elasticsearch/docs/reference/esql/functions/atan.asciidoc

[discrete]
[[esql-atan]]
=== `ATAN`

*Syntax*

[.text-center]
image::esql/functions/signature/atan.svg[Embedded,opts=inline]

*Parameters*

`n`::
Numeric expression. If `null`, the function returns `null`.

*Description*

Returns the {wikipedia}/Inverse_trigonometric_functions[arctangent] of the input
numeric expression as an angle, expressed in radians.

*Supported types*

include::types/atan.asciidoc[]

*Example*

[source.merge.styled,esql]
----
include::{esql-specs}/floats.csv-spec[tag=atan]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/floats.csv-spec[tag=atan-result]
|===