SHOGUN  3.2.1
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LogPlusOne.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 
15 
16 using namespace shogun;
17 
20 {
21 }
22 
23 
25 {
26 }
27 
29 bool CLogPlusOne::init(CFeatures* features)
30 {
31  ASSERT(features->get_feature_class()==C_DENSE)
32  ASSERT(features->get_feature_type()==F_DREAL)
33 
34  return true;
35 }
36 
39 {
40 }
41 
43 bool CLogPlusOne::load(FILE* f)
44 {
47  return false;
48 }
49 
51 bool CLogPlusOne::save(FILE* f)
52 {
55  return false;
56 }
57 
62 {
63  SGMatrix<float64_t> feature_matrix =
64  ((CDenseFeatures<float64_t>*)features)->get_feature_matrix();
65 
66  for (int32_t i=0; i<feature_matrix.num_cols; i++)
67  {
68  for (int32_t j=0; j<feature_matrix.num_rows; j++)
69  feature_matrix.matrix[i*feature_matrix.num_rows+j] =
70  CMath::log(feature_matrix.matrix[i*feature_matrix.num_rows+j]+1.0);
71  }
72  return feature_matrix;
73 }
74 
78 {
79  float64_t* log_vec = SG_MALLOC(float64_t, vector.vlen);
80 
81  for (int32_t i=0; i<vector.vlen; i++)
82  log_vec[i]=CMath::log(vector.vector[i]+1.0);
83 
84  return SGVector<float64_t>(log_vec,vector.vlen);
85 }

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