Dune Core Modules (2.4.1)

densevector.hh
Go to the documentation of this file.
1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_DENSEVECTOR_HH
4#define DUNE_DENSEVECTOR_HH
5
6#include <limits>
7#include <type_traits>
8
9#include "genericiterator.hh"
10#include "ftraits.hh"
11#include "matvectraits.hh"
12#include "promotiontraits.hh"
13#include "dotproduct.hh"
14
15namespace Dune {
16
17 // forward declaration of template
18 template<typename V> class DenseVector;
19
20 template<typename V>
21 struct FieldTraits< DenseVector<V> >
22 {
23 typedef typename FieldTraits< typename DenseMatVecTraits<V>::value_type >::field_type field_type;
24 typedef typename FieldTraits< typename DenseMatVecTraits<V>::value_type >::real_type real_type;
25 };
26
36 namespace fvmeta
37 {
42 template<class K>
43 inline typename FieldTraits<K>::real_type absreal (const K& k)
44 {
45 using std::abs;
46 return abs(k);
47 }
48
53 template<class K>
54 inline typename FieldTraits<K>::real_type absreal (const std::complex<K>& c)
55 {
56 using std::abs;
57 return abs(c.real()) + abs(c.imag());
58 }
59
64 template<class K>
65 inline typename FieldTraits<K>::real_type abs2 (const K& k)
66 {
67 return k*k;
68 }
69
74 template<class K>
75 inline typename FieldTraits<K>::real_type abs2 (const std::complex<K>& c)
76 {
77 return c.real()*c.real() + c.imag()*c.imag();
78 }
79
84 template<class K, bool isInteger = std::numeric_limits<K>::is_integer>
85 struct Sqrt
86 {
87 static inline typename FieldTraits<K>::real_type sqrt (const K& k)
88 {
89 using std::sqrt;
90 return sqrt(k);
91 }
92 };
93
98 template<class K>
99 struct Sqrt<K, true>
100 {
101 static inline typename FieldTraits<K>::real_type sqrt (const K& k)
102 {
103 using std::sqrt;
104 return typename FieldTraits<K>::real_type(sqrt(double(k)));
106 };
107
112 template<class K>
113 inline typename FieldTraits<K>::real_type sqrt (const K& k)
114 {
115 return Sqrt<K>::sqrt(k);
116 }
117
118 }
119
124 template<class C, class T, class R =T&>
126 public Dune::RandomAccessIteratorFacade<DenseIterator<C,T,R>,T, R, std::ptrdiff_t>
127 {
128 friend class DenseIterator<typename remove_const<C>::type, typename remove_const<T>::type, typename mutable_reference<R>::type >;
129 friend class DenseIterator<const typename remove_const<C>::type, const typename remove_const<T>::type, typename const_reference<R>::type >;
130
131 typedef DenseIterator<typename remove_const<C>::type, typename remove_const<T>::type, typename mutable_reference<R>::type > MutableIterator;
132 typedef DenseIterator<const typename remove_const<C>::type, const typename remove_const<T>::type, typename const_reference<R>::type > ConstIterator;
133 public:
134
138 typedef std::ptrdiff_t DifferenceType;
139
143 typedef typename C::size_type SizeType;
144
145 // Constructors needed by the base iterators.
