elasticsearch/docs/reference/query-languages/esql/_snippets/functions/atan.md

ATAN [esql-atan]

Syntax

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Parameters

number

Numeric expression. If null, the function returns null.

Description

Returns the arctangent of the input numeric expression as an angle, expressed in radians.

Supported types

number	result
double	double
integer	double
long	double
unsigned_long	double

Example

ROW a=12.9
| EVAL atan=ATAN(a)

a:double	atan:double
12.9	1.4934316673669235