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NPROB.C
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1986-05-18
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/* 1.0 04-27-84 */
/************************************************************************
* Robert C. Tausworthe *
* Jet Propulsion Laboratory *
* Pasadena, CA 91009 1984 *
************************************************************************/
#include "defs.h"
#include "mathcons.h"
/************************************************************************/
double
nprob(x) /* Normal probability function, unit variance,
zero mean, Pr{z <= x} */
/*----------------------------------------------------------------------*/
{
double ldexp(), erfc();
return ldexp(erfc(-x / ROOTTWO), -1);
}
/************************************************************************/
double
nprobc(x) /* Normal probability complement function, unit
variance, zero mean, Pr{z >= x} */
/*----------------------------------------------------------------------*/
{
double erfc();
return ldexp(erfc(x / ROOTTWO) , -1);
}