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/op_nonzeros_meat.hpp    | 151 +++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_nonzeros_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_nonzeros_meat.hpp b/src/armadillo/include/armadillo_bits/op_nonzeros_meat.hpp
new file mode 100644
index 0000000..8cf32fa
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_nonzeros_meat.hpp
@@ -0,0 +1,151 @@
+// 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 op_nonzeros
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+op_nonzeros::apply_noalias(Mat<typename T1::elem_type>& out, const Proxy<T1>& P)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword N_max = P.get_n_elem();
+  
+  Mat<eT> tmp(N_max, 1, arma_nozeros_indicator());
+  
+  eT* tmp_mem = tmp.memptr();
+  
+  uword N_nz = 0;
+  
+  if(Proxy<T1>::use_at == false)
+    {
+    typename Proxy<T1>::ea_type Pea = P.get_ea();
+    
+    for(uword i=0; i<N_max; ++i)
+      {
+      const eT val = Pea[i];
+      
+      if(val != eT(0))  { tmp_mem[N_nz] = val; ++N_nz; }
+      }
+    }
+  else
+    {
+    const uword n_rows = P.get_n_rows();
+    const uword n_cols = P.get_n_cols();
+    
+    for(uword col=0; col < n_cols; ++col)
+    for(uword row=0; row < n_rows; ++row)
+      {
+      const eT val = P.at(row,col);
+      
+      if(val != eT(0))  { tmp_mem[N_nz] = val; ++N_nz; }
+      }
+    }
+  
+  out.steal_mem_col(tmp, N_nz);
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_nonzeros::apply(Mat<typename T1::elem_type>& out, const Op<T1, op_nonzeros>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const Proxy<T1> P(X.m);
+  
+  if(P.get_n_elem() == 0)  { out.set_size(0,1); return; }
+  
+  if(P.is_alias(out))
+    {
+    Mat<eT> out2;
+    
+    op_nonzeros::apply_noalias(out2, P);
+    
+    out.steal_mem(out2);
+    }
+  else
+    {
+    op_nonzeros::apply_noalias(out, P);
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_nonzeros_spmat::apply(Mat<typename T1::elem_type>& out, const SpToDOp<T1, op_nonzeros_spmat>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const SpProxy<T1> P(X.m);
+  
+  const uword N = P.get_n_nonzero();
+  
+  out.set_size(N,1);
+  
+  if(N == 0)  { return; }
+  
+  if(is_SpMat<typename SpProxy<T1>::stored_type>::value)
+    {
+    const unwrap_spmat<typename SpProxy<T1>::stored_type> U(P.Q);
+    
+    arrayops::copy(out.memptr(), U.M.values, N);
+    
+    return;
+    }
+  
+  if(is_SpSubview<typename SpProxy<T1>::stored_type>::value)
+    {
+    const SpSubview<eT>& sv = reinterpret_cast< const SpSubview<eT>& >(P.Q);
+    
+    if(sv.n_rows == sv.m.n_rows)
+      {
+      const SpMat<eT>& m   = sv.m;
+      const uword      col = sv.aux_col1;
+      
+      arrayops::copy(out.memptr(), &(m.values[ m.col_ptrs[col] ]), N);
+      
+      return;
+      }
+    }
+  
+  eT* out_mem = out.memptr();
+  
+  typename SpProxy<T1>::const_iterator_type it = P.begin();
+  
+  for(uword i=0; i<N; ++i)  { out_mem[i] = (*it); ++it; }
+  }
+
+
+
+//! @}
-- 
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