@Override
public Vec clone() {
SparseVector copy = new SparseVector(length, Math.max(used, 10));
System.arraycopy(this.values, 0, copy.values, 0, this.used);
System.arraycopy(this.indexes, 0, copy.indexes, 0, this.used);
copy.used = this.used;
return copy;
}
@Override
public Vec sortedCopy() {
IndexTable it = new IndexTable(DoubleList.unmodifiableView(values, used));
double[] newValues = new double[used];
int[] newIndecies = new int[used];
int lessThanZero = 0;
for (int i = 0; i < used; i++) {
int origIndex = it.index(i);
newValues[i] = values[origIndex];
if (newValues[i] < 0) lessThanZero++;
newIndecies[i] = i;
}
// all < 0 values are right, now correct > 0 values
for (int i = lessThanZero; i < used; i++)
newIndecies[i] = length - (used - lessThanZero) + (i - lessThanZero);
SparseVector sv = new SparseVector(length);
sv.used = this.used;
sv.values = newValues;
sv.indexes = newIndecies;
return sv;
}