63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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//
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// 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 op_sp_var
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//! @{
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//! Class for finding variance values of a sparse matrix
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class op_sp_var
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: public traits_op_xvec
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{
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public:
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template<typename T1>
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inline static void apply(Mat<typename T1::pod_type>& out, const mtSpReduceOp<typename T1::pod_type, T1, op_sp_var>& in);
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template<typename T1>
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inline static void apply_slow(Mat<typename T1::pod_type>& out, const SpProxy<T1>& p, const uword norm_type, const uword dim);
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// Calculate variance of a sparse vector, where we can directly use the memory.
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template<typename T1>
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inline static typename T1::pod_type var_vec(const T1& X, const uword norm_type = 0);
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// Calculate the variance directly. Because this is for sparse matrices, we
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// specify both the number of elements in the array (the length of the array)
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// as well as the actual number of elements when zeros are included.
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template<typename eT>
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inline static eT direct_var(const eT* const X, const uword length, const uword N, const uword norm_type = 0);
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// For complex numbers.
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template<typename T>
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inline static T direct_var(const std::complex<T>* const X, const uword length, const uword N, const uword norm_type = 0);
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// Calculate the variance using iterators, for non-complex numbers.
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template<typename T1, typename eT>
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inline static eT iterator_var(T1& it, const T1& end, const uword n_zero, const uword norm_type, const eT junk1, const typename arma_not_cx<eT>::result* junk2 = nullptr);
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// Calculate the variance using iterators, for complex numbers.
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template<typename T1, typename eT>
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inline static typename get_pod_type<eT>::result iterator_var(T1& it, const T1& end, const uword n_zero, const uword norm_type, const eT junk1, const typename arma_cx_only<eT>::result* junk2 = nullptr);
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};
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//! @}
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