static int get_argc(char *buf, char *argv[], int max)
{
char * sp;
int ix;
sp = buf;
ix = 0;
while (*sp && (ix < max)) {
sp = get_del(sp, argv, ix);
ix++;
}
return ix;
}
/*
* Normal cdf for 0.66291 < fabs(x) < sqrt(32).
*/
static double
gauss_medium (const double x)
{
unsigned int i;
double temp = 0.0;
double result = 0.0;
double xnum;
double xden;
double absx;
const double c[9] = {
0.39894151208813466764,
8.8831497943883759412,
93.506656132177855979,
597.27027639480026226,
2494.5375852903726711,
6848.1904505362823326,
11602.651437647350124,
9842.7148383839780218,
1.0765576773720192317e-8
};
const double d[8] = {
22.266688044328115691,
235.38790178262499861,
1519.377599407554805,
6485.558298266760755,
18615.571640885098091,
34900.952721145977266,
38912.003286093271411,
19685.429676859990727
};
absx = fabs (x);
xnum = c[8] * absx;
xden = absx;
for (i = 0; i < 7; i++)
{
xnum = (xnum + c[i]) * absx;
xden = (xden + d[i]) * absx;
}
temp = (xnum + c[7]) / (xden + d[7]);
result = get_del (x, temp);
return result;
}
/*
* Normal cdf for
* {sqrt(32) < x < GAUSS_XUPPER} union { GAUSS_XLOWER < x < -sqrt(32) }.
*/
static double
gauss_large (const double x)
{
int i;
double result;
double xsq;
double temp;
double xnum;
double xden;
double absx;
const double p[6] = {
0.21589853405795699,
0.1274011611602473639,
0.022235277870649807,
0.001421619193227893466,
2.9112874951168792e-5,
0.02307344176494017303
};
const double q[5] = {
1.28426009614491121,
0.468238212480865118,
0.0659881378689285515,
0.00378239633202758244,
7.29751555083966205e-5
};
absx = fabs (x);
xsq = 1.0 / (x * x);
xnum = p[5] * xsq;
xden = xsq;
for (i = 0; i < 4; i++)
{
xnum = (xnum + p[i]) * xsq;
xden = (xden + q[i]) * xsq;
}
temp = xsq * (xnum + p[4]) / (xden + q[4]);
temp = (M_1_SQRT2PI - temp) / absx;
result = get_del (x, temp);
return result;
}
