1 files changed, 125 insertions, 0 deletions
diff --git a/src/armadillo/include/armadillo_bits/op_hist_meat.hpp b/src/armadillo/include/armadillo_bits/op_hist_meat.hpp
new file mode 100644
index 0000000..04c5ed8
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+++ b/src/armadillo/include/armadillo_bits/op_hist_meat.hpp
@@ -0,0 +1,125 @@
+// 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_hist
+//! @{
+
+
+
+template<typename eT>
+inline
+void
+op_hist::apply_noalias(Mat<uword>& out, const Mat<eT>& A, const uword n_bins, const uword dim)
+  {
+  arma_extra_debug_sigprint();
+  
+  arma_debug_check( ((A.is_vec() == false) && (A.is_empty() == false)), "hist(): only vectors are supported when automatically determining bin centers" );
+  
+  if(n_bins == 0)  { out.reset(); return; }
+  
+        uword A_n_elem = A.n_elem;
+  const eT*   A_mem    = A.memptr();
+  
+  eT min_val = priv::most_pos<eT>();
+  eT max_val = priv::most_neg<eT>();
+  
+  uword i,j;
+  for(i=0, j=1; j < A_n_elem; i+=2, j+=2)
+    {
+    const eT val_i = A_mem[i];
+    const eT val_j = A_mem[j];
+    
+    if(min_val > val_i) { min_val = val_i; }
+    if(min_val > val_j) { min_val = val_j; }
+      
+    if(max_val < val_i) { max_val = val_i; }
+    if(max_val < val_j) { max_val = val_j; }
+    }
+  
+  if(i < A_n_elem)
+    {
+    const eT val_i = A_mem[i];
+    
+    if(min_val > val_i) { min_val = val_i; }
+    if(max_val < val_i) { max_val = val_i; }
+    }
+  
+  if(min_val == max_val)
+    {
+    min_val -= (n_bins/2);
+    max_val += (n_bins/2);
+    }
+  
+  if(arma_isfinite(min_val) == false) { min_val = priv::most_neg<eT>(); }
+  if(arma_isfinite(max_val) == false) { max_val = priv::most_pos<eT>(); }
+  
+  Col<eT> c(n_bins, arma_nozeros_indicator());
+  eT* c_mem = c.memptr();
+  
+  for(uword ii=0; ii < n_bins; ++ii)
+    {
+    c_mem[ii] = (0.5 + ii) / double(n_bins);
+    }
+  
+  c = ((max_val - min_val) * c) + min_val;
+  
+  glue_hist::apply_noalias(out, A, c, dim);
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_hist::apply(Mat<uword>& out, const mtOp<uword, T1, op_hist>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  const uword n_bins = X.aux_uword_a;
+  
+  const quasi_unwrap<T1> U(X.m);
+  
+  const uword dim = (T1::is_xvec) ? uword(U.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
+  
+  if(is_non_integral<typename T1::elem_type>::value)
+    {
+    if(U.is_alias(out))
+      {
+      Mat<uword> tmp;
+      
+      op_hist::apply_noalias(tmp, U.M, n_bins, dim);
+      
+      out.steal_mem(tmp);
+      }
+    else
+      {
+      op_hist::apply_noalias(out, U.M, n_bins, dim);
+      }
+    }
+  else
+    {
+    Mat<double> converted = conv_to< Mat<double> >::from(U.M);
+    
+    op_hist::apply_noalias(out, converted, n_bins, dim);
+    }
+  }
+
+
+
+//! @}