docs-v2/content/flux/v0/stdlib/universe/cumulativesum.md

title	description	menu	weight	flux/v0/tags	introduced
cumulativeSum() function	`cumulativeSum()` computes a running sum for non-null records in a table.	flux_v0_ref name parent identifier cumulativeSum universe universe/cumulativeSum	101	transformations	0.7.0

cumulativeSum() computes a running sum for non-null records in a table.

The output table schema will be the same as the input table.

Function type signature

(<-tables: stream[A], ?columns: [string]) => stream[B] where A: Record, B: Record

{{% caption %}} For more information, see Function type signatures. {{% /caption %}}

Parameters

columns

List of columns to operate on. Default is ["_value"].

tables

Input data. Default is piped-forward data (<-).

Examples

Return the running total of values in each table

import "sampledata"

sampledata.int()
    |> cumulativeSum()

{{< expand-wrapper >}} {{% expand "View example input and output" %}}

Input data

_time	_value	*tag
2021-01-01T00:00:00Z	-2	t1
2021-01-01T00:00:10Z	10	t1
2021-01-01T00:00:20Z	7	t1
2021-01-01T00:00:30Z	17	t1
2021-01-01T00:00:40Z	15	t1
2021-01-01T00:00:50Z	4	t1

_time	_value	*tag
2021-01-01T00:00:00Z	19	t2
2021-01-01T00:00:10Z	4	t2
2021-01-01T00:00:20Z	-3	t2
2021-01-01T00:00:30Z	19	t2
2021-01-01T00:00:40Z	13	t2
2021-01-01T00:00:50Z	1	t2

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	-2	t1
2021-01-01T00:00:10Z	8	t1
2021-01-01T00:00:20Z	15	t1
2021-01-01T00:00:30Z	32	t1
2021-01-01T00:00:40Z	47	t1
2021-01-01T00:00:50Z	51	t1

_time	_value	*tag
2021-01-01T00:00:00Z	19	t2
2021-01-01T00:00:10Z	23	t2
2021-01-01T00:00:20Z	20	t2
2021-01-01T00:00:30Z	39	t2
2021-01-01T00:00:40Z	52	t2
2021-01-01T00:00:50Z	53	t2

{{% /expand %}} {{< /expand-wrapper >}}