35 lines
544 B
Markdown
35 lines
544 B
Markdown
---
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title: math.j1() function
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description: The math.j1() function returns the order-one Bessel function of the first kind.
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menu:
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v2_0_ref:
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name: math.j1
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parent: Math
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weight: 301
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---
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The `math.j1()` function returns the order-one Bessel function of the first kind.
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_**Output data type:** Float_
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```js
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import "math"
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math.j1(x: 1.23)
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// Returns 0.5058005726280961
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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.j1(±Inf) // Returns 0
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math.j1(NaN) // Returns NaN
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```
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