From eda5bc26f44ee9a6f83dcf8c91f17296d7fc509d Mon Sep 17 00:00:00 2001
From: Nao Pross <np@0hm.ch>
Date: Mon, 12 Feb 2024 14:52:43 +0100
Subject: Move into version control

---
 .../include/armadillo_bits/spdiagview_meat.hpp     | 1073 ++++++++++++++++++++
 1 file changed, 1073 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/spdiagview_meat.hpp

(limited to 'src/armadillo/include/armadillo_bits/spdiagview_meat.hpp')

diff --git a/src/armadillo/include/armadillo_bits/spdiagview_meat.hpp b/src/armadillo/include/armadillo_bits/spdiagview_meat.hpp
new file mode 100644
index 0000000..603cadc
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/spdiagview_meat.hpp
@@ -0,0 +1,1073 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup spdiagview
+//! @{
+
+
+template<typename eT>
+inline
+spdiagview<eT>::~spdiagview()
+  {
+  arma_extra_debug_sigprint();
+  }
+
+
+template<typename eT>
+arma_inline
+spdiagview<eT>::spdiagview(const SpMat<eT>& in_m, const uword in_row_offset, const uword in_col_offset, const uword in_len)
+  : m(in_m)
+  , row_offset(in_row_offset)
+  , col_offset(in_col_offset)
+  , n_rows(in_len)
+  , n_elem(in_len)
+  {
+  arma_extra_debug_sigprint();
+  }
+
+
+
+//! set a diagonal of our matrix using a diagonal from a foreign matrix
+template<typename eT>
+inline
+void
+spdiagview<eT>::operator= (const spdiagview<eT>& x)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  arma_debug_check( (d.n_elem != x.n_elem), "spdiagview: diagonals have incompatible lengths" );
+  
+        SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  const SpMat<eT>& x_m = x.m;
+  
+  if( (&d_m == &x_m) || ((d.row_offset == 0) && (d.col_offset == 0)) )
+    {
+    const Mat<eT> tmp(x);
+    
+    (*this).operator=(tmp);
+    }
+  else
+    {
+    const uword d_n_elem     = d.n_elem;
+    const uword d_row_offset = d.row_offset;
+    const uword d_col_offset = d.col_offset;
+    
+    const uword x_row_offset = x.row_offset;
+    const uword x_col_offset = x.col_offset;
+    
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) = x_m.at(i + x_row_offset, i + x_col_offset);
+      }
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::operator+=(const eT val)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(val == eT(0))  { return; }
+  
+  SpMat<eT>& t_m = const_cast< SpMat<eT>& >(m);
+  
+  const uword t_n_elem     = n_elem;
+  const uword t_row_offset = row_offset;
+  const uword t_col_offset = col_offset;
+  
+  for(uword i=0; i < t_n_elem; ++i)
+    {
+    t_m.at(i + t_row_offset, i + t_col_offset) += val;
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::operator-=(const eT val)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(val == eT(0))  { return; }
+  
+  SpMat<eT>& t_m = const_cast< SpMat<eT>& >(m);
+  
+  const uword t_n_elem     = n_elem;
+  const uword t_row_offset = row_offset;
+  const uword t_col_offset = col_offset;
+  
+  for(uword i=0; i < t_n_elem; ++i)
+    {
+    t_m.at(i + t_row_offset, i + t_col_offset) -= val;
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::operator*=(const eT val)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(val == eT(0))  { (*this).zeros(); return; }
+  
+  SpMat<eT>& t_m = const_cast< SpMat<eT>& >(m);
+  
+  const uword t_n_elem     = n_elem;
+  const uword t_row_offset = row_offset;
+  const uword t_col_offset = col_offset;
+  
+  for(uword i=0; i < t_n_elem; ++i)
+    {
+    t_m.at(i + t_row_offset, i + t_col_offset) *= val;
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::operator/=(const eT val)
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<eT>& t_m = const_cast< SpMat<eT>& >(m);
+  
+  const uword t_n_elem     = n_elem;
+  const uword t_row_offset = row_offset;
+  const uword t_col_offset = col_offset;
+  
+  for(uword i=0; i < t_n_elem; ++i)
+    {
+    t_m.at(i + t_row_offset, i + t_col_offset) /= val;
+    }
