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1 // Copyright (C) 2009-2010 NICTA (www.nicta.com.au)
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2 // Copyright (C) 2009-2010 Conrad Sanderson
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3 // Copyright (C) 2009-2010 Dimitrios Bouzas
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4 //
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5 // This file is part of the Armadillo C++ library.
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6 // It is provided without any warranty of fitness
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7 // for any purpose. You can redistribute this file
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8 // and/or modify it under the terms of the GNU
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9 // Lesser General Public License (LGPL) as published
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10 // by the Free Software Foundation, either version 3
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11 // of the License or (at your option) any later version.
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12 // (see http://www.opensource.org/licenses for more info)
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13
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14
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15
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16 //! \addtogroup fn_eps
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17 //! @{
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18
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19
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20
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21 //! \brief
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22 //! eps version for non-complex matrices and vectors
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23 template<typename T1>
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24 inline
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25 const eOp<T1, eop_eps>
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26 eps(const Base<typename T1::elem_type, T1>& X, const typename arma_not_cx<typename T1::elem_type>::result* junk = 0)
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27 {
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28 arma_extra_debug_sigprint();
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29
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30 arma_ignore(junk);
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31
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32 typedef typename T1::elem_type eT;
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33
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34 return eOp<T1, eop_eps>(X.get_ref());
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35 }
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36
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37
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38
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39 //! \brief
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40 //! eps version for complex matrices and vectors
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41 template<typename T1>
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42 inline
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43 Mat< typename T1::pod_type >
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44 eps(const Base< std::complex<typename T1::pod_type>, T1>& X, const typename arma_cx_only<typename T1::elem_type>::result* junk = 0)
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45 {
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46 arma_extra_debug_sigprint();
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47
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48 arma_ignore(junk);
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49
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50 typedef typename T1::pod_type T;
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51 typedef typename T1::elem_type eT;
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52
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53 const unwrap<T1> tmp(X.get_ref());
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54 const Mat<eT>& A = tmp.M;
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55
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56 Mat<T> out(A.n_rows, A.n_cols);
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57
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58 T* out_mem = out.memptr();
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59 const eT* A_mem = A.memptr();
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60 const uword n_elem = A.n_elem;
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61
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62 for(uword i=0; i<n_elem; ++i)
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63 {
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64 out_mem[i] = eop_aux::direct_eps( A_mem[i] );
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65 }
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66
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67
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68 return out;
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69 }
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70
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71
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72
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73 template<typename eT>
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74 arma_inline
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75 arma_warn_unused
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76 typename arma_integral_only<eT>::result
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77 eps(const eT& x)
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78 {
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79 arma_ignore(x);
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80
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81 return eT(0);
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82 }
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83
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84
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85
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86 template<typename eT>
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87 arma_inline
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88 arma_warn_unused
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89 typename arma_float_only<eT>::result
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90 eps(const eT& x)
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91 {
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92 return eop_aux::direct_eps(x);
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93 }
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94
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95
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96
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97 template<typename T>
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98 arma_inline
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99 arma_warn_unused
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100 typename arma_float_only<T>::result
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101 eps(const std::complex<T>& x)
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102 {
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103 return eop_aux::direct_eps(x);
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104 }
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105
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106
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107
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108 //! @}
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