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

---
 src/armadillo/include/armadillo_bits/fn_qr.hpp | 145 +++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/fn_qr.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/fn_qr.hpp b/src/armadillo/include/armadillo_bits/fn_qr.hpp
new file mode 100644
index 0000000..3d49a1b
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/fn_qr.hpp
@@ -0,0 +1,145 @@
+// 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 fn_qr
+//! @{
+
+
+
+//! QR decomposition
+template<typename T1>
+inline
+bool
+qr
+  (
+         Mat<typename T1::elem_type>&    Q,
+         Mat<typename T1::elem_type>&    R,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  arma_debug_check( (&Q == &R), "qr(): Q and R are the same object" );
+  
+  const bool status = auxlib::qr(Q, R, X);
+  
+  if(status == false)
+    {
+    Q.soft_reset();
+    R.soft_reset();
+    arma_debug_warn_level(3, "qr(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! economical QR decomposition
+template<typename T1>
+inline
+bool
+qr_econ
+  (
+         Mat<typename T1::elem_type>&    Q,
+         Mat<typename T1::elem_type>&    R,
+  const Base<typename T1::elem_type,T1>& X,
+  const typename arma_blas_type_only<typename T1::elem_type>::result* junk = nullptr
+  )
+  {
+  arma_extra_debug_sigprint();
+  arma_ignore(junk);
+  
+  arma_debug_check( (&Q == &R), "qr_econ(): Q and R are the same object" );
+  
+  const bool status = auxlib::qr_econ(Q, R, X);
+  
+  if(status == false)
+    {
+    Q.soft_reset();
+    R.soft_reset();
+    arma_debug_warn_level(3, "qr_econ(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! QR decomposition with pivoting
+template<typename T1>
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+qr
+  (
+         Mat<typename T1::elem_type>&    Q,
+         Mat<typename T1::elem_type>&    R,
+         Mat<uword>&                     P,
+  const Base<typename T1::elem_type,T1>& X,
+  const char*                            P_mode = "matrix"
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  arma_debug_check( (&Q == &R), "qr(): Q and R are the same object" );
+  
+  const char sig = (P_mode != nullptr) ? P_mode[0] : char(0);
+  
+  arma_debug_check( ((sig != 'm') && (sig != 'v')), "qr(): argument 'P_mode' must be \"vector\" or \"matrix\"" );
+  
+  bool status = false;
+  
+  if(sig == 'v')
+    {
+    status = auxlib::qr_pivot(Q, R, P, X);
+    }
+  else
+  if(sig == 'm')
+    {
+    Mat<uword> P_vec;
+    
+    status = auxlib::qr_pivot(Q, R, P_vec, X);
+    
+    if(status)
+      {
+      // construct P
+      
+      const uword N = P_vec.n_rows;
+      
+      P.zeros(N,N);
+      
+      for(uword row=0; row < N; ++row)  { P.at(P_vec[row], row) = uword(1); }
+      }
+    }
+  
+  if(status == false)
+    {
+    Q.soft_reset();
+    R.soft_reset();
+    P.soft_reset();
+    arma_debug_warn_level(3, "qr(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! @}
-- 
cgit v1.2.1