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l1_norm.hh
1 // Copyright (C) 2008, 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_X2V_L1_NORM_HH
27 # define MLN_FUN_X2V_L1_NORM_HH
28 
32 
33 # include <mln/core/concept/function.hh>
34 # include <mln/algebra/vec.hh>
35 # include <mln/math/abs.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace fun
42  {
43 
44  namespace x2v
45  {
46 
47  template <typename V>
48  struct l1_norm : public Function_v2v< l1_norm<V> >
49  {
50  typedef mln_coord(V) C;
51  typedef mln_sum(C) result;
52 
53  result operator()(const V& v) const;
54  };
55 
56 
57 # ifndef MLN_INCLUDE_ONLY
58 
59  template <typename V>
60  inline
61  typename l1_norm<V>::result
62  l1_norm<V>::operator()(const V& v) const
63  {
64  result res = 0;
65  for (unsigned i = 0; i < V::dim; ++i)
66  res += mln::math::abs(v[i]);
67  return res;
68  }
69 
70 # endif // ! MLN_INCLUDE_ONLY
71 
72  } // end of namespace mln::fun::x2v
73 
74  } // end of namespace mln::fun
75 
76 } // end of namespace mln
77 
78 
79 #endif // ! MLN_FUN_X2V_L1_NORM_HH