/**
* Determines whether a restart with a smaller simplex should be tried or not
*
* @return <CODE>true</CODE> if restart can be tried, <CODE>false</CODE> otherwise
*/
protected boolean restartCriterion() {
double f, S1, S2;
double[] fX = new double[dimXP1];
for (int i = 0; i < dimXP1; i++) fX[i] = x[i].getF(0);
S1 = LinAlg.twoNorm(fX);
S1 *= S1;
S2 = LinAlg.oneNorm(fX);
S2 *= S2;
S2 /= (double) (dimXP1);
f = (S1 - S2) / (double) dimX;
if (f < (sqEps)) return true;
else return false;
}
