diff armadillo-2.4.4/include/armadillo_bits/fn_accu.hpp @ 0:8b6102e2a9b0

Armadillo Library

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/armadillo-2.4.4/include/armadillo_bits/fn_accu.hpp	Wed Apr 11 09:27:06 2012 +0100
@@ -0,0 +1,279 @@
+// Copyright (C) 2008-2011 NICTA (www.nicta.com.au)
+// Copyright (C) 2008-2011 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 fn_accu
+//! @{
+
+
+
+//! accumulate the elements of a matrix
+template<typename T1>
+arma_hot
+inline
+typename T1::elem_type
+accu(const Base<typename T1::elem_type,T1>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type      eT;
+  typedef typename Proxy<T1>::ea_type ea_type;
+  
+  const Proxy<T1> A(X.get_ref());
+  
+  if(Proxy<T1>::prefer_at_accessor == false)
+    {
+          ea_type P      = A.get_ea();
+    const uword   n_elem = A.get_n_elem();
+    
+    eT val1 = eT(0);
+    eT val2 = eT(0);
+    
+    uword i,j;
+    
+    for(i=0, j=1; j<n_elem; i+=2, j+=2)
+      {
+      val1 += P[i];
+      val2 += P[j];
+      }
+    
+    if(i < n_elem)
+      {
+      val1 += P[i];
+      }
+    
+    return val1 + val2;
+    }
+  else
+    {
+    const uword n_rows = A.get_n_rows();
+    const uword n_cols = A.get_n_cols();
+    
+    eT val = eT(0);
+    
+    for(uword col=0; col<n_cols; ++col)
+      {
+      for(uword row=0; row<n_rows; ++row)
+        {
+        val += A.at(row,col);
+        }
+      }
+    
+    return val;
+    }
+  }
+
+
+
+//! explicit handling of Hamming norm (also known as zero norm)
+template<typename T1>
+arma_inline
+arma_warn_unused
+uword
+accu(const mtOp<uword,T1,op_rel_noteq>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const Proxy<T1> A(X.m);
+  
+  const uword n_elem = A.get_n_elem();
+  const eT    val    = X.aux;
+  
+  uword n_nonzero = 0;
+  for(uword i=0; i<n_elem; ++i)
+    {
+    if(A[i] != val)
+      {
+      ++n_nonzero;
+      }
+    }
+  
+  return n_nonzero;
+  }
+
+
+
+//! accumulate the elements of a cube
+template<typename T1>
+arma_hot
+arma_warn_unused
+inline
+typename T1::elem_type
+accu(const BaseCube<typename T1::elem_type,T1>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type          eT;
+  typedef typename ProxyCube<T1>::ea_type ea_type;
+  
+  const ProxyCube<T1> A(X.get_ref());
+  
+  if(ProxyCube<T1>::prefer_at_accessor == false)
+    {
+    
+          ea_type P      = A.get_ea();
+    const uword   n_elem = A.get_n_elem();
+    
+    eT val1 = eT(0);
+    eT val2 = eT(0);
+    
+    uword i,j;
+    
+    for(i=0, j=1; j<n_elem; i+=2, j+=2)
+      {
+      val1 += P[i];
+      val2 += P[j];
+      }
+    
+    if(i < n_elem)
+      {
+      val1 += P[i];
+      }
+    
+    return val1 + val2;
+    }
+  else
+    {
+    const uword n_rows   = A.get_n_rows();
+    const uword n_cols   = A.get_n_cols();
+    const uword n_slices = A.get_n_slices();
+    
+    eT val = eT(0);
+    
+    for(uword slice=0; slice<n_slices; ++slice)
+      {
+      for(uword col=0; col<n_cols; ++col)
+        {
+        for(uword row=0; row<n_rows; ++row)
+          {
+          val += A.at(row,col,slice);
+          }
+        }
+      }
+    
+    return val;
+    }
+  }
+
+
+
+//! accumulate the elements of a diagview
+template<typename eT>
+arma_pure
+arma_warn_unused
+inline
+eT
+accu(const diagview<eT>& X)
+  {
+  arma_extra_debug_sigprint();  
+  
+  const uword n_elem = X.n_elem;
+  
+  eT val = eT(0);
+  
+  for(uword i=0; i<n_elem; ++i)
+    {
+    val += X[i];
+    }
+  
+  return val;
+  }
+
+
+
+//! accumulate the elements of a subview (submatrix)
+template<typename eT>
+arma_pure
+arma_warn_unused
+inline
+eT
+accu(const subview<eT>& S)
+  {
+  arma_extra_debug_sigprint();  
+  
+  const uword S_n_rows = S.n_rows;
+  const uword S_n_cols = S.n_cols;
+  const uword S_n_elem = S.n_elem;
+  
+  eT val = eT(0);
+  
+  if(S_n_elem > 0)
+    {
+    for(uword col=0; col<S_n_cols; ++col)
+      {
+      val += arrayops::accumulate( S.colptr(col), S_n_rows );
+      }
+    }
+  
+  return val;
+  }
+
+
+
+//! accumulate the elements of a subview_row
+template<typename eT>
+arma_pure
+arma_warn_unused
+inline
+eT
+accu(const subview_row<eT>& S)
+  {
+  arma_extra_debug_sigprint();  
+  
+  const Mat<eT>& X = S.m;
+  
+  const uword n_elem     = S.n_elem;
+  const uword row        = S.aux_row1;
+  const uword start_col  = S.aux_col1;
+  const uword end_col_p1 = start_col + S.n_cols;
+  
+  eT val = eT(0);
+    
+  if(n_elem > 0)
+    {
+    uword i,j;
+    
+    for(i=start_col, j=start_col+1; j < end_col_p1; i+=2, j+=2)
+      {
+      val += X.at(row,i);
+      val += X.at(row,j);
+      }
+    
+    if(i < end_col_p1)
+      {
+      val += X.at(row,i);
+      }
+    }
+  
+  return val;
+  }
+
+
+
+//! accumulate the elements of a subview_col
+template<typename eT>
+arma_pure
+arma_warn_unused
+inline
+eT
+accu(const subview_col<eT>& S)
+  {
+  arma_extra_debug_sigprint();
+  
+  return (S.n_elem > 0) ? arrayops::accumulate( S.colptr(0), S.n_rows ) : eT(0);
+  }
+
+
+
+//! @}