71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
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// Copyright 2008-2016 National ICT Australia (NICTA)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// ------------------------------------------------------------------------
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//! \addtogroup fn_rank
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//! @{
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template<typename T1>
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arma_warn_unused
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inline
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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 = nullptr
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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::elem_type eT;
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typedef typename T1::pod_type T;
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Mat<eT> A(X.get_ref());
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Col<T> s;
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const bool status = auxlib::svd_dc(s, A);
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if(status == false)
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{
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arma_stop_runtime_error("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)(A.n_rows, A.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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