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Manpages ATAN2Section: Linux Programmer's Manual (3 )Updated: 1993-06-08 Index Return to Main Contents NAMEatan2 - arc tangent function of two variablesSYNOPSIS#include <math.h> double atan2(double y, double x); DESCRIPTIONThe atan2() 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.RETURN VALUEThe atan2() function returns the result in radians, which is between -PI and PI (inclusive).CONFORMING TOSVID 3, POSIX, BSD 4.3, ISO 9899SEE ALSOacos(3), asin(3), atan(3), cos(3), sin(3), tan(3)
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