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/fn_eig_sym.hpp          | 161 +++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/fn_eig_sym.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/fn_eig_sym.hpp b/src/armadillo/include/armadillo_bits/fn_eig_sym.hpp
new file mode 100644
index 0000000..12043b6
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/fn_eig_sym.hpp
@@ -0,0 +1,161 @@
+// 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_eig_sym
+//! @{
+
+
+//! Eigenvalues of real/complex symmetric/hermitian matrix X
+template<typename T1>
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+eig_sym
+  (
+         Col<typename T1::pod_type>&     eigval,
+  const Base<typename T1::elem_type,T1>& X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  Mat<eT> A(X.get_ref());
+  
+  const bool status = auxlib::eig_sym(eigval, A);
+  
+  if(status == false)
+    {
+    eigval.soft_reset();
+    arma_debug_warn_level(3, "eig_sym(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! Eigenvalues of real/complex symmetric/hermitian matrix X
+template<typename T1>
+arma_warn_unused
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, Col<typename T1::pod_type> >::result
+eig_sym
+  (
+  const Base<typename T1::elem_type,T1>& X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  typedef typename T1::pod_type   T;
+  
+  Col< T> eigval;
+  Mat<eT> A(X.get_ref());
+  
+  const bool status = auxlib::eig_sym(eigval, A);
+
+  if(status == false)
+    {
+    eigval.reset();
+    arma_stop_runtime_error("eig_sym(): decomposition failed");
+    }
+  
+  return eigval;
+  }
+
+
+
+//! internal helper function
+template<typename eT>
+inline
+bool
+eig_sym_helper
+  (
+        Col<typename get_pod_type<eT>::result>& eigval,
+        Mat<eT>&                                eigvec,
+  const Mat<eT>&                                X,
+  const char                                    method_sig,
+  const char*                                   caller_sig
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  if((arma_config::debug) && (auxlib::rudimentary_sym_check(X) == false))
+    {
+    if(is_cx<eT>::no )  { arma_debug_warn_level(1, caller_sig, ": given matrix is not symmetric"); }
+    if(is_cx<eT>::yes)  { arma_debug_warn_level(1, caller_sig, ": given matrix is not hermitian"); }
+    }
+  
+  bool status = false;
+  
+  if(method_sig == 'd') { status = auxlib::eig_sym_dc(eigval, eigvec, X); }
+  
+  if(status == false)   { status = auxlib::eig_sym(eigval, eigvec, X);    }
+  
+  return status;
+  }
+
+
+
+//! Eigenvalues and eigenvectors of real/complex symmetric/hermitian matrix X
+template<typename T1> 
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+eig_sym
+  (
+         Col<typename T1::pod_type>&     eigval,
+         Mat<typename T1::elem_type>&    eigvec,
+  const Base<typename T1::elem_type,T1>& expr,
+  const char* method =                   "dc"
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const char sig = (method != nullptr) ? method[0] : char(0);
+  
+  arma_debug_check( ((sig != 's') && (sig != 'd')),         "eig_sym(): unknown method specified"                             );
+  arma_debug_check( void_ptr(&eigval) == void_ptr(&eigvec), "eig_sym(): parameter 'eigval' is an alias of parameter 'eigvec'" );
+  
+  const quasi_unwrap<T1> U(expr.get_ref());
+  
+  const bool is_alias = U.is_alias(eigvec);
+  
+  Mat<eT>  eigvec_tmp;
+  Mat<eT>& eigvec_out = (is_alias == false) ? eigvec : eigvec_tmp;
+  
+  const bool status = eig_sym_helper(eigval, eigvec_out, U.M, sig, "eig_sym()");
+  
+  if(status == false)
+    {
+    eigval.soft_reset();
+    eigvec.soft_reset();
+    arma_debug_warn_level(3, "eig_sym(): decomposition failed");
+    }
+  else
+    {
+    if(is_alias)  { eigvec.steal_mem(eigvec_tmp); }
+    }
+  
+  return status;
+  }
+
+
+
+//! @}
-- 
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