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Lines Matching defs:erfc

44  * Performance of erfc(x):
56  * double erfc(double x)
63  *     erfc(x) =  1-erf(x)
69  *          erfc(x) = 1 - erf(x)           if x<=0.25
92  *         	erfc(x) = (1-c)  - P1(s)/Q1(s)
106  *		erfc(x)	= (1/x)exp(-x*x-(.5*log(pi) -.5z + R(z)/S(z))
112  *		erfc(x)	= (1/x)exp(-x*x-(.5*log(pi)+eps + zP(z))
119  *		erfc(x) ~ ---------- * ( 1 + Poly(1/x^2) );
126  *              erfc*x*exp(x*x) ~ 1/sqrt(pi);
139  *         	erfc(x) = tiny*tiny (raise underflow)
143  *         	erfc(0) = 1, erfc(inf) = 0, erfc(-inf) = 2,
144  *	   	erfc/erf(NaN) is NaN
211  * Coefficients for approximation to erfc in [2, 4]
229  * Coefficients for approximation to erfc in [1.25, 2]
247  * Coefficients for approximation to  erfc in [4,28]
330 erfc(double x)
334 		if (isnan(x))		/* erfc(NaN) = NaN */
336 		else if (x > 0)		/* erfc(+-inf)=0,2 */
409 	return (float)erfc(x);