PostgreSQL atand() Function

The PostgreSQL atand() function returns the arctangent of a specified number in degrees.

atand() Syntax

This is the syntax of the PostgreSQL atand() function:

atand(number)

atand(number) Equivalent to degrees(atan(number)).

Parameters

number

Required. The number used to calculate the arctangent.

Return value

The PostgreSQL atand() function returns the arctangent of a specified number in degrees.

If the parameter number is NULL, the atand() function will return NULL.

atand() Examples

Here are a few examples of the atand() function:

SELECT
    atand(-1) AS "atand(-1)",
    atand(-0.5) AS "atand(-0.5)",
    atand(-0.2) AS "atand(-0.2)",
    atand(0) AS "atand(0)",
    atand(0.2) AS "atand(0.2)",
    atand(0.5) AS "atand(0.5)",
    atand(1) AS "atand(1)";

-[ RECORD 1 ]--------------------
atand(-1)   | -45
atand(-0.5) | -26.565051177077986
atand(-0.2) | -11.309932474020215
atand(0)    | 0
atand(0.2)  | 11.309932474020215
atand(0.5)  | 26.565051177077986
atand(1)    | 45

atand(number) is equivalent to perform atan(number) first, and then converting the result to degrees using degrees() function, for example:

SELECT
    atand(1) AS "atand(1)",
    degrees(atan(1)) AS "degrees(atan(1))";

-[ RECORD 1 ]----+---
atand(1)         | 45
degrees(atan(1)) | 45