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math.cbrt() function

content/flux/v0/stdlib/math/cbrt.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#L396-L396 Contributing to Flux: https://github.com/influxdata/flux#contributing Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md ------------------------------------------------------------------------------->

math.cbrt() returns the cube root 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 cube root of a value

js
import "math"

math.cbrt(x: 1728.0)// 12.0

Use math.cbrt in map

js
import "math"
import "sampledata"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.cbrt(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
2021-01-01T00:00:00Z-1.296638256974172t1
2021-01-01T00:00:10Z2.2185755003939347t1
2021-01-01T00:00:20Z1.9442962850073848t1
2021-01-01T00:00:30Z2.5977297737212623t1
2021-01-01T00:00:40Z2.478753275547562t1
2021-01-01T00:00:50Z1.6423582966480554t1
_time_value*tag
2021-01-01T00:00:00Z2.7076145363999617t2
2021-01-01T00:00:10Z1.7065491319882757t2
2021-01-01T00:00:20Z-1.5536162529769295t2
2021-01-01T00:00:30Z2.703972205402708t2
2021-01-01T00:00:40Z2.402081527496116t2
2021-01-01T00:00:50Z1.2298089464641t2

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