/*------------------------------------------------------------------*/
double getInitialCausalCoefficientMirrorOnBounds(double[] c, double z, double tolerance) {
double z1 = z, zn = Math.pow(z, c.length - 1);
double sum = c[0] + zn * c[c.length - 1];
int horizon = c.length;
if (0.0 < tolerance) {
horizon = 2 + (int) (Math.log(tolerance) / Math.log(Math.abs(z)));
horizon = (horizon < c.length) ? (horizon) : (c.length);
}
zn = zn * zn;
for (int n = 1; (n < (horizon - 1)); n++) {
zn = zn / z;
sum = sum + (z1 + zn) * c[n];
z1 = z1 * z;
}
return (sum / (1.0 - Math.pow(z, 2 * c.length - 2)));
} /* end getInitialCausalCoefficientMirrorOnBounds */
