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math.exp2() function

content/flux/v0/stdlib/math/exp2.md

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<!------------------------------------------------------------------------------ IMPORTANT: This page was generated from comments in the Flux source code. Any edits made directly to this page will be overwritten the next time the documentation is generated. To make updates to this documentation, update the function comments above the function definition in the Flux source code: https://github.com/influxdata/flux/blob/master/stdlib/math/math.flux#L789-L789 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

math.exp2() returns 2**x, the base-2 exponential of x.

Function type signature
js
(x: float) => float

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

Parameters

x

({{< req >}}) Value to operate on.

Examples

Return the base-2 exponential of a value

js
import "math"

math.exp2(x: 21.0)// 2.097152e+06

Use math.exp2 in map

js
import "sampledata"
import "math"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.exp2(x: r._value)}))

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

Input data

_time*tag_value
2021-01-01T00:00:00Zt1-2.18
2021-01-01T00:00:10Zt110.92
2021-01-01T00:00:20Zt17.35
2021-01-01T00:00:30Zt117.53
2021-01-01T00:00:40Zt115.23
2021-01-01T00:00:50Zt14.43
_time*tag_value
2021-01-01T00:00:00Zt219.85
2021-01-01T00:00:10Zt24.97
2021-01-01T00:00:20Zt2-3.75
2021-01-01T00:00:30Zt219.77
2021-01-01T00:00:40Zt213.86
2021-01-01T00:00:50Zt21.86

Output data

_time_value*tag
2021-01-01T00:00:00Z0.22067574907266369t1
2021-01-01T00:00:10Z1937.5260604940204t1
2021-01-01T00:00:20Z163.1437602968655t1
2021-01-01T00:00:30Z189258.68751552477t1
2021-01-01T00:00:40Z38431.45561643022t1
2021-01-01T00:00:50Z21.55573722985104t1
_time_value*tag
2021-01-01T00:00:00Z945029.6050826148t2
2021-01-01T00:00:10Z31.341449522781655t2
2021-01-01T00:00:20Z0.07432544468767006t2
2021-01-01T00:00:30Z894052.4842704767t2
2021-01-01T00:00:40Z14868.793840716358t2
2021-01-01T00:00:50Z3.6300766212686435t2

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