147 : container_(0), position_()
148 {}
149
150 DenseIterator(C& cont, SizeType pos)
151 : container_(&cont), position_(pos)
152 {}
153
154 DenseIterator(const MutableIterator & other)
155 : container_(other.container_), position_(other.position_)
156 {}
157
158 DenseIterator(const ConstIterator & other)
159 : container_(other.container_), position_(other.position_)
160 {}
161
162 // Methods needed by the forward iterator
163 bool equals(const MutableIterator &other) const
164 {
165 return position_ == other.position_ && container_ == other.container_;
166 }
167
168
169 bool equals(const ConstIterator & other) const
170 {
171 return position_ == other.position_ && container_ == other.container_;
172 }
173
174 R dereference() const {
175 return container_->operator[](position_);
176 }
177
178 void increment(){
179 ++position_;
180 }
181
182 // Additional function needed by BidirectionalIterator
183 void decrement(){
184 --position_;
185 }
186
187 // Additional function needed by RandomAccessIterator
188 R elementAt(DifferenceType i) const {
189 return container_->operator[](position_+i);
190 }
191
192 void advance(DifferenceType n){
193 position_=position_+n;
194 }
195
196 DifferenceType distanceTo(DenseIterator<const typename remove_const<C>::type,const typename remove_const<T>::type> other) const
197 {
198 assert(other.container_==container_);
199 return other.position_ - position_;
200 }
201
202 DifferenceType distanceTo(DenseIterator<typename remove_const<C>::type, typename remove_const<T>::type> other) const
203 {
204 assert(other.container_==container_);
205 return other.position_ - position_;
206 }
207
210 {
211 return this->position_;
212 }
213
214 private:
215 C *container_;
216 SizeType position_;
217 };
218
232 template<typename V>
234 {
235 typedef DenseMatVecTraits<V> Traits;
236 // typedef typename Traits::value_type K;
237
238 // Curiously recurring template pattern
239 V & asImp() { return static_cast<V&>(*this); }
240 const V & asImp() const { return static_cast<const V&>(*this); }
241
242 // prohibit copying
243 DenseVector ( const DenseVector & );
244
245 protected:
246 // construction allowed to derived classes only
247 DenseVector () {}
248
249 public:
250 //===== type definitions and constants
251
253 typedef typename Traits::derived_type derived_type;
254
256 typedef typename Traits::value_type value_type;
257
259 typedef typename Traits::value_type field_type;
260
262 typedef typename Traits::value_type block_type;
263
265 typedef typename Traits::size_type size_type;
266
268 enum {
270 blocklevel = 1
271 };
272
273 //===== assignment from scalar
276 {
277 for (size_type i=0; i<size(); i++)
278 asImp()[i] = k;
279 return asImp();
280 }
281
282 //===== access to components
283
286 {
287 return asImp().vec_access(i);
288 }
289
290 const value_type & operator[] (size_type i) const
291 {
292 return asImp().vec_access(i);
293 }
294
297 {
298 return asImp().vec_size();
299 }
300
305
308 {
309 return Iterator(*this,0);
310 }
311
314 {
315 return Iterator(*this,size());
316 }
317
321 {
322 return Iterator(*this,size()-1);
323 }
324
328 {
329 return Iterator(*this,-1);
330 }
331
334 {
335 return Iterator(*this,std::min(i,size()));
336 }
337
342
345 {
346 return ConstIterator(*this,0);
347 }
348
351 {
352 return ConstIterator(*this,size());
353 }
354
358 {
359 return ConstIterator(*this,size()-1);
360 }
361
365 {
366 return ConstIterator(*this,-1);
367 }
368
371 {
372 return ConstIterator(*this,std::min(i,size()));
373 }
374
375 //===== vector space arithmetic
376
378 template <class Other>
380 {
381 assert(y.size() == size());
382 for (size_type i=0; i<size(); i++)
383 (*this)[i] += y[i];
384 return asImp();