+  }
+
+
+
+//! set a diagonal of our matrix using data from a foreign object
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator= (const Base<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  if(is_same_type< T1, Gen<Col<eT>, gen_zeros> >::yes)
+    {
+    const Proxy<T1> P(o.get_ref());
+    
+    arma_debug_check( (d_n_elem != P.get_n_elem()), "spdiagview: given object has incompatible size" );
+    
+    (*this).zeros();
+    
+    return;
+    }
+  
+  if(is_same_type< T1, Gen<Col<eT>, gen_ones> >::yes)
+    {
+    const Proxy<T1> P(o.get_ref());
+    
+    arma_debug_check( (d_n_elem != P.get_n_elem()), "spdiagview: given object has incompatible size" );
+    
+    (*this).ones();
+    
+    return;
+    }
+  
+  const quasi_unwrap<T1> U(o.get_ref());
+  const Mat<eT>& x     = U.M;
+  
+  const eT* x_mem = x.memptr();
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != x.n_elem) || ((x.n_rows != 1) && (x.n_cols != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( (d_row_offset == 0) && (d_col_offset == 0) )
+    {
+    SpMat<eT> tmp1;
+    
+    tmp1.eye(d_m.n_rows, d_m.n_cols);
+    
+    bool has_zero = false;
+    
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      const eT val = x_mem[i];
+      
+      access::rw(tmp1.values[i]) = val;
+      
+      if(val == eT(0))  { has_zero = true; }
+      }
+    
+    if(has_zero)  { tmp1.remove_zeros(); }
+    
+    if(tmp1.n_nonzero == 0)  { (*this).zeros(); return; }
+    
+    SpMat<eT> tmp2;
+    
+    spglue_merge::diagview_merge(tmp2, d_m, tmp1);
+    
+    d_m.steal_mem(tmp2);
+    }
+  else
+    {
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) = x_mem[i];
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator+=(const Base<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+    
+  const Proxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( (is_Mat<typename Proxy<T1>::stored_type>::value) || (Proxy<T1>::use_at) )
+    {
+    const unwrap<typename Proxy<T1>::stored_type> tmp(P.Q);
+    const Mat<eT>& x = tmp.M;
+    
+    const eT* x_mem = x.memptr();
+
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) += x_mem[i];
+      }
+    }
+  else
+    {
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+      
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) += Pea[i];
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator-=(const Base<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+    
+  const Proxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( (is_Mat<typename Proxy<T1>::stored_type>::value) || (Proxy<T1>::use_at) )
+    {
+    const unwrap<typename Proxy<T1>::stored_type> tmp(P.Q);
+    const Mat<eT>& x = tmp.M;
+    
+    const eT* x_mem = x.memptr();
+
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) -= x_mem[i];
+      }
+    }
+  else
+    {
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+      
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) -= Pea[i];
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator%=(const Base<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+    
+  const Proxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( (is_Mat<typename Proxy<T1>::stored_type>::value) || (Proxy<T1>::use_at) )
+    {
+    const unwrap<typename Proxy<T1>::stored_type> tmp(P.Q);
+    const Mat<eT>& x = tmp.M;
+    
+    const eT* x_mem = x.memptr();
+
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) *= x_mem[i];
+      }
+    }
+  else
+    {
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+      
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) *= Pea[i];
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator/=(const Base<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+    
+  const Proxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( (is_Mat<typename Proxy<T1>::stored_type>::value) || (Proxy<T1>::use_at) )
+    {
