@Test
public void testAxpyArrayArray() {

    Vector y = new DenseVector(new double[] {1.0, 2.0});
    double a = 2.0;
    Vector x = new DenseVector(new double[] {1.0, 2.0});
    Vector exp = x.times(a).plus(y);
    Blas.axpy(a, x, y);
    Assert.assertEquals(y, exp);
}