/**
* Compute and return the L1 norm (sum) of the vector.
*
* @return the sum of the vector's values
*/
public double sum() {
double result = 0;
DoubleIterator iter = values().iterator();
while (iter.hasNext()) {
result += iter.nextDouble();
}
return result;
}
/**
* Compute and return the L2 norm (Euclidian length) of the vector.
*
* @return The L2 norm of the vector
*/
public double norm() {
double ssq = 0;
DoubleIterator iter = values().iterator();
while (iter.hasNext()) {
double v = iter.nextDouble();
ssq += v * v;
}
return Math.sqrt(ssq);
}