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authorNao Pross <np@0hm.ch>2024-02-12 14:52:43 +0100
committerNao Pross <np@0hm.ch>2024-02-12 14:52:43 +0100
commiteda5bc26f44ee9a6f83dcf8c91f17296d7fc509d (patch)
treebc2efa38ff4e350f9a111ac87065cd7ae9a911c7 /src/armadillo/include/armadillo_bits/fn_diagmat.hpp
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+// SPDX-License-Identifier: Apache-2.0
+//
+// 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 (ie. 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);
+ }
+
+
+
+//! @}