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1 // Copyright (C) 2008-2010 NICTA (www.nicta.com.au)
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2 // Copyright (C) 2008-2010 Conrad Sanderson
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3 //
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4 // This file is part of the Armadillo C++ library.
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5 // It is provided without any warranty of fitness
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6 // for any purpose. You can redistribute this file
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7 // and/or modify it under the terms of the GNU
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8 // Lesser General Public License (LGPL) as published
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9 // by the Free Software Foundation, either version 3
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10 // of the License or (at your option) any later version.
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11 // (see http://www.opensource.org/licenses for more info)
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12
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13
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14 //! \addtogroup fn_trunc_log
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15 //! @{
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16
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17
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18
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19 template<typename eT>
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20 inline
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21 static
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22 typename arma_float_only<eT>::result
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23 trunc_log(const eT x)
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24 {
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25 if(std::numeric_limits<eT>::is_iec559)
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26 {
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27 if(x == std::numeric_limits<eT>::infinity())
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28 {
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29 return Math<eT>::log_max();
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30 }
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31 else
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32 {
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33 return (x <= eT(0)) ? Math<eT>::log_min() : std::log(x);
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34 }
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35 }
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36 else
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37 {
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38 return std::log(x);
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39 }
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40 }
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41
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42
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43
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44 template<typename eT>
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45 inline
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46 static
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47 typename arma_integral_only<eT>::result
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48 trunc_log(const eT x)
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49 {
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50 return eT( trunc_log( double(x) ) );
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51 }
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52
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53
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54
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55 template<typename T>
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56 inline
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57 static
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58 std::complex<T>
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59 trunc_log(const std::complex<T>& x)
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60 {
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61 return std::log(x);
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62 }
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63
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64
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65
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66 template<typename T1>
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67 arma_inline
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68 const eOp<T1, eop_trunc_log>
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69 trunc_log(const Base<typename T1::elem_type,T1>& A)
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70 {
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71 arma_extra_debug_sigprint();
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72
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73 return eOp<T1, eop_trunc_log>(A.get_ref());
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74 }
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75
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76
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77
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78 template<typename T1>
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79 arma_inline
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80 const eOpCube<T1, eop_trunc_log>
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81 trunc_log(const BaseCube<typename T1::elem_type,T1>& A)
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82 {
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83 arma_extra_debug_sigprint();
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84
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85 return eOpCube<T1, eop_trunc_log>(A.get_ref());
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86 }
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87
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88
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89
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90 //! @}
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