MorisitaHorn { public static double distance(double[] v1,double[] v2){ Asserts.assertEqualLength(v1, v2); Asserts.assertGreaterOrEqualThanValue(v1, 0); Asserts.assertGreaterOrEqualThanValue(v2, 0); double meanV1 = CommonStats.mean(v1); double meanV2 = CommonStats.mean(v2); return (2*CommonStats.dotProduct(v1, v2))/((Math.pow(CommonStats.norm(v1), 2)*(meanV2/meanV1))+(Math.pow(CommonStats.norm(v2), 2)*(meanV1/meanV2))); }  static double distance(double[] v1,double[] v2);  }
@Test public void test1(){ double[] v1 = new double[]{8,3,7}; double[] v2 = new double[]{9,8,4}; Asserts.assertEqualLength(v1, v2); double res = MorisitaHorn.distance(v1, v2); Asserts.assertEquals(res, 0.884661117717); }
@Test public void test2(){ double[] v1 = new double[]{8,32,7,0,45}; double[] v2 = new double[]{97,78,41,4,78}; Asserts.assertEqualLength(v1, v2); double res = MorisitaHorn.distance(v1, v2); Asserts.assertEquals(res, 0.81125161207014); }
@Test public void test3(){ double[] v1 = new double[]{248.124,321.574,788.14,0.001,459.298}; double[] v2 = new double[]{97.145,78.658,417.0004,4.02,7865.3594}; Asserts.assertEqualLength(v1, v2); double res = MorisitaHorn.distance(v1, v2); Asserts.assertEquals(res, 0.44417795356709); }