66 lines
1.4 KiB
C++
66 lines
1.4 KiB
C++
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// Copyright (C) 2009-2015 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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// Written by Dimitrios Bouzas
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// Written by Stanislav Funiak
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//! \addtogroup fn_rank
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//! @{
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template<typename T1>
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inline
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arma_warn_unused
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uword
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rank
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(
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const Base<typename T1::elem_type,T1>& X,
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typename T1::pod_type tol = 0.0,
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const typename arma_blas_type_only<typename T1::elem_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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typedef typename T1::pod_type T;
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uword X_n_rows;
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uword X_n_cols;
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Col<T> s;
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const bool status = auxlib::svd_dc(s, X, X_n_rows, X_n_cols);
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if(status == false)
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{
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arma_bad("rank(): svd failed");
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return uword(0);
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}
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const uword s_n_elem = s.n_elem;
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const T* s_mem = s.memptr();
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// set tolerance to default if it hasn't been specified
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if( (tol == T(0)) && (s_n_elem > 0) )
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{
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tol = (std::max)(X_n_rows, X_n_cols) * s_mem[0] * std::numeric_limits<T>::epsilon();
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}
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uword count = 0;
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for(uword i=0; i < s_n_elem; ++i) { count += (s_mem[i] > tol) ? uword(1) : uword(0); }
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return count;
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}
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//! @}
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