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

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

Inverse https://en.wikipedia.org/wiki/Inverse_trigonometric_functions[tangent] trigonometric function.

[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]
|===

Supported types:

include::types/atan.asciidoc[]