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diff --git a/src/armadillo/include/armadillo_bits/operator_schur.hpp b/src/armadillo/include/armadillo_bits/operator_schur.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 operator_schur
+//! @{
+
+
+// operator %, which we define it to do a schur product (element-wise multiplication)
+
+
+//! element-wise multiplication of user-accessible Armadillo objects with same element type
+template<typename T1, typename T2>
+arma_inline
+typename
+enable_if2
+  <
+  is_arma_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value,
+  const eGlue<T1, T2, eglue_schur>
+  >::result
+operator%
+  (
+  const T1& X,
+  const T2& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return eGlue<T1, T2, eglue_schur>(X, Y);
+  }
+
+
+
+//! element-wise multiplication of user-accessible Armadillo objects with different element types
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_type<T2>::value && (is_same_type<typename T1::elem_type, typename T2::elem_type>::no)),
+  const mtGlue<typename promote_type<typename T1::elem_type, typename T2::elem_type>::result, T1, T2, glue_mixed_schur>
+  >::result
+operator%
+  (
+  const T1& X,
+  const T2& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT1;
+  typedef typename T2::elem_type eT2;
+  
+  typedef typename promote_type<eT1,eT2>::result out_eT;
+  
+  promote_type<eT1,eT2>::check();
+  
+  return mtGlue<out_eT, T1, T2, glue_mixed_schur>( X, Y );
+  }
+
+
+
+//! element-wise multiplication of two sparse matrices
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  SpGlue<T1,T2,spglue_schur>
+  >::result
+operator%
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return SpGlue<T1,T2,spglue_schur>(x, y);
+  }
+
+
+
+//! element-wise multiplication of one dense and one sparse object
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  SpMat<typename T1::elem_type>
+  >::result
+operator%
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> out;
+  
+  spglue_schur_misc::dense_schur_sparse(out, x, y);
+  
+  return out;
+  }
+
+
+
+//! element-wise multiplication of one sparse and one dense object
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::value),
+  SpMat<typename T1::elem_type>
+  >::result
+operator%
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> out;
+  
+  // Just call the other order (these operations are commutative)
+  // TODO: if there is a matrix size mismatch, the debug assert will print the matrix sizes in wrong order
+  spglue_schur_misc::dense_schur_sparse(out, y, x);
+  
+  return out;
+  }
+
+
+
+//! optimization: sparse % (sparse +/- scalar) can be done without forming the dense result of the (sparse +/- scalar) term
+template<typename T1, typename T2, typename op_type>
+inline
+typename
+enable_if2
+  <
+  (
+  is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value &&
+  is_same_type<typename T1::elem_type, typename T2::elem_type>::yes &&
+      (is_same_type<op_type, op_sp_plus>::value ||
+       is_same_type<op_type, op_sp_minus_pre>::value ||
+       is_same_type<op_type, op_sp_minus_post>::value)
+  ),
+  SpMat<typename T1::elem_type>
+  >::result
+operator%
+  (
+  const T1& x,
+  const SpToDOp<T2, op_type>& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> out;
+  
+  op_type::apply_inside_schur(out, x, y);
+  
+  return out;
+  }
+
+
+
+//! optimization: (sparse +/- scalar) % sparse can be done without forming the dense result of the (sparse +/- scalar) term
+template<typename T1, typename T2, typename op_type>
+inline
+typename
+enable_if2
+  <
+  (
+  is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value &&
+  is_same_type<typename T1::elem_type, typename T2::elem_type>::yes &&
+      (is_same_type<op_type, op_sp_plus>::value ||
+       is_same_type<op_type, op_sp_minus_pre>::value ||
+       is_same_type<op_type, op_sp_minus_post>::value)
+  ),
+  SpMat<typename T1::elem_type>
+  >::result
+operator%
+  (
+  const SpToDOp<T1, op_type>& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat<typename T1::elem_type> out;
+  
+  // Just call the other order (these operations are commutative)
+  // TODO: if there is a matrix size mismatch, the debug assert will print the matrix sizes in wrong order
+  op_type::apply_inside_schur(out, y, x);
+  
+  return out;
+  }
+
+
+
+//! element-wise multiplication of two sparse objects with different element types
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::no),
+  const mtSpGlue< typename promote_type<typename T1::elem_type, typename T2::elem_type>::result, T1, T2, spglue_schur_mixed >
+  >::result
+operator%
+  (
+  const T1& X,
+  const T2& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT1;
+  typedef typename T2::elem_type eT2;
+  
+  typedef typename promote_type<eT1,eT2>::result out_eT;
+  
+  promote_type<eT1,eT2>::check();
+  
+  return mtSpGlue<out_eT, T1, T2, spglue_schur_mixed>( X, Y );
+  }
+
+
+
+//! element-wise multiplication of one dense and one sparse object with different element types
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_type<T1>::value && is_arma_sparse_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::no),
+  SpMat< typename promote_type<typename T1::elem_type, typename T2::elem_type>::result >
+  >::result
+operator%
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat< typename promote_type<typename T1::elem_type, typename T2::elem_type>::result > out;
+  
+  spglue_schur_mixed::dense_schur_sparse(out, x, y);
+  
+  return out;
+  }
+
+
+
+//! element-wise multiplication of one sparse and one dense object with different element types
+template<typename T1, typename T2>
+inline
+typename
+enable_if2
+  <
+  (is_arma_sparse_type<T1>::value && is_arma_type<T2>::value && is_same_type<typename T1::elem_type, typename T2::elem_type>::no),
+  SpMat< typename promote_type<typename T1::elem_type, typename T2::elem_type>::result >
+  >::result
+operator%
+  (
+  const T1& x,
+  const T2& y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  SpMat< typename promote_type<typename T1::elem_type, typename T2::elem_type>::result > out;
+  
+  // Just call the other order (these operations are commutative)
+  // TODO: if there is a matrix size mismatch, the debug assert will print the matrix sizes in wrong order
+  spglue_schur_mixed::dense_schur_sparse(out, y, x);
+  
+  return out;
+  }
+
+
+
+template<typename parent, unsigned int mode, typename T2>
+inline
+Mat<typename parent::elem_type>
+operator%
+  (
+  const subview_each1<parent,mode>&          X,
+  const Base<typename parent::elem_type,T2>& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each1_aux::operator_schur(X, Y.get_ref());
+  }
+
+
+
+template<typename T1, typename parent, unsigned int mode>
+arma_inline
+Mat<typename parent::elem_type>
+operator%
+  (
+  const Base<typename parent::elem_type,T1>& X,
+  const subview_each1<parent,mode>&          Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each1_aux::operator_schur(Y, X.get_ref());  // NOTE: swapped order
+  }
+
+
+
+template<typename parent, unsigned int mode, typename TB, typename T2>
+inline
+Mat<typename parent::elem_type>
+operator%
+  (
+  const subview_each2<parent,mode,TB>&       X,
+  const Base<typename parent::elem_type,T2>& Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each2_aux::operator_schur(X, Y.get_ref());
+  }
+
+
+
+template<typename T1, typename parent, unsigned int mode, typename TB>
+arma_inline
+Mat<typename parent::elem_type>
+operator%
+  (
+  const Base<typename parent::elem_type,T1>& X,
+  const subview_each2<parent,mode,TB>&       Y
+  )
+  {
+  arma_extra_debug_sigprint();
+  
+  return subview_each2_aux::operator_schur(Y, X.get_ref());  // NOTE: swapped order
+  }
+
+
+
+//! @}