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428 lines
18 KiB
428 lines
18 KiB
/* -*- c++ -*- (enables emacs c++ mode) */
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/*===========================================================================
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Copyright (C) 2002-2015 Yves Renard
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This file is a part of GETFEM++
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Getfem++ is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version along with the GCC Runtime Library
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Exception either version 3.1 or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License and GCC Runtime Library Exception for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, you may use this file as it is a part of a free
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software library without restriction. Specifically, if other files
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instantiate templates or use macros or inline functions from this file,
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or you compile this file and link it with other files to produce an
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executable, this file does not by itself cause the resulting executable
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to be covered by the GNU Lesser General Public License. This exception
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does not however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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===========================================================================*/
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/**@file gmm_scaled.h
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@author Yves Renard <Yves.Renard@insa-lyon.fr>
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@date November 10, 2002.
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@brief get a scaled view of a vector/matrix.
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*/
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#ifndef GMM_SCALED_H__
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#define GMM_SCALED_H__
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#include "gmm_def.h"
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namespace gmm {
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/* ********************************************************************* */
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/* Scaled references on vectors */
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/* ********************************************************************* */
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template <typename IT, typename S> struct scaled_const_iterator {
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typedef typename strongest_numeric_type<typename std::iterator_traits<IT>::value_type,
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S>::T value_type;
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typedef typename std::iterator_traits<IT>::pointer pointer;
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typedef typename std::iterator_traits<IT>::reference reference;
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typedef typename std::iterator_traits<IT>::difference_type difference_type;
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typedef typename std::iterator_traits<IT>::iterator_category
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iterator_category;
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IT it;
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S r;
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scaled_const_iterator(void) {}
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scaled_const_iterator(const IT &i, S x) : it(i), r(x) {}
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inline size_type index(void) const { return it.index(); }
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inline scaled_const_iterator operator ++(int)
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{ scaled_const_iterator tmp = *this; ++it; return tmp; }
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inline scaled_const_iterator operator --(int)
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{ scaled_const_iterator tmp = *this; --it; return tmp; }
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inline scaled_const_iterator &operator ++() { ++it; return *this; }
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inline scaled_const_iterator &operator --() { --it; return *this; }
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inline scaled_const_iterator &operator +=(difference_type i)
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{ it += i; return *this; }
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inline scaled_const_iterator &operator -=(difference_type i)
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{ it -= i; return *this; }
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inline scaled_const_iterator operator +(difference_type i) const
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{ scaled_const_iterator itb = *this; return (itb += i); }
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inline scaled_const_iterator operator -(difference_type i) const
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{ scaled_const_iterator itb = *this; return (itb -= i); }
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inline difference_type operator -(const scaled_const_iterator &i) const
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{ return difference_type(it - i.it); }
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inline value_type operator *() const { return (*it) * value_type(r); }
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inline value_type operator [](size_type ii) const { return it[ii] * r; }
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inline bool operator ==(const scaled_const_iterator &i) const
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{ return (i.it == it); }
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inline bool operator !=(const scaled_const_iterator &i) const
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{ return (i.it != it); }
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inline bool operator < (const scaled_const_iterator &i) const
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{ return (it < i.it); }
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};
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template <typename V, typename S> struct scaled_vector_const_ref {
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typedef scaled_vector_const_ref<V,S> this_type;
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typedef typename linalg_traits<this_type>::value_type value_type;
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typedef typename linalg_traits<V>::const_iterator iterator;
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typedef typename linalg_traits<this_type>::reference reference;
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typedef typename linalg_traits<this_type>::origin_type origin_type;
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iterator begin_, end_;
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const origin_type *origin;
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size_type size_;
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S r;
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scaled_vector_const_ref(const V &v, S rr)
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: begin_(vect_const_begin(v)), end_(vect_const_end(v)),
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origin(linalg_origin(v)), size_(vect_size(v)), r(rr) {}
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reference operator[](size_type i) const
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{ return value_type(r) * linalg_traits<V>::access(origin, begin_, end_, i); }
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};
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template <typename V, typename S> struct linalg_traits<scaled_vector_const_ref<V,S> > {
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typedef scaled_vector_const_ref<V,S> this_type;
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typedef linalg_const is_reference;
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typedef abstract_vector linalg_type;
