%line	%branch
net.sf.classifier4J.vector.VectorUtils	96%	100%

1
2		package net.sf.classifier4J.vector;
3
4
5	0	public class VectorUtils {
6		public static int scalarProduct(class="keyword">int[] one, class="keyword">int[] two) throws IllegalArgumentException {
7	24	if ((one == null) || (two == class="keyword">null)) {
8	4	throw new IllegalArgumentException("Arguments cannot be null");
9		}
10
11	20	if (one.length != two.length) {
12	2	throw new IllegalArgumentException("Arguments of different length are not allowed");
13		}
14
15	18	int result = 0;
16	88	for (int i = 0; i < one.length; i++) {
17	70	result += one[i] * two[i];
18		}
19	18	return result;
20		}
21
22		public static double vectorLength(int[] vector) throws IllegalArgumentException {
23	36	if (vector == null) {
24	2	throw new IllegalArgumentException("Arguments cannot be null");
25		}
26
27	34	double sumOfSquares = 0d;
28	182	for (int i = 0; i < vector.length; i++) {
29	148	sumOfSquares = sumOfSquares + (vector[i] * vector[i]);
30		}
31
32	34	return Math.sqrt(sumOfSquares);
33		}
34
35		public static double cosineOfVectors(int[] one, class="keyword">int[] two) throws IllegalArgumentException {
36	20	if ((one == null) || (two == class="keyword">null)) {
37	4	throw new IllegalArgumentException("Arguments cannot be null");
38		}
39
40	16	if (one.length != two.length) {
41	2	throw new IllegalArgumentException("Arguments of different length are not allowed");
42		}
43	14	double denominater = (vectorLength(one) * vectorLength(two));
44	14	if (denominater == 0) {
45	4	return 0;
46		} else {
47	10	return (scalarProduct(one, two)/denominater);
48		}
49		}
50		}

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