dacos.c

speech signal process tools

/*
acos(arg)

0<= acos <=pi
Arctan is called after appropriate range reduction.
*/

#include	<errno.h>
int errno;
double atan();
double asin();
static double pio2	= 1.570796326794896619;

double
dacos(arg) double arg; {

	if(arg > 1.|| arg < -1.){
		errno = EDOM;
		return(0.);
	}

	return(pio2 - asin(arg));
}