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typedef typename strongest_numeric_type<S, typename linalg_traits<V>::value_type>::T value_type;
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typedef typename linalg_traits<V>::origin_type origin_type;
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typedef value_type reference;
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typedef abstract_null_type iterator;
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typedef scaled_const_iterator<typename linalg_traits<V>::const_iterator, S>
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const_iterator;
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typedef typename linalg_traits<V>::storage_type storage_type;
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typedef typename linalg_traits<V>::index_sorted index_sorted;
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static size_type size(const this_type &v) { return v.size_; }
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static const_iterator begin(const this_type &v)
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{ return const_iterator(v.begin_, v.r); }
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static const_iterator end(const this_type &v)
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{ return const_iterator(v.end_, v.r); }
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static const origin_type* origin(const this_type &v) { return v.origin; }
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static value_type access(const origin_type *o, const const_iterator &it,
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const const_iterator &ite, size_type i)
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{ return it.r * (linalg_traits<V>::access(o, it.it, ite.it, i)); }
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};
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template<typename V, typename S> std::ostream &operator <<
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(std::ostream &o, const scaled_vector_const_ref<V,S>& m)
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{ gmm::write(o,m); return o; }
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/* ********************************************************************* */
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/* Scaled references on matrices */
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/* ********************************************************************* */
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template <typename M, typename S> struct scaled_row_const_iterator {
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typedef scaled_row_const_iterator<M,S> iterator;
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typedef typename linalg_traits<M>::const_row_iterator ITER;
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typedef ptrdiff_t difference_type;
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typedef size_t size_type;
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ITER it;
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S r;
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inline iterator operator ++(int) { iterator tmp=*this; it++; return tmp; }
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inline iterator operator --(int) { iterator tmp=*this; it--; return tmp; }
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inline iterator &operator ++() { it++; return *this; }
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inline iterator &operator --() { it--; return *this; }
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iterator &operator +=(difference_type i) { it += i; return *this; }
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iterator &operator -=(difference_type i) { it -= i; return *this; }
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iterator operator +(difference_type i) const
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{ iterator itt = *this; return (itt += i); }
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iterator operator -(difference_type i) const
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{ iterator itt = *this; return (itt -= i); }
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difference_type operator -(const iterator &i) const
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{ return it - i.it; }
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inline ITER operator *() const { return it; }
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inline ITER operator [](int i) { return it + i; }
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inline bool operator ==(const iterator &i) const { return (it == i.it); }
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inline bool operator !=(const iterator &i) const { return !(i == *this); }
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inline bool operator < (const iterator &i) const { return (it < i.it); }
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scaled_row_const_iterator(void) {}
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scaled_row_const_iterator(const ITER &i, S rr)
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: it(i), r(rr) { }
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};
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template <typename M, typename S> struct scaled_row_matrix_const_ref {
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typedef scaled_row_matrix_const_ref<M,S> this_type;
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typedef typename linalg_traits<M>::const_row_iterator iterator;
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typedef typename linalg_traits<this_type>::value_type value_type;
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typedef typename linalg_traits<this_type>::origin_type origin_type;
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iterator begin_, end_;
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const origin_type *origin;
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S r;
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size_type nr, nc;
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scaled_row_matrix_const_ref(const M &m, S rr)
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: begin_(mat_row_begin(m)), end_(mat_row_end(m)),
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origin(linalg_origin(m)), r(rr), nr(mat_nrows(m)), nc(mat_ncols(m)) {}
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value_type operator()(size_type i, size_type j) const
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{ return r * linalg_traits<M>::access(begin_+i, j); }
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};
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template <typename M, typename S> struct linalg_traits<scaled_row_matrix_const_ref<M,S> > {
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typedef scaled_row_matrix_const_ref<M,S> this_type;
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typedef linalg_const is_reference;
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typedef abstract_matrix linalg_type;
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typedef typename linalg_traits<M>::origin_type origin_type;
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typedef typename strongest_numeric_type<S, typename linalg_traits<M>::value_type>::T value_type;
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typedef value_type reference;
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typedef typename linalg_traits<M>::storage_type storage_type;
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typedef typename linalg_traits<M>::const_sub_row_type vector_type;
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typedef scaled_vector_const_ref<vector_type,S> sub_row_type;
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typedef scaled_vector_const_ref<vector_type,S> const_sub_row_type;
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typedef scaled_row_const_iterator<M,S> row_iterator;
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typedef scaled_row_const_iterator<M,S> const_row_iterator;
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typedef abstract_null_type const_sub_col_type;
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typedef abstract_null_type sub_col_type;
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typedef abstract_null_type const_col_iterator;
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typedef abstract_null_type col_iterator;