+    const unwrap<typename Proxy<T1>::stored_type> tmp(P.Q);
+    const Mat<eT>& x = tmp.M;
+    
+    const eT* x_mem = x.memptr();
+
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) /= x_mem[i];
+      }
+    }
+  else
+    {
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+      
+    for(uword i=0; i < d_n_elem; ++i)
+      {
+      d_m.at(i + d_row_offset, i + d_col_offset) /= Pea[i];
+      }
+    }
+  }
+
+
+
+//! set a diagonal of our matrix using data from a foreign object
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator= (const SpBase<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  const unwrap_spmat<T1> U( o.get_ref() );
+  const SpMat<eT>& x   = U.M;
+  
+  arma_debug_check
+    (
+    ( (n_elem != x.n_elem) || ((x.n_rows != 1) && (x.n_cols != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  const Mat<eT> tmp(x);
+  
+  (*this).operator=(tmp);
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator+=(const SpBase<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  const SpProxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( SpProxy<T1>::use_iterator || P.is_alias(d_m) )
+    {
+    const SpMat<eT> tmp(P.Q);
+    
+    if(tmp.n_cols == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) += tmp.at(i,0); }
+      }
+    else
+    if(tmp.n_rows == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) += tmp.at(0,i); }
+      }
+    }
+  else
+    {
+    if(P.get_n_cols() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) += P.at(i,0); }
+      }
+    else
+    if(P.get_n_rows() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) += P.at(0,i); }
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator-=(const SpBase<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  const SpProxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( SpProxy<T1>::use_iterator || P.is_alias(d_m) )
+    {
+    const SpMat<eT> tmp(P.Q);
+    
+    if(tmp.n_cols == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) -= tmp.at(i,0); }
+      }
+    else
+    if(tmp.n_rows == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) -= tmp.at(0,i); }
+      }
+    }
+  else
+    {
+    if(P.get_n_cols() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) -= P.at(i,0); }
+      }
+    else
+    if(P.get_n_rows() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) -= P.at(0,i); }
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator%=(const SpBase<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  const SpProxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( SpProxy<T1>::use_iterator || P.is_alias(d_m) )
+    {
+    const SpMat<eT> tmp(P.Q);
+    
+    if(tmp.n_cols == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) *= tmp.at(i,0); }
+      }
+    else
+    if(tmp.n_rows == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) *= tmp.at(0,i); }
+      }
+    }
+  else
+    {
+    if(P.get_n_cols() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) *= P.at(i,0); }
+      }
+    else
+    if(P.get_n_rows() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) *= P.at(0,i); }
+      }
+    }
+  }
+
+
+
+template<typename eT>
+template<typename T1>
+inline
+void
+spdiagview<eT>::operator/=(const SpBase<eT,T1>& o)
+  {
+  arma_extra_debug_sigprint();
+  
+  spdiagview<eT>& d = *this;
+  
+  SpMat<eT>& d_m = const_cast< SpMat<eT>& >(d.m);
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  const SpProxy<T1> P( o.get_ref() );
+  
+  arma_debug_check
+    (
+    ( (d_n_elem != P.get_n_elem()) || ((P.get_n_rows() != 1) && (P.get_n_cols() != 1)) ),
+    "spdiagview: given object has incompatible size"
+    );
+  
+  if( SpProxy<T1>::use_iterator || P.is_alias(d_m) )
+    {
+    const SpMat<eT> tmp(P.Q);
+    
+    if(tmp.n_cols == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) /= tmp.at(i,0); }
+      }
+    else