385 }
386
388 template <class Other>
390 {
391 assert(y.size() == size());
392 for (size_type i=0; i<size(); i++)
393 (*this)[i] -= y[i];
394 return asImp();
395 }
396
398 template <class Other>
400 {
401 derived_type z = asImp();
402 return (z+=b);
403 }
404
406 template <class Other>
408 {
409 derived_type z = asImp();
410 return (z-=b);
411 }
412
414
422 template <typename ValueType>
423 typename std::enable_if<
424 std::is_convertible<ValueType, value_type>::value,
426 >::type&
427 operator+= (const ValueType& kk)
428 {
429 const value_type& k = kk;
430 for (size_type i=0; i<size(); i++)
431 (*this)[i] += k;
432 return asImp();
433 }
434
436
444 template <typename ValueType>
445 typename std::enable_if<
446 std::is_convertible<ValueType, value_type>::value,
448 >::type&
449 operator-= (const ValueType& kk)
450 {
451 const value_type& k = kk;
452 for (size_type i=0; i<size(); i++)
453 (*this)[i] -= k;
454 return asImp();
455 }
456
458
466 template <typename ValueType>
467 typename std::enable_if<
468 std::is_convertible<ValueType, value_type>::value,
470 >::type&
471 operator*= (const ValueType& kk)
472 {
473 const value_type& k = kk;
474 for (size_type i=0; i<size(); i++)
475 (*this)[i] *= k;
476 return asImp();
477 }
478
480
488 template <typename ValueType>
489 typename std::enable_if<
490 std::is_convertible<ValueType, value_type>::value,
492 >::type&
493 operator/= (const ValueType& kk)
494 {
495 const value_type& k = kk;
496 for (size_type i=0; i<size(); i++)
497 (*this)[i] /= k;
498 return asImp();
499 }
500
502 template <class Other>
503 bool operator== (const DenseVector<Other>& y) const
504 {
505 assert(y.size() == size());
506 for (size_type i=0; i<size(); i++)
507 if ((*this)[i]!=y[i])
508 return false;
509
510 return true;
511 }
512
514 template <class Other>
515 bool operator!= (const DenseVector<Other>& y) const
516 {
517 return !operator==(y);
518 }
519
520
522 template <class Other>
524 {
525 assert(y.size() == size());
526 for (size_type i=0; i<size(); i++)
527 (*this)[i] += a*y[i];
528 return asImp();
529 }
530
538 template<class Other>
539 typename PromotionTraits<field_type,typename DenseVector<Other>::field_type>::PromotedType operator* (const DenseVector<Other>& y) const {
540 typedef typename PromotionTraits<field_type, typename DenseVector<Other>::field_type>::PromotedType PromotedType;
541 PromotedType result(0);
542 assert(y.size() == size());
543 for (size_type i=0; i<size(); i++) {
544 result += PromotedType((*this)[i]*y[i]);
545 }
546 return result;
547 }
548
556 template<class Other>
557 typename PromotionTraits<field_type,typename DenseVector<Other>::field_type>::PromotedType dot(const DenseVector<Other>& y) const {
558 typedef typename PromotionTraits<field_type, typename DenseVector<Other>::field_type>::PromotedType PromotedType;
559 PromotedType result(0);
560 assert(y.size() == size());
561 for (size_type i=0; i<size(); i++) {
562 result += Dune::dot((*this)[i],y[i]);
563 }
564 return result;
565 }
566
567 //===== norms
568
570 typename FieldTraits<value_type>::real_type one_norm() const {
571 using std::abs;
572 typename FieldTraits<value_type>::real_type result( 0 );
573 for (size_type i=0; i<size(); i++)
574 result += abs((*this)[i]);
575 return result;
576 }
577
578
580 typename FieldTraits<value_type>::real_type one_norm_real () const
581 {
582 typename FieldTraits<value_type>::real_type result( 0 );
583 for (size_type i=0; i<size(); i++)
584 result += fvmeta::absreal((*this)[i]);
585 return result;
586 }
587
589 typename FieldTraits<value_type>::real_type two_norm () const
590 {
591 typename FieldTraits<value_type>::real_type result( 0 );
592 for (size_type i=0; i<size(); i++)
