@Test
public void testSum() {
double[] vals = {1, 2, 3, 4, 5, 6, 7, 8};
DoubleVector vec = new DenseDoubleVector(vals);
double expected = 0;
double res = vec.sum();
for (int i = 0; i < vals.length; ++i) {
expected += vec.get(i);
}
assertEquals(expected, res, 0.000001);
}
