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_shuffle_meat.hpp     | 234 +++++++++++++++++++++
 1 file changed, 234 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_shuffle_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_shuffle_meat.hpp b/src/armadillo/include/armadillo_bits/op_shuffle_meat.hpp
new file mode 100644
index 0000000..ecfc2f6
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_shuffle_meat.hpp
@@ -0,0 +1,234 @@
+// 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_shuffle
+//! @{
+
+
+
+template<typename eT>
+inline
+void
+op_shuffle::apply_direct(Mat<eT>& out, const Mat<eT>& X, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  if(X.is_empty()) { out.copy_size(X); return; }
+  
+  const uword N = (dim == 0) ? X.n_rows : X.n_cols;
+  
+  // see op_sort_index_bones.hpp for the definition of arma_sort_index_packet
+  // and the associated comparison functor
+  
+  typedef arma_sort_index_packet<int> packet;
+  
+  std::vector<packet> packet_vec(N);
+  
+  for(uword i=0; i<N; ++i)
+    {
+    packet_vec[i].val   = int(arma_rng::randi<int>());
+    packet_vec[i].index = i;
+    }
+  
+  arma_sort_index_helper_ascend<int> comparator;
+  
+  std::sort( packet_vec.begin(), packet_vec.end(), comparator );
+  
+  const bool is_alias = (&out == &X);
+  
+  if(X.is_vec() == false)
+    {
+    if(is_alias == false)
+      {
+      arma_extra_debug_print("op_shuffle::apply(): matrix");
+      
+      out.copy_size(X);
+      
+      if(dim == 0)
+        {
+        for(uword i=0; i<N; ++i) { out.row(i) = X.row(packet_vec[i].index); }
+        }
+      else
+        {
+        for(uword i=0; i<N; ++i) { out.col(i) = X.col(packet_vec[i].index); }
+        }
+      }
+    else  // in-place shuffle
+      {
+      arma_extra_debug_print("op_shuffle::apply(): in-place matrix");
+      
+      // reuse the val member variable of packet_vec
+      // to indicate whether a particular row or column
+      // has already been shuffled
+      
+      for(uword i=0; i<N; ++i)
+        {
+        packet_vec[i].val = 0;
+        }
+        
+      if(dim == 0)
+        {
+        for(uword i=0; i<N; ++i)
+          {
+          if(packet_vec[i].val == 0)
+            {
+            const uword j = packet_vec[i].index;
+            
+            out.swap_rows(i, j);
+            
+            packet_vec[j].val = 1;
+            }
+          }
+        }
+      else
+        {
+        for(uword i=0; i<N; ++i)
+          {
+          if(packet_vec[i].val == 0)
+            {
+            const uword j = packet_vec[i].index;
+            
+            out.swap_cols(i, j);
+            
+            packet_vec[j].val = 1;
+            }
+          }
+        }
+      }
+    }
+  else  // we're dealing with a vector
+    {
+    if(is_alias == false)
+      {
+      arma_extra_debug_print("op_shuffle::apply(): vector");
+      
+      out.copy_size(X);
+      
+      if(dim == 0)
+        {
+        if(X.n_rows > 1)  // ie. column vector
+          {
+          for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
+          }
+        else
+          {
+          out = X;
+          }
+        }
+      else
+        {
+        if(X.n_cols > 1)  // ie. row vector
+          {
+          for(uword i=0; i<N; ++i) { out[i] = X[ packet_vec[i].index ]; }
+          }
+        else
+          {
+          out = X;
+          }
+        }
+      }
+    else  // in-place shuffle
+      {
+      arma_extra_debug_print("op_shuffle::apply(): in-place vector");
+      
+      // reuse the val member variable of packet_vec
+      // to indicate whether a particular row or column
+      // has already been shuffled
+      
+      for(uword i=0; i<N; ++i)
+        {
+        packet_vec[i].val = 0;
+        }
+        
+      if(dim == 0)
+        {
+        if(X.n_rows > 1)  // ie. column vector
+          {
+          for(uword i=0; i<N; ++i)
+            {
+            if(packet_vec[i].val == 0)
+              {
+              const uword j = packet_vec[i].index;
+              
+              std::swap(out[i], out[j]);
+              
+              packet_vec[j].val = 1;
+              }
+            }
+          }
+        }
+      else
+        {
+        if(X.n_cols > 1)  // ie. row vector
+          {
+          for(uword i=0; i<N; ++i)
+            {
+            if(packet_vec[i].val == 0)
+              {
+              const uword j = packet_vec[i].index;
+              
+              std::swap(out[i], out[j]);
+              
+              packet_vec[j].val = 1;
+              }
+            }
+          }
+        }
+      }
+    }
+  
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_shuffle::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  const unwrap<T1> U(in.m);
+  
+  const uword dim = in.aux_uword_a;
+  
+  arma_debug_check( (dim > 1), "shuffle(): parameter 'dim' must be 0 or 1" );
+  
+  op_shuffle::apply_direct(out, U.M, dim);
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_shuffle_vec::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle_vec>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  const unwrap<T1> U(in.m);
+  
+  const uword dim = (T1::is_xvec) ? uword(U.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
+  
+  op_shuffle::apply_direct(out, U.M, dim);
+  }
+
+
+
+//! @}
-- 
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