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// 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_sprandn
//! @{
//! Generate a sparse matrix with a randomly selected subset of the elements
//! set to random values from a Gaussian distribution with zero mean and unit variance
template<typename obj_type>
arma_warn_unused
inline
obj_type
sprandn
(
const uword n_rows,
const uword n_cols,
const double density,
const typename arma_SpMat_SpCol_SpRow_only<obj_type>::result* junk = nullptr
)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
if(is_SpCol<obj_type>::value)
{
arma_debug_check( (n_cols != 1), "sprandn(): incompatible size" );
}
else
if(is_SpRow<obj_type>::value)
{
arma_debug_check( (n_rows != 1), "sprandn(): incompatible size" );
}
obj_type out;
out.sprandn(n_rows, n_cols, density);
return out;
}
template<typename obj_type>
arma_warn_unused
inline
obj_type
sprandn(const SizeMat& s, const double density, const typename arma_SpMat_SpCol_SpRow_only<obj_type>::result* junk = nullptr)
{
arma_extra_debug_sigprint();
arma_ignore(junk);
return sprandn<obj_type>(s.n_rows, s.n_cols, density);
}
arma_warn_unused
inline
sp_mat
sprandn(const uword n_rows, const uword n_cols, const double density)
{
arma_extra_debug_sigprint();
sp_mat out;
out.sprandn(n_rows, n_cols, density);
return out;
}
arma_warn_unused
inline
sp_mat
sprandn(const SizeMat& s, const double density)
{
arma_extra_debug_sigprint();
sp_mat out;
out.sprandn(s.n_rows, s.n_cols, density);
return out;
}
//! 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 random values from a Gaussian distribution with zero mean and unit variance
template<typename T1>
arma_warn_unused
inline
SpMat<typename T1::elem_type>
sprandn(const SpBase<typename T1::elem_type, T1>& X)
{
arma_extra_debug_sigprint();
typedef typename T1::elem_type eT;
SpMat<eT> out( X.get_ref() );
arma_rng::randn<eT>::fill( access::rwp(out.values), out.n_nonzero );
return out;
}
//! @}
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