82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
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// Copyright (C) 2008-2015 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_diagmat
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//! @{
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//! interpret a matrix or a vector as a diagonal matrix (i.e. off-diagonal entries are zero)
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template<typename T1>
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arma_inline
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typename
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enable_if2
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<
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is_arma_type<T1>::value,
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const Op<T1, op_diagmat>
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>::result
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diagmat(const T1& X)
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{
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arma_extra_debug_sigprint();
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return Op<T1, op_diagmat>(X);
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}
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//! create a matrix with the k-th diagonal set to the given vector
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template<typename T1>
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arma_inline
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typename
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enable_if2
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<
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is_arma_type<T1>::value,
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const Op<T1, op_diagmat2>
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>::result
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diagmat(const T1& X, const sword k)
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{
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arma_extra_debug_sigprint();
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const uword row_offset = (k < 0) ? uword(-k) : uword(0);
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const uword col_offset = (k > 0) ? uword( k) : uword(0);
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return Op<T1, op_diagmat2>(X, row_offset, col_offset);
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}
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template<typename T1>
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inline
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const SpOp<T1, spop_diagmat>
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diagmat(const SpBase<typename T1::elem_type,T1>& X)
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{
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arma_extra_debug_sigprint();
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return SpOp<T1, spop_diagmat>(X.get_ref());
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}
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template<typename T1>
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inline
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const SpOp<T1, spop_diagmat2>
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diagmat(const SpBase<typename T1::elem_type,T1>& X, const sword k)
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{
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arma_extra_debug_sigprint();
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const uword row_offset = (k < 0) ? uword(-k) : uword(0);
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const uword col_offset = (k > 0) ? uword( k) : uword(0);
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return SpOp<T1, spop_diagmat2>(X.get_ref(), row_offset, col_offset);
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}
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//! @}
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