Weird math calculations.

[Karthik Vishwanath]

Hi all,
        The attached file just tries to define a simple "cross product"
between two vectors. the results are incorrect and i don't know why.
I run jdk1.1.7 on glibc, RedHat 5.1 on a 200Mhz Pc. 

Thanks in advance,
-Karthik.

+-----------------------------------------------------------------+
| Karthik Vishwanath, Junior Research Fellow,                     |
| National Centre for Biological Sciences, TIFR Bangalore, India. |
| Ph[Off]: (080)8561657/58/59/71/72; 8462895, Ext. 3231           |
| mail to:  [EMAIL PROTECTED]                                   |
| Alt mail: [EMAIL PROTECTED]                           |
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Microsoft isn't the answer. 
Microsoft is the question and the answer is NO.




public class aVectorUtil
{
        public double x;
        public double y;
        public double z;

        public static void main(String argv[])
        {
                aVectorUtil u = new aVectorUtil(1.0, 2.0, 0.0);
                aVectorUtil v = new aVectorUtil(0.0, 0.0, 1.0);

                u.print();
                v.print();
                u.cross(u,v);
                u.print();
        }
        public aVectorUtil(double x1, double y1, double z1)
        {
                this.x = x1;
                this.y = y1;
                this.z = z1;
        }

        public void cross(aVectorUtil v1, aVectorUtil v2)
        {
                this.x = (v1.y*v2.z) - (v1.z-v2.y);
                this.y = (v1.z*v2.x) - (v1.x*v2.z);
                this.z = (v1.x*v2.y) - (v1.y*v2.x);
        }

        public void print()
        {
                System.out.println("(x,y,z) = ("+ this.x +","+this.y+","+this.z +")");
        }
}