// 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;
}

//! @}