+    if(tmp.n_rows == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) /= tmp.at(0,i); }
+      }
+    }
+  else
+    {
+    if(P.get_n_cols() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) /= P.at(i,0); }
+      }
+    else
+    if(P.get_n_rows() == 1)
+      {
+      for(uword i=0; i < d_n_elem; ++i)  { d_m.at(i + d_row_offset, i + d_col_offset) /= P.at(0,i); }
+      }
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::extract(SpMat<eT>& out, const spdiagview<eT>& d)
+  {
+  arma_extra_debug_sigprint();
+  
+  const SpMat<eT>& d_m = d.m;
+  
+  const uword d_n_elem     = d.n_elem;
+  const uword d_row_offset = d.row_offset;
+  const uword d_col_offset = d.col_offset;
+  
+  Col<eT> cache(d_n_elem, arma_nozeros_indicator());
+  eT* cache_mem = cache.memptr();
+  
+  uword d_n_nonzero = 0;
+  
+  for(uword i=0; i < d_n_elem; ++i)
+    {
+    const eT val = d_m.at(i + d_row_offset, i + d_col_offset);
+    
+    cache_mem[i] = val;
+    
+    d_n_nonzero += (val != eT(0)) ? uword(1) : uword(0);
+    }
+  
+  out.reserve(d_n_elem, 1, d_n_nonzero);
+  
+  uword count = 0;
+  for(uword i=0; i < d_n_elem; ++i)
+    {
+    const eT val = cache_mem[i];
+    
+    if(val != eT(0))
+      {
+      access::rw(out.row_indices[count]) = i;
+      access::rw(out.values[count])      = val;
+      ++count;
+      }
+    }
+  
+  access::rw(out.col_ptrs[0]) = 0;
+  access::rw(out.col_ptrs[1]) = d_n_nonzero;
+  }
+
+
+
+//! extract a diagonal and store it as a dense column vector
+template<typename eT>
+inline
+void
+spdiagview<eT>::extract(Mat<eT>& out, const spdiagview<eT>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  // NOTE: we're assuming that the 'out' matrix has already been set to the correct size;
+  // size setting is done by either the Mat contructor or Mat::operator=()
+  
+  const SpMat<eT>& in_m = in.m;
+  
+  const uword in_n_elem     = in.n_elem;
+  const uword in_row_offset = in.row_offset;
+  const uword in_col_offset = in.col_offset;
+  
+  eT* out_mem = out.memptr();
+  
+  for(uword i=0; i < in_n_elem; ++i)
+    {
+    out_mem[i] = in_m.at(i + in_row_offset, i + in_col_offset);
+    }
+  }
+
+
+
+template<typename eT>
+inline
+SpMat_MapMat_val<eT>
+spdiagview<eT>::operator[](const uword i)
+  {
+  return (const_cast< SpMat<eT>& >(m)).at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+eT
+spdiagview<eT>::operator[](const uword i) const
+  {
+  return m.at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+SpMat_MapMat_val<eT>
+spdiagview<eT>::at(const uword i)
+  {
+  return (const_cast< SpMat<eT>& >(m)).at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+eT
+spdiagview<eT>::at(const uword i) const
+  {
+  return m.at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+SpMat_MapMat_val<eT>
+spdiagview<eT>::operator()(const uword i)
+  {
+  arma_debug_check_bounds( (i >= n_elem), "spdiagview::operator(): out of bounds" );
+  
+  return (const_cast< SpMat<eT>& >(m)).at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+eT
+spdiagview<eT>::operator()(const uword i) const
+  {
+  arma_debug_check_bounds( (i >= n_elem), "spdiagview::operator(): out of bounds" );
+  
+  return m.at(i+row_offset, i+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+SpMat_MapMat_val<eT>
+spdiagview<eT>::at(const uword row, const uword)
+  {
+  return (const_cast< SpMat<eT>& >(m)).at(row+row_offset, row+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+eT
+spdiagview<eT>::at(const uword row, const uword) const
+  {
+  return m.at(row+row_offset, row+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+SpMat_MapMat_val<eT>
+spdiagview<eT>::operator()(const uword row, const uword col)
+  {
+  arma_debug_check_bounds( ((row >= n_elem) || (col > 0)), "spdiagview::operator(): out of bounds" );
+  
+  return (const_cast< SpMat<eT>& >(m)).at(row+row_offset, row+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+eT
