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NormOne.cpp
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1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 3 of the License, or
5  * (at your option) any later version.
6  *
7  * Written (W) 1999-2009 Soeren Sonnenburg
8  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  */
10 
16 
17 using namespace shogun;
18 
21 {
22 }
23 
25 {
26 }
27 
29 bool CNormOne::init(CFeatures* features)
30 {
31  ASSERT(features->get_feature_class()==C_SIMPLE);
32  ASSERT(features->get_feature_type()==F_DREAL);
33 
34  return true;
35 }
36 
39 {
40 }
41 
43 bool CNormOne::load(FILE* f)
44 {
47  return false;
48 }
49 
51 bool CNormOne::save(FILE* f)
52 {
55  return false;
56 }
57 
62 {
63  SGMatrix<float64_t> feature_matrix=((CSimpleFeatures<float64_t>*)features)->get_feature_matrix();
64 
65  for (int32_t i=0; i<feature_matrix.num_cols; i++)
66  {
67  float64_t* vec= &(feature_matrix.matrix[i*feature_matrix.num_rows]);
68  float64_t norm=CMath::sqrt(CMath::dot(vec, vec, feature_matrix.num_rows));
69  CMath::scale_vector(1.0/norm, vec, feature_matrix.num_rows);
70  }
71  return feature_matrix;
72 }
73 
77 {
78  float64_t* normed_vec = SG_MALLOC(float64_t, vector.vlen);
79  float64_t norm=CMath::sqrt(CMath::dot(vector.vector, vector.vector, vector.vlen));
80 
81  for (int32_t i=0; i<vector.vlen; i++)
82  normed_vec[i]=vector.vector[i]/norm;
83 
84  return SGVector<float64_t>(normed_vec,vector.vlen);
85 }

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