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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [mathfp/] [s_atan2.c] - Rev 232
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/* @(#)z_atan2.c 1.0 98/08/13 */ /* FUNCTION <<atan2>>, <<atan2f>>---arc tangent of y/x INDEX atan2 INDEX atan2f ANSI_SYNOPSIS #include <math.h> double atan2(double <[y]>,double <[x]>); float atan2f(float <[y]>,float <[x]>); TRAD_SYNOPSIS #include <math.h> double atan2(<[y]>,<[x]>); double <[y]>; double <[x]>; float atan2f(<[y]>,<[x]>); float <[y]>; float <[x]>; DESCRIPTION <<atan2>> computes the inverse tangent (arc tangent) of <[y]>/<[x]>. <<atan2>> produces the correct result even for angles near @ifnottex pi/2 or -pi/2 @end ifnottex @tex $\pi/2$ or $-\pi/2$ @end tex (that is, when <[x]> is near 0). <<atan2f>> is identical to <<atan2>>, save that it takes and returns <<float>>. RETURNS <<atan2>> and <<atan2f>> return a value in radians, in the range of @ifnottex -pi to pi. @end ifnottex @tex $-\pi$ to $\pi$. @end tex If both <[x]> and <[y]> are 0.0, <<atan2>> causes a <<DOMAIN>> error. You can modify error handling for these functions using <<matherr>>. PORTABILITY <<atan2>> is ANSI C. <<atan2f>> is an extension. */ /****************************************************************** * Arctangent2 * * Input: * v, u - floating point values * * Output: * arctan2 of v / u * * Description: * This routine returns the arctan2 of v / u. * *****************************************************************/ #include "fdlibm.h" #include "zmath.h" #ifndef _DOUBLE_IS_32BITS double _DEFUN (atan2, (double, double), double v _AND double u) { return (atangent (0.0, v, u, 1)); } #endif /* _DOUBLE_IS_32BITS */
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