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_rcond_meat.hpp       | 113 +++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_rcond_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_rcond_meat.hpp b/src/armadillo/include/armadillo_bits/op_rcond_meat.hpp
new file mode 100644
index 0000000..48123bd
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_rcond_meat.hpp
@@ -0,0 +1,113 @@
+// 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_rcond
+//! @{
+
+
+
+template<typename T1>
+inline
+typename T1::pod_type
+op_rcond::apply(const Base<typename T1::elem_type, T1>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  typedef typename T1::pod_type   T;
+  
+  if(strip_trimat<T1>::do_trimat)
+    {
+    const strip_trimat<T1> S(X.get_ref());
+    
+    const quasi_unwrap<typename strip_trimat<T1>::stored_type> U(S.M);
+    
+    arma_debug_check( (U.M.is_square() == false), "rcond(): matrix must be square sized" );
+    
+    const uword layout = (S.do_triu) ? uword(0) : uword(1);
+    
+    return auxlib::rcond_trimat(U.M, layout);
+    }
+  
+  Mat<eT> A = X.get_ref();
+  
+  arma_debug_check( (A.is_square() == false), "rcond(): matrix must be square sized" );
+  
+  if(A.is_empty()) { return Datum<T>::inf; }
+  
+  if(is_op_diagmat<T1>::value || A.is_diagmat())
+    {
+    arma_extra_debug_print("op_rcond::apply(): detected diagonal matrix");
+    
+    const eT*   colmem = A.memptr();
+    const uword N      = A.n_rows;
+    
+    T abs_min = Datum<T>::inf;
+    T abs_max = T(0);
+    
+    for(uword i=0; i<N; ++i)
+      {
+      const T abs_val = std::abs(colmem[i]);
+      
+      abs_min = (abs_val < abs_min) ? abs_val : abs_min;
+      abs_max = (abs_val > abs_max) ? abs_val : abs_max;
+      
+      colmem += N;
+      }
+    
+    if((abs_min == T(0)) || (abs_max == T(0)))  { return T(0); }
+    
+    return T(abs_min / abs_max);
+    }
+  
+  const bool is_triu =                     trimat_helper::is_triu(A);
+  const bool is_tril = (is_triu) ? false : trimat_helper::is_tril(A);
+  
+  if(is_triu || is_tril)
+    {
+    const uword layout = (is_triu) ? uword(0) : uword(1);
+    
+    return auxlib::rcond_trimat(A, layout);
+    }
+  
+  const bool try_sympd = arma_config::optimise_sym && (auxlib::crippled_lapack(A) ? false : sym_helper::guess_sympd(A));
+  
+  if(try_sympd)
+    {
+    arma_extra_debug_print("op_rcond::apply(): attempting sympd optimisation");
+    
+    bool calc_ok = false;
+    
+    const T out_val = auxlib::rcond_sympd(A, calc_ok);
+    
+    if(calc_ok)  { return out_val; }
+    
+    arma_extra_debug_print("op_rcond::apply(): sympd optimisation failed");
+    
+    // auxlib::rcond_sympd() may have failed because A isn't really sympd
+    // restore A, as auxlib::rcond_sympd() may have destroyed it
+    A = X.get_ref();
+    // fallthrough to the next return statement
+    }
+  
+  return auxlib::rcond(A);
+  }
+
+
+
+//! @}
-- 
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