115 lines
2.4 KiB
C++
115 lines
2.4 KiB
C++
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// Copyright (C) 2012-2015 National ICT Australia (NICTA)
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// -------------------------------------------------------------------
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//
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// Written by Conrad Sanderson - http://conradsanderson.id.au
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//! \addtogroup fn_sprandn
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//! @{
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//! Generate a sparse matrix with a randomly selected subset of the elements
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//! set to random values from a Gaussian distribution with zero mean and unit variance
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template<typename obj_type>
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inline
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obj_type
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sprandn
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(
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const uword n_rows,
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const uword n_cols,
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const double density,
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const typename arma_SpMat_SpCol_SpRow_only<obj_type>::result* junk = 0
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)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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if(is_SpCol<obj_type>::value == true)
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{
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arma_debug_check( (n_cols != 1), "sprandn(): incompatible size" );
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}
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else
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if(is_SpRow<obj_type>::value == true)
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{
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arma_debug_check( (n_rows != 1), "sprandn(): incompatible size" );
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}
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obj_type out;
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out.sprandn(n_rows, n_cols, density);
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return out;
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}
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template<typename obj_type>
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inline
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obj_type
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sprandn(const SizeMat& s, const double density, const typename arma_SpMat_SpCol_SpRow_only<obj_type>::result* junk = 0)
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{
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arma_extra_debug_sigprint();
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arma_ignore(junk);
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return sprandn<obj_type>(s.n_rows, s.n_cols, density);
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}
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inline
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sp_mat
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sprandn(const uword n_rows, const uword n_cols, const double density)
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{
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arma_extra_debug_sigprint();
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sp_mat out;
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out.sprandn(n_rows, n_cols, density);
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return out;
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}
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inline
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sp_mat
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sprandn(const SizeMat& s, const double density)
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{
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arma_extra_debug_sigprint();
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sp_mat out;
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out.sprandn(s.n_rows, s.n_cols, density);
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return out;
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}
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//! Generate a sparse matrix with the non-zero values in the same locations as in the given sparse matrix X,
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//! with the non-zero values set to random values from a Gaussian distribution with zero mean and unit variance
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template<typename T1>
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inline
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SpMat<typename T1::elem_type>
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sprandn(const SpBase<typename T1::elem_type, T1>& X)
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{
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arma_extra_debug_sigprint();
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typedef typename T1::elem_type eT;
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SpMat<eT> out( X.get_ref() );
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arma_rng::randn<eT>::fill( access::rwp(out.values), out.n_nonzero );
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return out;
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}
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//! @}
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