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atan2

(PHP 4, PHP 5, PHP 7)

Arc tangent of two variables

float atan2 ( float $y, float $x )

This function calculates the arc tangent of the two variables x and y. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

The function returns the result in radians, which is between -PI and PI (inclusive).

Parameters:

y

Dividend parameter

x

Divisor parameter

Returns:

The arc tangent of y/x in radians.

See also:

Links:

http://php.net/manual/en/function.atan2.php

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2016-02-24 16:02:26

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