92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
|
|
// Copyright 2008-2016 National ICT Australia (NICTA)
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
// ------------------------------------------------------------------------
|
|
|
|
|
|
//! \addtogroup fn_diagmat
|
|
//! @{
|
|
|
|
|
|
//! interpret a matrix or a vector as a diagonal matrix (i.e. off-diagonal entries are zero)
|
|
template<typename T1>
|
|
arma_warn_unused
|
|
arma_inline
|
|
typename
|
|
enable_if2
|
|
<
|
|
is_arma_type<T1>::value,
|
|
const Op<T1, op_diagmat>
|
|
>::result
|
|
diagmat(const T1& X)
|
|
{
|
|
arma_extra_debug_sigprint();
|
|
|
|
return Op<T1, op_diagmat>(X);
|
|
}
|
|
|
|
|
|
|
|
//! create a matrix with the k-th diagonal set to the given vector
|
|
template<typename T1>
|
|
arma_warn_unused
|
|
arma_inline
|
|
typename
|
|
enable_if2
|
|
<
|
|
is_arma_type<T1>::value,
|
|
const Op<T1, op_diagmat2>
|
|
>::result
|
|
diagmat(const T1& X, const sword k)
|
|
{
|
|
arma_extra_debug_sigprint();
|
|
|
|
const uword row_offset = (k < 0) ? uword(-k) : uword(0);
|
|
const uword col_offset = (k > 0) ? uword( k) : uword(0);
|
|
|
|
return Op<T1, op_diagmat2>(X, row_offset, col_offset);
|
|
}
|
|
|
|
|
|
|
|
template<typename T1>
|
|
arma_warn_unused
|
|
inline
|
|
const SpOp<T1, spop_diagmat>
|
|
diagmat(const SpBase<typename T1::elem_type,T1>& X)
|
|
{
|
|
arma_extra_debug_sigprint();
|
|
|
|
return SpOp<T1, spop_diagmat>(X.get_ref());
|
|
}
|
|
|
|
|
|
|
|
template<typename T1>
|
|
arma_warn_unused
|
|
inline
|
|
const SpOp<T1, spop_diagmat2>
|
|
diagmat(const SpBase<typename T1::elem_type,T1>& X, const sword k)
|
|
{
|
|
arma_extra_debug_sigprint();
|
|
|
|
const uword row_offset = (k < 0) ? uword(-k) : uword(0);
|
|
const uword col_offset = (k > 0) ? uword( k) : uword(0);
|
|
|
|
return SpOp<T1, spop_diagmat2>(X.get_ref(), row_offset, col_offset);
|
|
}
|
|
|
|
|
|
|
|
//! @}
|