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_rank_meat.hpp        | 184 +++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/op_rank_meat.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/op_rank_meat.hpp b/src/armadillo/include/armadillo_bits/op_rank_meat.hpp
new file mode 100644
index 0000000..ef00dd3
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/op_rank_meat.hpp
@@ -0,0 +1,184 @@
+// 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_rank
+//! @{
+
+
+
+template<typename T1>
+inline
+bool
+op_rank::apply(uword& out, const Base<typename T1::elem_type,T1>& expr, const typename T1::pod_type tol)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  Mat<eT> A(expr.get_ref());
+  
+  if(A.is_empty())  { out = uword(0); return true; }
+  
+  if(is_op_diagmat<T1>::value || A.is_diagmat())
+    {
+    arma_extra_debug_print("op_rank::apply(): detected diagonal matrix");
+    
+    return op_rank::apply_diag(out, A, tol);
+    }
+  
+  bool do_sym = false;
+  
+  if((arma_config::optimise_sym) && (auxlib::crippled_lapack(A) == false) && (A.n_rows >= (is_cx<eT>::yes ? uword(64) : uword(128))))
+    {
+    bool is_approx_sym   = false;
+    bool is_approx_sympd = false;
+    
+    sym_helper::analyse_matrix(is_approx_sym, is_approx_sympd, A);
+    
+    do_sym = (is_cx<eT>::no) ? (is_approx_sym) : (is_approx_sym && is_approx_sympd);
+    }
+  
+  if(do_sym)
+    {
+    arma_extra_debug_print("op_rank::apply(): symmetric/hermitian optimisation");
+    
+    return op_rank::apply_sym(out, A, tol);
+    }
+  
+  return op_rank::apply_gen(out, A, tol);
+  }
+
+
+
+template<typename eT>
+inline
+bool
+op_rank::apply_diag(uword& out, Mat<eT>& A, typename get_pod_type<eT>::result tol)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename get_pod_type<eT>::result T;
+  
+  const uword N = (std::min)(A.n_rows, A.n_cols);
+  
+  podarray<T> diag_abs_vals(N);
+  
+  T max_abs_Aii = T(0);
+  
+  for(uword i=0; i<N; ++i)
+    {
+    const eT     Aii = A.at(i,i);
+    const  T abs_Aii = std::abs(Aii);
+    
+    if(arma_isnan(Aii))  { out = uword(0); return false; }
+    
+    diag_abs_vals[i] = abs_Aii;
+    
+    max_abs_Aii = (abs_Aii > max_abs_Aii) ? abs_Aii : max_abs_Aii;
+    }
+  
+  // set tolerance to default if it hasn't been specified
+  if(tol == T(0))  { tol = (std::max)(A.n_rows, A.n_cols) * max_abs_Aii * std::numeric_limits<T>::epsilon(); }
+  
+  uword count = 0;
+  
+  for(uword i=0; i<N; ++i)  { count += (diag_abs_vals[i] > tol) ? uword(1) : uword(0); }
+  
+  out = count;
+  
+  return true;
+  }
+
+
+
+template<typename eT>
+inline
+bool
+op_rank::apply_sym(uword& out, Mat<eT>& A, typename get_pod_type<eT>::result tol)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename get_pod_type<eT>::result T;
+  
+  if(A.is_square() == false)  { out = uword(0); return false; }
+  
+  Col<T> v;
+  
+  const bool status = auxlib::eig_sym(v, A);
+  
+  if(status == false)  { out = uword(0); return false; }
+  
+  const uword v_n_elem = v.n_elem;
+        T*    v_mem    = v.memptr();
+  
+  if(v_n_elem == 0)  { out = uword(0); return true; }
+  
+  T max_abs_v = T(0);
+  
+  for(uword i=0; i < v_n_elem; ++i)  { const T val = std::abs(v_mem[i]); v_mem[i] = val; if(val > max_abs_v) { max_abs_v = val; } }
+  
+  // set tolerance to default if it hasn't been specified
+  if(tol == T(0))  { tol = (std::max)(A.n_rows, A.n_cols) * max_abs_v * std::numeric_limits<T>::epsilon(); }
+  
+  uword count = 0;
+  
+  for(uword i=0; i < v_n_elem; ++i)  { count += (v_mem[i] > tol) ? uword(1) : uword(0); }
+  
+  out = count;
+  
+  return true;
+  }
+
+
+
+template<typename eT>
+inline
+bool
+op_rank::apply_gen(uword& out, Mat<eT>& A, typename get_pod_type<eT>::result tol)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename get_pod_type<eT>::result T;
+  
+  Col<T> s;
+  
+  const bool status = auxlib::svd_dc(s, A);
+  
+  if(status == false)  { out = uword(0); return false; }
+  
+  const uword s_n_elem = s.n_elem;
+  const T*    s_mem    = s.memptr();
+  
+  if(s_n_elem == 0)  { out = uword(0); return true; }
+  
+  // set tolerance to default if it hasn't been specified
+  if(tol == T(0))  { tol = (std::max)(A.n_rows, A.n_cols) * s_mem[0] * std::numeric_limits<T>::epsilon(); }
+  
+  uword count = 0;
+  
+  for(uword i=0; i < s_n_elem; ++i)  { count += (s_mem[i] > tol) ? uword(1) : uword(0); }
+  
+  out = count;
+  
+  return true;
+  }
+
+
+
+//! @}
-- 
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