@Override
public int calc(int input) {
int ret = 0, tmpa, tmpb;
for (int i = 0; i != upper; ++i) {
tmpa = bf.calc(i) == 0 ? 0 : 1;
tmpb = (toBitValue(input & i) == 0 ? 1 : -1);
ret += tmpa * tmpb;
}
return ret;
}
public WalshTransform(FunctionType bf) {
this.bf = bf;
n = bf.getN();
upper = 1 << n;
}