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diff --git a/src/armadillo/include/armadillo_bits/fn_spones.hpp b/src/armadillo/include/armadillo_bits/fn_spones.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_spones
+//! @{
+
+
+
+//! Generate a sparse matrix with the non-zero values in the same locations as in the given sparse matrix X,
+//! with the non-zero values set to one
+template<typename T1>
+arma_warn_unused
+inline
+SpMat<typename T1::elem_type>
+spones(const SpBase<typename T1::elem_type, T1>& X)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const unwrap_spmat<T1> U(X.get_ref());
+  
+  SpMat<eT> out(arma_layout_indicator(), U.M);
+  
+  arrayops::inplace_set( access::rwp(out.values), eT(1), out.n_nonzero );
+  
+  return out;
+  }
+
+
+
+//! @}