43 lines
843 B
Markdown
43 lines
843 B
Markdown
---
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title: math.expm1() function
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description: >
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The math.expm1() function returns `e**x - 1`, the base-e exponential of `x` minus 1.
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It is more accurate than `math.exp(x:x) - 1` when `x` is near zero.
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aliases:
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- /v2.0/reference/flux/functions/math/expm1/
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menu:
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v2_0_ref:
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name: math.expm1
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parent: Math
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weight: 301
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---
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The `math.expm1()` function returns `e**x - 1`, the base-e exponential of `x` minus 1.
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It is more accurate than `math.exp(x:x) - 1` when `x` is near zero.
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_**Output data type:** Float_
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```js
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import "math"
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math.expm1(x: 1.22)
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// Returns 2.3871877336213343
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```
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## Parameters
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### x
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The value used in the operation.
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_**Data type:** Float_
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## Special cases
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```js
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math.expm1(+Inf) // Returns +Inf
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math.expm1(-Inf) // Returns -1
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math.expm1(NaN) // Returns NaN
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```
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Very large values overflow to -1 or +Inf.
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