57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
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// Copyright (C) 2012 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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// Written by Ryan Curtin
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//! \addtogroup spop_var
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//! @{
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//! Class for finding variance values of a sparse matrix
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class spop_var
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{
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public:
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template<typename T1>
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inline static void apply(SpMat<typename T1::pod_type>& out, const mtSpOp<typename T1::pod_type, T1, spop_var>& in);
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template<typename T1>
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inline static void apply_noalias(SpMat<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 = 0);
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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 = 0);
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};
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//! @}
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