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

title	description	menu	weight
math.erfcinv() function	`math.erfcinv()` returns the inverse of `math.erfc()`.	flux_v0_ref name parent identifier math.erfcinv math math/erfcinv	101

math.erfcinv() returns the inverse of math.erfc().

Function type signature

(x: float) => float

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

Parameters

x

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

x should be greater than 0 and less than 2. Otherwise the operation will return NaN.

Examples

• Return the inverse complimentary error function
• Use math.erfcinv in map

Return the inverse complimentary error function

import "math"

math.erfcinv(x: 0.42345)// 0.5660037715858239

Use math.erfcinv in map

import "math"

data
    |> map(fn: (r) => ({r with _value: math.erfcinv(x: r._value)}))

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Input data

_time	_value	*tag
2021-01-01T00:00:00Z	1.9979506490526588	t1
2021-01-01T00:00:10Z	0.000000000000000000000000000000000000000000000000000008381980138107252	t1
2021-01-01T00:00:20Z	0.000000000000000000000000262744434287864	t1
2021-01-01T00:00:30Z	0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000011164884065025777	t1
2021-01-01T00:00:40Z	0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006790933091004747	t1
2021-01-01T00:00:50Z	0.0000000003729065687554446	t1

_time	_value	*tag
2021-01-01T00:00:00Z	0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002144458719979885	t2
2021-01-01T00:00:10Z	0.0000000000020855419929990413	t2
2021-01-01T00:00:20Z	1.9999998862727435	t2
2021-01-01T00:00:30Z	0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005123973574678553	t2
2021-01-01T00:00:40Z	0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000015161509817813512	t2
2021-01-01T00:00:50Z	0.008527511664360422	t2

Output data

_time	_value	*tag
2021-01-01T00:00:00Z	-2.1800000000000006	t1
2021-01-01T00:00:10Z	+Inf	t1
2021-01-01T00:00:20Z	+Inf	t1
2021-01-01T00:00:30Z	+Inf	t1
2021-01-01T00:00:40Z	+Inf	t1
2021-01-01T00:00:50Z	4.429999992395194	t1

_time	_value	*tag
2021-01-01T00:00:00Z	+Inf	t2
2021-01-01T00:00:10Z	4.969999434158999	t2
2021-01-01T00:00:20Z	-3.7500000000779927	t2
2021-01-01T00:00:30Z	+Inf	t2
2021-01-01T00:00:40Z	+Inf	t2
2021-01-01T00:00:50Z	1.860000000000001	t2

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