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diff --git a/src/armadillo/include/armadillo_bits/fn_lu.hpp b/src/armadillo/include/armadillo_bits/fn_lu.hpp
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+// 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_lu
+//! @{
+
+
+
+//! immediate lower upper decomposition, permutation info is embedded into L (similar to Matlab/Octave)
+template<typename T1>
+inline
+bool
+lu
+  (
+         Mat<typename T1::elem_type>&    L,
+         Mat<typename T1::elem_type>&    U,
+  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( (&L == &U), "lu(): L and U are the same object" );
+  
+  const bool status = auxlib::lu(L, U, X);
+  
+  if(status == false)
+    {
+    L.soft_reset();
+    U.soft_reset();
+    arma_debug_warn_level(3, "lu(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! immediate lower upper decomposition, also providing the permutation matrix
+template<typename T1>
+inline
+bool
+lu
+  (
+         Mat<typename T1::elem_type>&    L,
+         Mat<typename T1::elem_type>&    U, 
+         Mat<typename T1::elem_type>&    P,
+  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( ( (&L == &U) || (&L == &P) || (&U == &P) ), "lu(): two or more output objects are the same object" );
+  
+  const bool status = auxlib::lu(L, U, P, X);
+  
+  if(status == false)
+    {
+    L.soft_reset();
+    U.soft_reset();
+    P.soft_reset();
+    arma_debug_warn_level(3, "lu(): decomposition failed");
+    }
+  
+  return status;
+  }
+
+
+
+//! @}