integral() function
integral() computes the area under the curve per unit of time of subsequent non-null records.
integral() requires _start and _stop columns that are part of the group key.
The curve is defined using _time as the domain and record values as the range.
Function type signature
(
<-tables: stream[A],
?column: string,
?interpolate: string,
?timeColumn: string,
?unit: duration,
) => stream[B] where A: Record, B: Record
For more information, see Function type signatures.
Parameters
unit
Unit of time to use to compute the integral.
column
Column to operate on. Default is _value.
timeColumn
Column that contains time values to use in the operation.
Default is _time.
interpolate
Type of interpolation to use. Default is "".
Available interplation types:
- linear
- empty string for no interpolation
tables
Input data. Default is piped-forward data (<-).
Examples
Calculate the integral
data
|> integral(unit: 10s)
Calculate the integral with linear interpolation
data
|> integral(unit: 10s, interpolate: "linear")
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