public void Subtract()
{
DoubleVector a = new DoubleVector(new double[4]{0,1,2,3});
DoubleVector b = new DoubleVector(new double[4]{4,5,6,7});
DoubleVector c = new DoubleVector(a.Length);
DoubleVector d = new DoubleVector(b.Length);
c = a-b;
d = DoubleVector.Subtract(a,b);
Assert.AreEqual(c[0],a[0]-b[0]);
Assert.AreEqual(c[1],a[1]-b[1]);
Assert.AreEqual(c[2],a[2]-b[2]);
Assert.AreEqual(c[3],a[3]-b[3]);
Assert.AreEqual(d[0],c[0]);
Assert.AreEqual(d[1],c[1]);
Assert.AreEqual(d[2],c[2]);
Assert.AreEqual(d[3],c[3]);
a.Subtract(b);
Assert.AreEqual(c[0],a[0]);
Assert.AreEqual(c[1],a[1]);
Assert.AreEqual(c[2],a[2]);
Assert.AreEqual(c[3],a[3]);
}