593 result += fvmeta::abs2((*this)[i]);
594 return fvmeta::sqrt(result);
595 }
596
598 typename FieldTraits<value_type>::real_type two_norm2 () const
599 {
600 typename FieldTraits<value_type>::real_type result( 0 );
601 for (size_type i=0; i<size(); i++)
602 result += fvmeta::abs2((*this)[i]);
603 return result;
604 }
605
607 typename FieldTraits<value_type>::real_type infinity_norm () const
608 {
609 using std::abs;
610 using std::max;
611 typedef typename FieldTraits<value_type>::real_type real_type;
612
613 if (size() == 0)
614 return 0.0;
615
616 ConstIterator it = begin();
617 real_type max_val = abs(*it);
618 for (it = it + 1; it != end(); ++it)
619 max_val = max(max_val, real_type(abs(*it)));
620
621 return max_val;
622 }
623
625 typename FieldTraits<value_type>::real_type infinity_norm_real () const
626 {
627 using std::max;
628
629 if (size() == 0)
630 return 0.0;
631
632 ConstIterator it = begin();
633 typename FieldTraits<value_type>::real_type max_val = fvmeta::absreal(*it);
634 for (it = it + 1; it != end(); ++it)
635 max_val = max(max_val, fvmeta::absreal(*it));
636
637 return max_val;
638 }
639
640 //===== sizes
641
643 size_type N () const
644 {
645 return size();
646 }
647
649 size_type dim () const
650 {
651 return size();
652 }
653
654 };
655
664 template<typename V>
665 std::ostream& operator<< (std::ostream& s, const DenseVector<V>& v)
666 {
667 for (typename DenseVector<V>::size_type i=0; i<v.size(); i++)
668 s << ((i>0) ? " " : "") << v[i];
669 return s;
670 }
671
674} // end namespace
675
676#endif // DUNE_DENSEVECTOR_HH
Generic iterator class for dense vector and matrix implementations.
Definition: densevector.hh:127
SizeType index() const
return index
Definition: densevector.hh:209
std::ptrdiff_t DifferenceType
The type of the difference between two positions.
Definition: densevector.hh:138
C::size_type SizeType
The type to index the underlying container.
Definition: densevector.hh:143
Interface for a class of dense vectors over a given field.
Definition: densevector.hh:234
Traits::value_type value_type
export the type representing the field
Definition: densevector.hh:256
FieldTraits< value_type >::real_type two_norm2() const
square of two norm (sum over squared values of entries), need for block recursion
Definition: densevector.hh:598
ConstIterator const_iterator
typedef for stl compliant access
Definition: densevector.hh:341
Iterator iterator
typedef for stl compliant access
Definition: densevector.hh:304
ConstIterator find(size_type i) const
return iterator to given element or end()
Definition: densevector.hh:370
ConstIterator end() const
end ConstIterator
Definition: densevector.hh:350
FieldTraits< value_type >::real_type two_norm() const
two norm sqrt(sum over squared values of entries)
Definition: densevector.hh:589
ConstIterator beforeBegin() const
Definition: densevector.hh:364
PromotionTraits< field_type, typenameDenseVector< Other >::field_type >::PromotedType dot(const DenseVector< Other > &y) const
vector dot product which corresponds to Petsc's VecDot
Definition: densevector.hh:557
Iterator begin()
begin iterator
Definition: densevector.hh:307
derived_type & axpy(const value_type &a, const DenseVector< Other > &y)
vector space axpy operation ( *this += a y )
Definition: densevector.hh:523
Iterator beforeBegin()
Definition: densevector.hh:327
DenseIterator< const DenseVector, const value_type > ConstIterator
ConstIterator class for sequential access.
Definition: densevector.hh:339
Traits::derived_type derived_type
type of derived vector class
Definition: densevector.hh:253
derived_type operator+(const DenseVector< Other > &b) const
Binary vector addition.
