operator_minus.hpp

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00001 // Copyright (C) 2010 NICTA and the authors listed below
00002 // http://nicta.com.au
00003 // 
00004 // Authors:
00005 // - Conrad Sanderson (conradsand at ieee dot org)
00006 // 
00007 // This file is part of the Armadillo C++ library.
00008 // It is provided without any warranty of fitness
00009 // for any purpose. You can redistribute this file
00010 // and/or modify it under the terms of the GNU
00011 // Lesser General Public License (LGPL) as published
00012 // by the Free Software Foundation, either version 3
00013 // of the License or (at your option) any later version.
00014 // (see http://www.opensource.org/licenses for more info)
00015 
00016 
00017 //! \addtogroup operator_minus
00018 //! @{
00019 
00020 
00021 
00022 //! unary -
00023 template<typename T1>
00024 arma_inline
00025 const eOp<T1, eop_neg>
00026 operator-
00027 (const Base<typename T1::elem_type,T1>& X)
00028   {
00029   arma_extra_debug_sigprint();
00030   
00031   return eOp<T1,eop_neg>(X.get_ref());
00032   }
00033 
00034 
00035 
00036 //! cancellation of two consecutive negations: -(-T1)
00037 template<typename T1>
00038 arma_inline
00039 const T1&
00040 operator-
00041 (const eOp<T1, eop_neg>& X)
00042   {
00043   arma_extra_debug_sigprint();
00044   
00045   return X.m;
00046   }
00047 
00048 
00049 
00050 //! Base - scalar
00051 template<typename T1>
00052 arma_inline
00053 const eOp<T1, eop_scalar_minus_post>
00054 operator-
00055   (
00056   const Base<typename T1::elem_type,T1>& X,
00057   const typename T1::elem_type           k
00058   )
00059   {
00060   arma_extra_debug_sigprint();
00061   
00062   return eOp<T1, eop_scalar_minus_post>(X.get_ref(), k);
00063   }
00064 
00065 
00066 
00067 //! scalar - Base
00068 template<typename T1>
00069 arma_inline
00070 const eOp<T1, eop_scalar_minus_pre>
00071 operator-
00072   (
00073   const typename T1::elem_type           k,
00074   const Base<typename T1::elem_type,T1>& X
00075   )
00076   {
00077   arma_extra_debug_sigprint();
00078   
00079   return eOp<T1, eop_scalar_minus_pre>(X.get_ref(), k);
00080   }
00081 
00082 
00083 
00084 //! subtraction of Base objects with same element type
00085 template<typename T1, typename T2>
00086 arma_inline
00087 const eGlue<T1, T2, eglue_minus>
00088 operator-
00089   (
00090   const Base<typename T1::elem_type,T1>& X,
00091   const Base<typename T1::elem_type,T2>& Y
00092   )
00093   {
00094   arma_extra_debug_sigprint();
00095   
00096   return eGlue<T1, T2, eglue_minus>(X.get_ref(), Y.get_ref());
00097   }
00098 
00099 
00100 
00101 //! subtraction of Base objects with different element types
00102 template<typename T1, typename T2>
00103 arma_inline
00104 Mat<typename promote_type<typename T1::elem_type, typename T2::elem_type>::result>
00105 operator-
00106   (
00107   const Base< typename force_different_type<typename T1::elem_type, typename T2::elem_type>::T1_result, T1>& X,
00108   const Base< typename force_different_type<typename T1::elem_type, typename T2::elem_type>::T2_result, T2>& Y
00109   )
00110   {
00111   arma_extra_debug_sigprint();
00112   
00113   typedef typename T1::elem_type eT1;
00114   typedef typename T2::elem_type eT2;
00115   
00116   typedef typename promote_type<eT1,eT2>::result out_eT;
00117   
00118   promote_type<eT1,eT2>::check();
00119   
00120   const Proxy<T1> A(X.get_ref());
00121   const Proxy<T2> B(Y.get_ref());
00122   
00123   arma_debug_assert_same_size(A, B, "matrix subtraction");
00124   
00125   Mat<out_eT> out(A.n_rows, A.n_cols);
00126 
00127         out_eT* out_mem = out.memptr();
00128   const u32     n_elem  = out.n_elem;
00129   
00130   for(u32 i=0; i<n_elem; ++i)
00131     {
00132     out_mem[i] = upgrade_val<eT1,eT2>::apply(A[i]) - upgrade_val<eT1,eT2>::apply(B[i]);
00133     }
00134   
00135   return out;
00136   }
00137 
00138 
00139 
00140 //! @}