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typedef row_major sub_orientation;
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typedef typename linalg_traits<M>::index_sorted index_sorted;
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static size_type nrows(const this_type &m)
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{ return m.nr; }
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static size_type ncols(const this_type &m)
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{ return m.nc; }
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static const_sub_row_type row(const const_row_iterator &it)
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{ return scaled(linalg_traits<M>::row(it.it), it.r); }
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static const_row_iterator row_begin(const this_type &m)
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{ return const_row_iterator(m.begin_, m.r); }
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static const_row_iterator row_end(const this_type &m)
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{ return const_row_iterator(m.end_, m.r); }
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static const origin_type* origin(const this_type &m) { return m.origin; }
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static value_type access(const const_row_iterator &it, size_type i)
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{ return it.r * (linalg_traits<M>::access(it.it, i)); }
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};
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template<typename M, typename S> std::ostream &operator <<
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(std::ostream &o, const scaled_row_matrix_const_ref<M,S>& m)
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{ gmm::write(o,m); return o; }
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template <typename M, typename S> struct scaled_col_const_iterator {
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typedef scaled_col_const_iterator<M,S> iterator;
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typedef typename linalg_traits<M>::const_col_iterator ITER;
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typedef ptrdiff_t difference_type;
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typedef size_t size_type;
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ITER it;
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S r;
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iterator operator ++(int) { iterator tmp = *this; it++; return tmp; }
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iterator operator --(int) { iterator tmp = *this; it--; return tmp; }
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iterator &operator ++() { it++; return *this; }
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iterator &operator --() { it--; return *this; }
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iterator &operator +=(difference_type i) { it += i; return *this; }
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iterator &operator -=(difference_type i) { it -= i; return *this; }
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iterator operator +(difference_type i) const
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{ iterator itt = *this; return (itt += i); }
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iterator operator -(difference_type i) const
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{ iterator itt = *this; return (itt -= i); }
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difference_type operator -(const iterator &i) const
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{ return it - i.it; }
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ITER operator *() const { return it; }
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ITER operator [](int i) { return it + i; }
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bool operator ==(const iterator &i) const { return (it == i.it); }
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bool operator !=(const iterator &i) const { return !(i == *this); }
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bool operator < (const iterator &i) const { return (it < i.it); }
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scaled_col_const_iterator(void) {}
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scaled_col_const_iterator(const ITER &i, S rr)
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: it(i), r(rr) { }
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};
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template <typename M, typename S> struct scaled_col_matrix_const_ref {
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typedef scaled_col_matrix_const_ref<M,S> this_type;
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typedef typename linalg_traits<M>::const_col_iterator iterator;
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typedef typename linalg_traits<this_type>::value_type value_type;
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typedef typename linalg_traits<this_type>::origin_type origin_type;
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iterator begin_, end_;
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const origin_type *origin;
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S r;
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size_type nr, nc;
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scaled_col_matrix_const_ref(const M &m, S rr)
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: begin_(mat_col_begin(m)), end_(mat_col_end(m)),
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origin(linalg_origin(m)), r(rr), nr(mat_nrows(m)), nc(mat_ncols(m)) {}
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value_type operator()(size_type i, size_type j) const
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{ return r * linalg_traits<M>::access(begin_+j, i); }
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};
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template <typename M, typename S> struct linalg_traits<scaled_col_matrix_const_ref<M,S> > {
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typedef scaled_col_matrix_const_ref<M,S> this_type;
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typedef linalg_const is_reference;
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typedef abstract_matrix linalg_type;
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typedef typename strongest_numeric_type<S, typename linalg_traits<M>::value_type>::T value_type;
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typedef typename linalg_traits<M>::origin_type origin_type;
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typedef value_type reference;
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typedef typename linalg_traits<M>::storage_type storage_type;
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typedef typename linalg_traits<M>::const_sub_col_type vector_type;
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typedef abstract_null_type sub_col_type;
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typedef scaled_vector_const_ref<vector_type,S> const_sub_col_type;
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typedef abstract_null_type col_iterator;
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typedef scaled_col_const_iterator<M,S> const_col_iterator;
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typedef abstract_null_type const_sub_row_type;
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typedef abstract_null_type sub_row_type;
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typedef abstract_null_type const_row_iterator;
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typedef abstract_null_type row_iterator;
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typedef col_major sub_orientation;
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typedef typename linalg_traits<M>::index_sorted index_sorted;
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static size_type ncols(const this_type &m)
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{ return m.nc; }
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static size_type nrows(const this_type &m)
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{ return m.nr; }
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static const_sub_col_type col(const const_col_iterator &it)
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{ return scaled(linalg_traits<M>::col(it.it), it.r); }