+spdiagview<eT>::operator()(const uword row, const uword col) const
+  {
+  arma_debug_check_bounds( ((row >= n_elem) || (col > 0)), "spdiagview::operator(): out of bounds" );
+  
+  return m.at(row+row_offset, row+col_offset);
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::replace(const eT old_val, const eT new_val)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(old_val == eT(0))
+    {
+    arma_debug_warn_level(1, "spdiagview::replace(): replacement not done, as old_val = 0");
+    }
+  else
+    {
+    Mat<eT> tmp(*this);
+    
+    tmp.replace(old_val, new_val);
+    
+    (*this).operator=(tmp);
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::clean(const typename get_pod_type<eT>::result threshold)
+  {
+  arma_extra_debug_sigprint();
+  
+  Mat<eT> tmp(*this);
+  
+  tmp.clean(threshold);
+  
+  (*this).operator=(tmp);
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::clamp(const eT min_val, const eT max_val)
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<eT> tmp(*this);
+  
+  tmp.clamp(min_val, max_val);
+  
+  (*this).operator=(tmp);
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::fill(const eT val)
+  {
+  arma_extra_debug_sigprint();
+  
+  if( (row_offset == 0) && (col_offset == 0) && (m.sync_state != 1) )
+    {
+    if(val == eT(0))
+      {
+      SpMat<eT> tmp(arma_reserve_indicator(), m.n_rows, m.n_cols, m.n_nonzero);  // worst case scenario
+      
+      typename SpMat<eT>::const_iterator it     = m.begin();
+      typename SpMat<eT>::const_iterator it_end = m.end();
+      
+      uword count = 0;
+        
+      for(; it != it_end; ++it)
+        {
+        const uword row = it.row();
+        const uword col = it.col();
+        
+        if(row != col)
+          {
+          access::rw(tmp.values[count])      = (*it);
+          access::rw(tmp.row_indices[count]) = row;
+          access::rw(tmp.col_ptrs[col + 1])++;
+          ++count;
+          }
+        }
+      
+      for(uword i=0; i < tmp.n_cols; ++i)
+        {
+        access::rw(tmp.col_ptrs[i + 1]) += tmp.col_ptrs[i];
+        }
+      
+      // quick resize without reallocating memory and copying data
+      access::rw(         tmp.n_nonzero) = count;
+      access::rw(     tmp.values[count]) = eT(0);
+      access::rw(tmp.row_indices[count]) = uword(0);
+      
+      access::rw(m).steal_mem(tmp);
+      }
+    else  // val != eT(0)
+      {
+      SpMat<eT> tmp1;
+      
+      tmp1.eye(m.n_rows, m.n_cols);
+      
+      if(val != eT(1))  { tmp1 *= val; }
+      
+      SpMat<eT> tmp2;
+      
+      spglue_merge::diagview_merge(tmp2, m, tmp1);
+      
+      access::rw(m).steal_mem(tmp2);
+      }
+    }
+  else
+    {
+    SpMat<eT>& x = const_cast< SpMat<eT>& >(m);
+    
+    const uword local_n_elem = n_elem;
+    
+    for(uword i=0; i < local_n_elem; ++i)
+      {
+      x.at(i+row_offset, i+col_offset) = val;
+      }
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::zeros()
+  {
+  arma_extra_debug_sigprint();
+  
+  (*this).fill(eT(0));
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::ones()
+  {
+  arma_extra_debug_sigprint();
+  
+  (*this).fill(eT(1));
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::randu()
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<eT>& x = const_cast< SpMat<eT>& >(m);
+  
+  const uword local_n_elem = n_elem;
+  
+  for(uword i=0; i < local_n_elem; ++i)
+    {
+    x.at(i+row_offset, i+col_offset) = eT(arma_rng::randu<eT>());
+    }
+  }
+
+
+
+template<typename eT>
+inline
+void
+spdiagview<eT>::randn()
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<eT>& x = const_cast< SpMat<eT>& >(m);
+  
+  const uword local_n_elem = n_elem;
+  
+  for(uword i=0; i < local_n_elem; ++i)
+    {
+    x.at(i+row_offset, i+col_offset) = eT(arma_rng::randn<eT>());
+    }
+  }
+
+
+
+//! @}
-- 
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