called instance.

Parameters

• x (numbers.Number)