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math.exp() function

content/flux/v0/stdlib/math/exp.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#L755-L755 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

math.exp() returns e**x, the base-e 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-e exponential of a value

js
import "math"

math.exp(x: 21.0)// 1.3188157344832146e+09

Use math.exp in map

js
import "sampledata"
import "math"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.exp(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
2021-01-01T00:00:00Z0.11304153064044985t1
2021-01-01T00:00:10Z55270.798943169066t1
2021-01-01T00:00:20Z1556.1965278371533t1
2021-01-01T00:00:30Z41037629.64620374t1
2021-01-01T00:00:40Z4114385.297453036t1
2021-01-01T00:00:50Z83.93141691026881t1
_time_value*tag
2021-01-01T00:00:00Z417585553.5730289t2
2021-01-01T00:00:10Z144.02688737091955t2
2021-01-01T00:00:20Z0.023517745856009107t2
2021-01-01T00:00:30Z385480050.5181745t2
2021-01-01T00:00:40Z1045493.9383645338t2
2021-01-01T00:00:50Z6.423736771429135t2

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