Ejemplo n.º 1
1
 public Object cross(Vector lhs, Vector rhs) throws ParseException {
   int len = lhs.size();
   if ((len != 2 && len != 3) || len != rhs.size())
     throw new ParseException("Cross: both sides must be of length 3");
   if (len == 3) {
     Vector res = new Vector(3);
     res.setSize(3);
     res.setElementAt(
         sub.sub(
             mul.mul(lhs.elementAt(1), rhs.elementAt(2)),
             mul.mul(lhs.elementAt(2), rhs.elementAt(1))),
         0);
     res.setElementAt(
         sub.sub(
             mul.mul(lhs.elementAt(2), rhs.elementAt(0)),
             mul.mul(lhs.elementAt(0), rhs.elementAt(2))),
         1);
     res.setElementAt(
         sub.sub(
             mul.mul(lhs.elementAt(0), rhs.elementAt(1)),
             mul.mul(lhs.elementAt(1), rhs.elementAt(0))),
         2);
     return res;
   } else {
     return sub.sub(
         mul.mul(lhs.elementAt(0), rhs.elementAt(1)), mul.mul(lhs.elementAt(1), rhs.elementAt(0)));
   }
 }
Ejemplo n.º 2
0
  public Object dot(Vector<Object> v1, Vector<Object> v2) throws ParseException {
    if (v1.size() != v2.size())
      throw new ParseException("Dot: both sides of dot must be same length");
    int len = v1.size();
    if (len < 1) throw new ParseException("Dot: empty vectors parsed");

    Object res = mul.mul(v1.elementAt(0), v2.elementAt(0));
    for (int i = 1; i < len; ++i) {
      res = add.add(res, mul.mul(v1.elementAt(i), v2.elementAt(i)));
    }
    return res;
  }