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_cov_meat.hpp         | 104 +++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_cov_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_cov_meat.hpp b/src/armadillo/include/armadillo_bits/op_cov_meat.hpp
new file mode 100644
index 0000000..30944b7
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_cov_meat.hpp
@@ -0,0 +1,104 @@
+// 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_cov
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+op_cov::apply(Mat<typename T1::elem_type>& out, const Op<T1,op_cov>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword norm_type = in.aux_uword_a;
+  
+  const unwrap<T1>   U(in.m);
+  const Mat<eT>& A = U.M;
+  
+  if(A.n_elem == 0)
+    {
+    out.reset();
+    return;
+    }
+  
+  const Mat<eT>& AA = (A.n_rows == 1) 
+                      ? Mat<eT>(const_cast<eT*>(A.memptr()), A.n_cols, A.n_rows, false, false)
+                      : Mat<eT>(const_cast<eT*>(A.memptr()), A.n_rows, A.n_cols, false, false);
+  
+  const uword N        = AA.n_rows;
+  const eT    norm_val = (norm_type == 0) ? ( (N > 1) ? eT(N-1) : eT(1) ) : eT(N);
+  
+  const Mat<eT> tmp = AA.each_row() - mean(AA,0);
+  
+  out = tmp.t() * tmp;
+  out /= norm_val;
+  }
+
+
+
+template<typename T1>
+inline
+void
+op_cov::apply(Mat<typename T1::elem_type>& out, const Op< Op<T1,op_htrans>, op_cov>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword norm_type = in.aux_uword_a;
+  
+  if(is_cx<eT>::yes)
+    {
+    const Mat<eT> tmp = in.m;  // force the evaluation of Op<T1,op_htrans>
+    
+    out = cov(tmp, norm_type);
+    }
+  else
+    {
+    const unwrap<T1>   U(in.m.m);
+    const Mat<eT>& A = U.M;
+    
+    if(A.n_elem == 0)
+      {
+      out.reset();
+      return;
+      }
+    
+    const Mat<eT>& AA = (A.n_cols == 1)
+                        ? Mat<eT>(const_cast<eT*>(A.memptr()), A.n_cols, A.n_rows, false, false)
+                        : Mat<eT>(const_cast<eT*>(A.memptr()), A.n_rows, A.n_cols, false, false);
+    
+    const uword N        = AA.n_cols;
+    const eT    norm_val = (norm_type == 0) ? ( (N > 1) ? eT(N-1) : eT(1) ) : eT(N);
+    
+    const Mat<eT> tmp = AA.each_col() - mean(AA,1);
+    
+    out = tmp * tmp.t();
+    out /= norm_val;
+    }
+  }
+
+
+
+//! @}
-- 
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