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_inv.hpp | 138 ++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 src/armadillo/include/armadillo_bits/fn_inv.hpp

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

diff --git a/src/armadillo/include/armadillo_bits/fn_inv.hpp b/src/armadillo/include/armadillo_bits/fn_inv.hpp
new file mode 100644
index 0000000..65589f7
--- /dev/null
+++ b/src/armadillo/include/armadillo_bits/fn_inv.hpp
@@ -0,0 +1,138 @@
+// 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_inv
+//! @{
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, const Op<T1, op_inv_gen_default> >::result
+inv
+  (
+  const Base<typename T1::elem_type,T1>& X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_inv_gen_default>(X.get_ref());
+  }
+
+
+
+template<typename T1>
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+inv
+  (
+         Mat<typename T1::elem_type>&    out,
+  const Base<typename T1::elem_type,T1>& X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  const bool status = op_inv_gen_default::apply_direct(out, X.get_ref(), "inv()");
+  
+  if(status == false)
+    {
+    out.soft_reset();
+    arma_debug_warn_level(3, "inv(): matrix is singular");
+    }
+  
+  return status;
+  }
+
+
+
+template<typename T1>
+arma_warn_unused
+arma_inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, const Op<T1, op_inv_gen_full> >::result
+inv
+  (
+  const Base<typename T1::elem_type,T1>& X,
+  const inv_opts::opts&                  opts
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return Op<T1, op_inv_gen_full>(X.get_ref(), opts.flags, uword(0));
+  }
+
+
+
+template<typename T1>
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+inv
+  (
+         Mat<typename T1::elem_type>&    out,
+  const Base<typename T1::elem_type,T1>& X,
+  const inv_opts::opts&                  opts
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  const bool status = op_inv_gen_full::apply_direct(out, X.get_ref(), "inv()", opts.flags);
+  
+  if(status == false)
+    {
+    out.soft_reset();
+    arma_debug_warn_level(3, "inv(): matrix is singular");
+    }
+  
+  return status;
+  }
+
+
+
+template<typename T1>
+inline
+typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, bool >::result
+inv
+  (
+         Mat<typename T1::elem_type>&    out_inv,
+             typename T1::pod_type&      out_rcond,
+  const Base<typename T1::elem_type,T1>& X
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::pod_type T;
+  
+  op_inv_gen_state<T> inv_state;
+  
+  const bool status = op_inv_gen_rcond::apply_direct(out_inv, inv_state, X.get_ref());
+  
+  out_rcond = inv_state.rcond;
+  
+  if(status == false)
+    {
+    out_rcond = T(0);
+    out_inv.soft_reset();
+    arma_debug_warn_level(3, "inv(): matrix is singular");
+    }
+  
+  return status;
+  }
+
+
+
+//! @}
-- 
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