docs-v2/content/flux/v0/stdlib/math/exp2.md

title	description	menu	weight
math.exp2() function	`math.exp2()` returns `2**x`, the base-2 exponential of `x`.	flux_v0_ref name parent identifier math.exp2 math math/exp2	101

math.exp2() returns 2**x, the base-2 exponential 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 base-2 exponential of a value
• Use math.exp2 in map

Return the base-2 exponential of a value

import "math"

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

Use math.exp2 in map

import "sampledata"
import "math"

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

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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	0.22067574907266369	t1
2021-01-01T00:00:10Z	1937.5260604940204	t1
2021-01-01T00:00:20Z	163.1437602968655	t1
2021-01-01T00:00:30Z	189258.68751552477	t1
2021-01-01T00:00:40Z	38431.45561643022	t1
2021-01-01T00:00:50Z	21.55573722985104	t1

_time	_value	*tag
2021-01-01T00:00:00Z	945029.6050826148	t2
2021-01-01T00:00:10Z	31.341449522781655	t2
2021-01-01T00:00:20Z	0.07432544468767006	t2
2021-01-01T00:00:30Z	894052.4842704767	t2
2021-01-01T00:00:40Z	14868.793840716358	t2
2021-01-01T00:00:50Z	3.6300766212686435	t2

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