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/glue_polyfit_meat.hpp   | 133 +++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/glue_polyfit_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/glue_polyfit_meat.hpp b/src/armadillo/include/armadillo_bits/glue_polyfit_meat.hpp
new file mode 100644
index 0000000..3969c75
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/glue_polyfit_meat.hpp
@@ -0,0 +1,133 @@
+// 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 glue_polyfit
+//! @{
+
+
+
+template<typename eT>
+inline
+bool
+glue_polyfit::apply_noalias(Mat<eT>& out, const Col<eT>& X, const Col<eT>& Y, const uword N)
+  {
+  arma_extra_debug_sigprint();
+  
+  // create Vandermonde matrix
+  
+  Mat<eT> V(X.n_elem, N+1, arma_nozeros_indicator());
+  
+  V.tail_cols(1).ones();
+  
+  for(uword i=1; i <= N; ++i)
+    {
+    const uword j = N-i;
+    
+    Col<eT> V_col_j  (V.colptr(j  ), V.n_rows, false, false);
+    Col<eT> V_col_jp1(V.colptr(j+1), V.n_rows, false, false);
+    
+    V_col_j = V_col_jp1 % X;
+    }
+  
+  Mat<eT> Q;
+  Mat<eT> R;
+  
+  const bool status1 = auxlib::qr_econ(Q, R, V);
+  
+  if(status1 == false)  { return false; }
+  
+  const bool status2 = auxlib::solve_trimat_fast(out, R, (Q.t() * Y), uword(0));
+  
+  if(status2 == false)  { return false; }
+  
+  return true;
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+bool
+glue_polyfit::apply_direct(Mat<typename T1::elem_type>& out, const Base<typename T1::elem_type,T1>& X_expr, const Base<typename T1::elem_type, T2>& Y_expr, const uword N)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const quasi_unwrap<T1> UX(X_expr.get_ref());
+  const quasi_unwrap<T2> UY(Y_expr.get_ref());
+  
+  const Mat<eT>& X = UX.M;
+  const Mat<eT>& Y = UY.M;
+  
+  arma_debug_check
+    (
+    ( ((X.is_vec() == false) && (X.is_empty() == false)) || ((Y.is_vec() == false) && (Y.is_empty() == false)) ),
+    "polyfit(): given object must be a vector"
+    );
+  
+  arma_debug_check( (X.n_elem != Y.n_elem), "polyfit(): given vectors must have the same number of elements" );
+  
+  if(X.n_elem == 0)
+    {
+    out.reset();
+    return true;
+    }
+  
+  arma_debug_check( (N >= X.n_elem), "polyfit(): N must be less than the number of elements in X" );
+  
+  const Col<eT> X_as_colvec( const_cast<eT*>(X.memptr()), X.n_elem, false, false);
+  const Col<eT> Y_as_colvec( const_cast<eT*>(Y.memptr()), Y.n_elem, false, false);
+  
+  bool status = false;
+  
+  if(UX.is_alias(out) || UY.is_alias(out))
+    {
+    Mat<eT> tmp;
+    status = glue_polyfit::apply_noalias(tmp, X_as_colvec, Y_as_colvec, N);
+    out.steal_mem(tmp);
+    }
+  else
+    {
+    status = glue_polyfit::apply_noalias(out, X_as_colvec, Y_as_colvec, N);
+    }
+  
+  return status;
+  }
+
+
+
+template<typename T1, typename T2>
+inline
+void
+glue_polyfit::apply(Mat<typename T1::elem_type>& out, const Glue<T1,T2,glue_polyfit>& expr)
+  {
+  arma_extra_debug_sigprint();
+  
+  const bool status = glue_polyfit::apply_direct(out, expr.A, expr.B, expr.aux_uword);
+  
+  if(status == false)
+    {
+    out.soft_reset();
+    arma_stop_runtime_error("polyfit(): failed");
+    }
+  }
+
+
+
+//! @}
-- 
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