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static const_col_iterator col_begin(const this_type &m)
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{ return const_col_iterator(m.begin_, m.r); }
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static const_col_iterator col_end(const this_type &m)
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{ return const_col_iterator(m.end_, m.r); }
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static const origin_type* origin(const this_type &m) { return m.origin; }
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static value_type access(const const_col_iterator &it, size_type i)
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{ return it.r * (linalg_traits<M>::access(it.it, i)); }
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};
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template<typename M, typename S> std::ostream &operator <<
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(std::ostream &o, const scaled_col_matrix_const_ref<M,S>& m)
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{ gmm::write(o,m); return o; }
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template <typename L, typename S, typename R> struct scaled_return__ {
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typedef abstract_null_type return_type;
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};
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template <typename L, typename S> struct scaled_return__<L, S, row_major>
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{ typedef scaled_row_matrix_const_ref<L,S> return_type; };
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template <typename L, typename S> struct scaled_return__<L, S, col_major>
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{ typedef scaled_col_matrix_const_ref<L,S> return_type; };
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template <typename L, typename S, typename LT> struct scaled_return_ {
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typedef abstract_null_type return_type;
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};
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template <typename L, typename S> struct scaled_return_<L, S, abstract_vector>
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{ typedef scaled_vector_const_ref<L,S> return_type; };
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template <typename L, typename S> struct scaled_return_<L, S, abstract_matrix> {
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typedef typename scaled_return__<L, S,
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typename principal_orientation_type<typename
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linalg_traits<L>::sub_orientation>::potype>::return_type return_type;
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};
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template <typename L, typename S> struct scaled_return {
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typedef typename scaled_return_<L, S, typename
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linalg_traits<L>::linalg_type>::return_type return_type;
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};
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template <typename L, typename S> inline
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typename scaled_return<L,S>::return_type
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scaled(const L &v, S x)
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{ return scaled(v, x, typename linalg_traits<L>::linalg_type()); }
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template <typename V, typename S> inline
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typename scaled_return<V,S>::return_type
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scaled(const V &v, S x, abstract_vector)
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{ return scaled_vector_const_ref<V,S>(v, x); }
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template <typename M, typename S> inline
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typename scaled_return<M,S>::return_type
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scaled(const M &m, S x,abstract_matrix) {
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return scaled(m, x, typename principal_orientation_type<typename
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linalg_traits<M>::sub_orientation>::potype());
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}
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template <typename M, typename S> inline
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typename scaled_return<M,S>::return_type
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scaled(const M &m, S x, row_major) {
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return scaled_row_matrix_const_ref<M,S>(m, x);
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}
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template <typename M, typename S> inline
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typename scaled_return<M,S>::return_type
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scaled(const M &m, S x, col_major) {
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return scaled_col_matrix_const_ref<M,S>(m, x);
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}
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/* ******************************************************************** */
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/* matrix or vector scale */
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/* ******************************************************************** */
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template <typename L> inline
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void scale(L& l, typename linalg_traits<L>::value_type a)
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{ scale(l, a, typename linalg_traits<L>::linalg_type()); }
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template <typename L> inline
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void scale(const L& l, typename linalg_traits<L>::value_type a)
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{ scale(linalg_const_cast(l), a); }
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template <typename L> inline
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void scale(L& l, typename linalg_traits<L>::value_type a, abstract_vector) {
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typename linalg_traits<L>::iterator it = vect_begin(l), ite = vect_end(l);
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for ( ; it != ite; ++it) *it *= a;
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}
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template <typename L>
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void scale(L& l, typename linalg_traits<L>::value_type a, abstract_matrix) {
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scale(l, a, typename principal_orientation_type<typename
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linalg_traits<L>::sub_orientation>::potype());
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}
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template <typename L>
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void scale(L& l, typename linalg_traits<L>::value_type a, row_major) {
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typename linalg_traits<L>::row_iterator it = mat_row_begin(l),
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ite = mat_row_end(l);
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for ( ; it != ite; ++it) scale(linalg_traits<L>::row(it), a);
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}
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template <typename L>
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void scale(L& l, typename linalg_traits<L>::value_type a, col_major) {
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typename linalg_traits<L>::col_iterator it = mat_col_begin(l),
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ite = mat_col_end(l);
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for ( ; it != ite; ++it) scale(linalg_traits<L>::col(it), a);
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}
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}
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#endif // GMM_SCALED_H__
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