40 lines
652 B
Markdown
40 lines
652 B
Markdown
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## `ATAN` [esql-atan]
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**Syntax**
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:::{image} ../../../../../images/atan.svg
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:alt: Embedded
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:class: text-center
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:::
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**Parameters**
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`number`
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: Numeric expression. If `null`, the function returns `null`.
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**Description**
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Returns the [arctangent](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) of the input numeric expression as an angle, expressed in radians.
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**Supported types**
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| number | result |
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| --- | --- |
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| double | double |
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| integer | double |
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| long | double |
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| unsigned_long | double |
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**Example**
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```esql
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ROW a=12.9
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| EVAL atan=ATAN(a)
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```
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| a:double | atan:double |
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| --- | --- |
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| 12.9 | 1.4934316673669235 |
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