comparison armadillo-3.900.4/include/armadillo_bits/op_shuffle_meat.hpp @ 49:1ec0e2823891

Switch to using subrepo copies of qm-dsp, nnls-chroma, vamp-plugin-sdk; update Armadillo version; assume build without external BLAS/LAPACK

+// Copyright (C) 2009-2012 NICTA (www.nicta.com.au)
+// Copyright (C) 2009-2012 Conrad Sanderson
+// Copyright (C) 2009-2010 Dimitrios Bouzas
+// 
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+
+//! \addtogroup op_shuffle
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+op_shuffle::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_shuffle>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const unwrap<T1>   tmp(in.m);
+  const Mat<eT>& X = tmp.M;
+  
+  if(X.is_empty()) { out.copy_size(X); return; }
+  
+  const uword dim = in.aux_uword_a;
+  const uword N   = (dim == 0) ? X.n_rows : X.n_cols;
+  
+  // see "fn_sort_index.hpp" for the definition of "arma_sort_index_packet"
+  // and the associated comparison functor
+  std::vector< arma_sort_index_packet<int,uword> > packet_vec(N);
+  
+  for(uword i=0; i<N; ++i)
+    {
+    packet_vec[i].val   = std::rand();
+    packet_vec[i].index = i;
+    }
+  
+  arma_sort_index_helper_ascend 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)  // i.e. 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)  // i.e. 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)  // i.e. 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)  // i.e. 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;
+              }
+            }
+          }
+        }
+      }
+    }
+  
+  }
+
+
+//! @}