aver.c File Reference

Inverse versed sine function. More...

#include "prim.h"

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Functions
double	aver (double x)
	Inverse versed sine function. More...

Detailed Description

Inverse versed sine function.

Definition in file aver.c.

Function Documentation

aver()

double aver

(

double

x

)

Inverse versed sine function.

Definition at line 40 of file aver.c.

References atan(), and sqrt().

Referenced by RealNumber::ArcVerSine().

{
    double a, b, c, d;

    if (x < 0.0 || x > 2.0)
    {
        return NAN;
    }

    a = 2.0 * x - x * x;
    b = sqrt(a);
    c = 1.0 - x;

    if (TRIG_INEXACT(c))
    {
        return INFP;
    }

    d = atan(b / c);
    return d;
}

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