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_prod_meat.hpp        | 217 +++++++++++++++++++++
 1 file changed, 217 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_prod_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_prod_meat.hpp b/src/armadillo/include/armadillo_bits/op_prod_meat.hpp
new file mode 100644
index 0000000..c1b9577
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_prod_meat.hpp
@@ -0,0 +1,217 @@
+// 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_prod
+//! @{
+
+
+template<typename eT>
+inline
+void
+op_prod::apply_noalias(Mat<eT>& out, const Mat<eT>& X, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword X_n_rows = X.n_rows;
+  const uword X_n_cols = X.n_cols;
+    
+  if(dim == 0)  // traverse across rows (ie. find the product in each column)
+    {
+    out.set_size(1, X_n_cols);
+    
+    eT* out_mem = out.memptr();
+    
+    for(uword col=0; col < X_n_cols; ++col)
+      {
+      out_mem[col] = arrayops::product(X.colptr(col), X_n_rows);
+      }
+    }
+  else  // traverse across columns (ie. find the product in each row)
+    {
+    out.ones(X_n_rows, 1);
+    
+    eT* out_mem = out.memptr();
+    
+    for(uword col=0; col < X_n_cols; ++col)
+      {
+      const eT* X_col_mem = X.colptr(col);
+      
+      for(uword row=0; row < X_n_rows; ++row)
+        {
+        out_mem[row] *= X_col_mem[row];
+        }
+      }
+    }
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_prod::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_prod>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword dim = in.aux_uword_a;
+  
+  arma_debug_check( (dim > 1), "prod(): parameter 'dim' must be 0 or 1" );
+  
+  const quasi_unwrap<T1> U(in.m);
+  
+  if(U.is_alias(out))
+    {
+    Mat<eT> tmp;
+    
+    op_prod::apply_noalias(tmp, U.M, dim);
+    
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    op_prod::apply_noalias(out, U.M, dim);
+    }
+  }
+
+
+
+template<typename eT>
+inline
+eT
+op_prod::prod(const subview<eT>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  eT val = eT(1);
+  
+  const uword X_n_rows = X.n_rows;
+  const uword X_n_cols = X.n_cols;
+  
+  if(X_n_rows == 1)
+    {
+    const Mat<eT>& A = X.m;
+  
+    const uword start_row = X.aux_row1;
+    const uword start_col = X.aux_col1;
+    
+    const uword end_col_p1 = start_col + X_n_cols;
+    
+    uword i,j;
+    for(i=start_col, j=start_col+1; j < end_col_p1; i+=2, j+=2)
+      {
+      val *= A.at(start_row, i);
+      val *= A.at(start_row, j);
+      }
+    
+    if(i < end_col_p1)
+      {
+      val *= A.at(start_row, i);
+      }
+    }
+  else
+    {
+    for(uword col=0; col < X_n_cols; ++col)
+      {
+      val *= arrayops::product( X.colptr(col), X_n_rows );
+      }
+    }
+  
+  return val;
+  }
+
+
+
+template<typename T1>
+inline
+typename T1::elem_type
+op_prod::prod(const Base<typename T1::elem_type,T1>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const Proxy<T1> P(X.get_ref());
+  
+  eT val = eT(1);
+  
+  if(Proxy<T1>::use_at == false)
+    {
+    typedef typename Proxy<T1>::ea_type ea_type;
+    
+    const ea_type A = P.get_ea();
+    
+    const uword n_elem = P.get_n_elem();
+    
+    uword i,j;
+    for(i=0, j=1; j < n_elem; i+=2, j+=2)
+      {
+      val *= A[i];
+      val *= A[j];
+      }
+    
+    if(i < n_elem)
+      {
+      val *= A[i];
+      }
+    }
+  else
+    {
+    const uword n_rows = P.get_n_rows();
+    const uword n_cols = P.get_n_cols();
+    
+    if(n_rows == 1)
+      {
+      uword i,j;
+      for(i=0, j=1; j < n_cols; i+=2, j+=2)
+        {
+        val *= P.at(0,i);
+        val *= P.at(0,j);
+        }
+      
+      if(i < n_cols)
+        {
+        val *= P.at(0,i);
+        }
+      }
+    else
+      {
+      for(uword col=0; col < n_cols; ++col)
+        {
+        uword i,j;
+        for(i=0, j=1; j < n_rows; i+=2, j+=2)
+          {
+          val *= P.at(i,col);
+          val *= P.at(j,col);
+          }
+        
+        if(i < n_rows)
+          {
+          val *= P.at(i,col);
+          }
+        }
+      }
+    }
+  
+  return val;
+  }
+
+
+
+//! @}
-- 
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