docs-v2/content/flux/v0/stdlib/math/erf.md

title	description	menu	weight
math.erf() function	`math.erf()` returns the error function of `x`.	flux_v0_ref name parent identifier math.erf math math/erf	101

math.erf() returns the error function of x.

Function type signature

(x: float) => float

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

Parameters

x

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

Examples

• Return the error function of a value.
• Use math.erf in map

Return the error function of a value.

import "math"

math.erf(x: 22.6)// 1.0

Use math.erf in map

import "math"
import "sampledata"

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

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

Input data

_time	*tag	_value
2021-01-01T00:00:00Z	t1	-2.18
2021-01-01T00:00:10Z	t1	10.92
2021-01-01T00:00:20Z	t1	7.35
2021-01-01T00:00:30Z	t1	17.53
2021-01-01T00:00:40Z	t1	15.23
2021-01-01T00:00:50Z	t1	4.43

_time	*tag	_value
2021-01-01T00:00:00Z	t2	19.85
2021-01-01T00:00:10Z	t2	4.97
2021-01-01T00:00:20Z	t2	-3.75
2021-01-01T00:00:30Z	t2	19.77
2021-01-01T00:00:40Z	t2	13.86
2021-01-01T00:00:50Z	t2	1.86

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	-0.9979506490526588	t1
2021-01-01T00:00:10Z	1	t1
2021-01-01T00:00:20Z	1	t1
2021-01-01T00:00:30Z	1	t1
2021-01-01T00:00:40Z	1	t1
2021-01-01T00:00:50Z	0.9999999996270934	t1

_time	_value	*tag
2021-01-01T00:00:00Z	1	t2
2021-01-01T00:00:10Z	0.9999999999979144	t2
2021-01-01T00:00:20Z	-0.9999998862727434	t2
2021-01-01T00:00:30Z	1	t2
2021-01-01T00:00:40Z	1	t2
2021-01-01T00:00:50Z	0.9914724883356396	t2

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