atan2
(PHP 4, PHP 5)
atan2 — Arc tangent of two variables
Description
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
Return Values
The arc tangent of y
/x
in radians.
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