Definition: densevector.hh:399
std::enable_if< std::is_convertible< ValueType, value_type >::value, derived_type >::type & operator/=(const ValueType &kk)
vector space division by scalar
Definition: densevector.hh:493
size_type size() const
size method
Definition: densevector.hh:296
derived_type & operator-=(const DenseVector< Other > &y)
vector space subtraction
Definition: densevector.hh:389
size_type dim() const
dimension of the vector space
Definition: densevector.hh:649
FieldTraits< value_type >::real_type infinity_norm_real() const
simplified infinity norm (uses Manhattan norm for complex values)
Definition: densevector.hh:625
ConstIterator beforeEnd() const
Definition: densevector.hh:357
derived_type & operator=(const value_type &k)
Assignment operator for scalar.
Definition: densevector.hh:275
Iterator end()
end iterator
Definition: densevector.hh:313
PromotionTraits< field_type, typenameDenseVector< Other >::field_type >::PromotedType operator*(const DenseVector< Other > &y) const
indefinite vector dot product which corresponds to Petsc's VecTDot
Definition: densevector.hh:539
Traits::size_type size_type
The type used for the index access and size operation.
Definition: densevector.hh:265
derived_type operator-(const DenseVector< Other > &b) const
Binary vector subtraction.
Definition: densevector.hh:407
DenseIterator< DenseVector, value_type > Iterator
Iterator class for sequential access.
Definition: densevector.hh:302
@ blocklevel
The number of block levels we contain.
Definition: densevector.hh:270
bool operator==(const DenseVector< Other > &y) const
Binary vector comparison.
Definition: densevector.hh:503
FieldTraits< value_type >::real_type infinity_norm() const
infinity norm (maximum of absolute values of entries)
Definition: densevector.hh:607
Iterator beforeEnd()
Definition: densevector.hh:320
std::enable_if< std::is_convertible< ValueType, value_type >::value, derived_type >::type & operator*=(const ValueType &kk)
vector space multiplication with scalar
Definition: densevector.hh:471
derived_type & operator+=(const DenseVector< Other > &y)
vector space addition
Definition: densevector.hh:379
ConstIterator begin() const
begin ConstIterator
Definition: densevector.hh:344
Traits::value_type block_type
export the type representing the components
Definition: densevector.hh:262
value_type & operator[](size_type i)
random access
Definition: densevector.hh:285
Traits::value_type field_type
export the type representing the field
Definition: densevector.hh:259
bool operator!=(const DenseVector< Other > &y) const
Binary vector incomparison.
Definition: densevector.hh:515
FieldTraits< value_type >::real_type one_norm_real() const
simplified one norm (uses Manhattan norm for complex values)
Definition: densevector.hh:580
Iterator find(size_type i)
return iterator to given element or end()
Definition: densevector.hh:333
FieldTraits< value_type >::real_type one_norm() const
one norm (sum over absolute values of entries)
Definition: densevector.hh:570
size_type N() const
number of blocks in the vector (are of size 1 here)
Definition: densevector.hh:643
Base class for stl conformant forward iterators.
Definition: iteratorfacades.hh:430
Provides the functions dot(a,b) := and dotT(a,b) := .
Type traits to determine the type of reals (when working with complex numbers)
Implements a generic iterator class for writing stl conformant iterators.
std::ostream & operator<<(std::ostream &s, const array< T, N > &e)
Output operator for array.
Definition: array.hh:26
enable_if<!IsVector< A >::value &&!is_same< typenameFieldTraits< A >::field_type, typenameFieldTraits< A >::real_type >::value, typenamePromotionTraits< A, B >::PromotedType >::type dot(const A &a, const B &b)
computes the dot product for fundamental data types according to Petsc's VectDot function: dot(a,...
Definition: dotproduct.hh:44
Documentation of the traits classes you need to write for each implementation of DenseVector or Dense...
Dune namespace.
Definition: alignment.hh:10
Provides some promotion traits.
get the 'mutable' version of a reference to a const object
Definition: genericiterator.hh:114
Creative Commons License   |  Legal Statements / Impressum  |  Hosted by TU Dresden  |  generated with Hugo v0.111.3 (Nov 21, 23:30, 2024)