comparison armadillo-2.4.4/include/armadillo_bits/op_symmat_meat.hpp @ 0:8b6102e2a9b0

Armadillo Library

+// Copyright (C) 2011 NICTA (www.nicta.com.au)
+// Copyright (C) 2011 Conrad Sanderson
+// 
+// This file is part of the Armadillo C++ library.
+// It is provided without any warranty of fitness
+// for any purpose. You can redistribute this file
+// and/or modify it under the terms of the GNU
+// Lesser General Public License (LGPL) as published
+// by the Free Software Foundation, either version 3
+// of the License or (at your option) any later version.
+// (see http://www.opensource.org/licenses for more info)
+
+
+//! \addtogroup op_symmat
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+op_symmat::apply
+  (
+        Mat<typename T1::elem_type>& out,
+  const Op<T1,op_symmat>&            in,
+  const typename arma_not_cx<typename T1::elem_type>::result* junk
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  typedef typename T1::elem_type eT;
+  
+  const unwrap<T1> tmp(in.m);
+  const Mat<eT>& A = tmp.M;
+  
+  arma_debug_check( (A.is_square() == false), "symmatu()/symmatl(): given matrix must be square" );
+  
+  const uword  N     = A.n_rows;
+  const bool upper = (in.aux_uword_a == 0);
+  
+  if(&out != &A)
+    {
+    out.copy_size(A);
+    
+    if(upper)
+      {
+      // upper triangular: copy the diagonal and the elements above the diagonal
+      
+      for(uword i=0; i<N; ++i)
+        {
+        const eT* A_data   = A.colptr(i);
+              eT* out_data = out.colptr(i);
+        
+        arrayops::copy( out_data, A_data, i+1 );
+        }
+      }
+    else
+      {
+      // lower triangular: copy the diagonal and the elements below the diagonal
+      
+      for(uword i=0; i<N; ++i)
+        {
+        const eT* A_data   = A.colptr(i);
+              eT* out_data = out.colptr(i);
+        
+        arrayops::copy( &out_data[i], &A_data[i], N-i );
+        }
+      }
+    }
+  
+  
+  if(upper)
+    {
+    // reflect elements across the diagonal from upper triangle to lower triangle
+    
+    for(uword col=1; col < N; ++col)
+      {
+      const eT* coldata = out.colptr(col);
+      
+      for(uword row=0; row < col; ++row)
+        {
+        out.at(col,row) = coldata[row];
+        }
+      }
+    }
+  else
+    {
+    // reflect elements across the diagonal from lower triangle to upper triangle
+    
+    for(uword col=0; col < N; ++col)
+      {
+      const eT* coldata = out.colptr(col);
+      
+      for(uword row=(col+1); row < N; ++row)
+        {
+        out.at(col,row) = coldata[row];
+        }
+      }
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_symmat::apply
+  (
+        Mat<typename T1::elem_type>& out,
+  const Op<T1,op_symmat>&            in,
+  const typename arma_cx_only<typename T1::elem_type>::result* junk
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  typedef typename T1::elem_type eT;
+  
+  const unwrap<T1> tmp(in.m);
+  const Mat<eT>& A = tmp.M;
+  
+  arma_debug_check( (A.is_square() == false), "symmatu()/symmatl(): given matrix must be square" );
+  
+  const uword  N     = A.n_rows;
+  const bool upper = (in.aux_uword_a == 0);
+  
+  if(&out != &A)
+    {
+    out.copy_size(A);
+    
+    if(upper)
+      {
+      // upper triangular: copy the diagonal and the elements above the diagonal
+      
+      for(uword i=0; i<N; ++i)
+        {
+        const eT* A_data   = A.colptr(i);
+              eT* out_data = out.colptr(i);
+        
+        arrayops::copy( out_data, A_data, i+1 );
+        }
+      }
+    else
+      {
+      // lower triangular: copy the diagonal and the elements below the diagonal
+      
+      for(uword i=0; i<N; ++i)
+        {
+        const eT* A_data   = A.colptr(i);
+              eT* out_data = out.colptr(i);
+        
+        arrayops::copy( &out_data[i], &A_data[i], N-i );
+        }
+      }
+    }
+  
+  
+  if(upper)
+    {
+    // reflect elements across the diagonal from upper triangle to lower triangle
+    
+    for(uword col=1; col < N; ++col)
+      {
+      const eT* coldata = out.colptr(col);
+      
+      for(uword row=0; row < col; ++row)
+        {
+        out.at(col,row) = std::conj(coldata[row]);
+        }
+      }
+    }
+  else
+    {
+    // reflect elements across the diagonal from lower triangle to upper triangle
+    
+    for(uword col=0; col < N; ++col)
+      {
+      const eT* coldata = out.colptr(col);
+      
+      for(uword row=(col+1); row < N; ++row)
+        {
+        out.at(col,row) = std::conj(coldata[row]);
+        }
+      }
+    }
+  }
+
+
+
+//! @}