129 lines
2.6 KiB
C++
129 lines
2.6 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_det
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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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typename enable_if2< is_supported_blas_type<typename T1::elem_type>::value, typename T1::elem_type >::result
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det(const Base<typename T1::elem_type,T1>& X)
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{
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arma_extra_debug_sigprint();
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const quasi_unwrap<T1> U(X.get_ref());
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arma_debug_check( (U.M.is_square() == false), "det(): given matrix must be square sized" );
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if( (U.M.n_rows > 4) && (U.M.is_diagmat()) )
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{
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return det(diagmat(U.M)); // call the specialised version of det()
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}
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return auxlib::det(U.M);
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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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typename T1::elem_type
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det(const Op<T1, op_diagmat>& 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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const diagmat_proxy<T1> A(X.m);
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arma_debug_check( (A.n_rows != A.n_cols), "det(): given matrix must be square sized" );
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const uword N = (std::min)(A.n_rows, A.n_cols);
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eT val1 = eT(1);
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eT val2 = eT(1);
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uword i,j;
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for(i=0, j=1; j<N; i+=2, j+=2)
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{
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val1 *= A[i];
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val2 *= A[j];
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}
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if(i < N)
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{
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val1 *= A[i];
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}
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return val1 * val2;
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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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typename T1::elem_type
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det(const Op<T1, op_trimat>& 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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const Proxy<T1> P(X.m);
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const uword N = P.get_n_rows();
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arma_debug_check( (N != P.get_n_cols()), "det(): given matrix must be square sized" );
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eT val1 = eT(1);
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eT val2 = eT(1);
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uword i,j;
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for(i=0, j=1; j<N; i+=2, j+=2)
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{
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val1 *= P.at(i,i);
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val2 *= P.at(j,j);
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}
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if(i < N)
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{
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val1 *= P.at(i,i);
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}
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return val1 * val2;
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}
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template<typename T>
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arma_warn_unused
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arma_inline
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typename arma_scalar_only<T>::result
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det(const T& x)
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{
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return x;
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}
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//! @}
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