/[escript]/trunk/escript/src/DataConstant.h
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Contents of /trunk/escript/src/DataConstant.h

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Revision 775 - (show annotations)
Mon Jul 10 04:00:08 2006 UTC (13 years, 1 month ago) by ksteube
File MIME type: text/plain
File size: 7295 byte(s)
Modified the following python methods in escript/py_src/util.py to
call faster C++ methods:
	escript_trace
	escript_transpose
	escript_symmetric
	escript_nonsymmetric

1 //$Id$
2 /*
3 ************************************************************
4 * Copyright 2006 by ACcESS MNRF *
5 * *
6 * http://www.access.edu.au *
7 * Primary Business: Queensland, Australia *
8 * Licensed under the Open Software License version 3.0 *
9 * http://www.opensource.org/licenses/osl-3.0.php *
10 * *
11 ************************************************************
12 */
13
14 #if !defined escript_DataConstant_20040323_H
15 #define escript_DataConstant_20040323_H
16 #include "system_dep.h"
17
18 #include "DataAbstract.h"
19 #include "DataArrayView.h"
20
21 #include <boost/python/numeric.hpp>
22
23 namespace escript {
24
25 /**
26 \brief
27 DataConstant stores a single data point which represents the entire
28 function space.
29
30 Description:
31 DataConstant stores a single data point which represents the entire
32 function space.
33 */
34 class DataConstant : public DataAbstract {
35
36 public:
37
38 /**
39 \brief
40 Constructor for DataConstant objects.
41
42 Description:
43 Constructor for DataConstant objects.
44
45 \param value - Input - Data value for a single point.
46 \param what - Input - A description of what this data object represents.
47 */
48 ESCRIPT_DLL_API
49 DataConstant(const boost::python::numeric::array& value,
50 const FunctionSpace& what);
51
52 /**
53 \brief
54 Copy constructor. Performs a deep copy.
55 */
56 ESCRIPT_DLL_API
57 DataConstant(const DataConstant& other);
58
59 /**
60 \brief
61 Alternative constructor for DataConstant objects.
62
63 Description:
64 Alternative Constructor for DataConstant objects.
65 \param value - Input - Data value for a single point.
66 \param what - Input - A description of what this data object represents.
67 */
68 ESCRIPT_DLL_API
69 DataConstant(const DataArrayView& value,
70 const FunctionSpace& what);
71
72 /**
73 \brief
74 Alternative constructor for DataConstant objects.
75
76 Description:
77 Alternative Constructor for DataConstant objects.
78 \param other - Input - Data object to copy from.
79 \param region - Input - region to copy.
80 */
81 ESCRIPT_DLL_API
82 DataConstant(const DataConstant& other,
83 const DataArrayView::RegionType& region);
84
85 /**
86 \brief
87 Alternative constructor for DataConstant objects.
88
89 Description:
90 Alternative Constructor for DataConstant objects.
91 \param what - Input - A description of what this data object represents.
92 \param shape - Input - the shape of each data-point.
93 \param data - the data values for each data-point.
94 */
95 ESCRIPT_DLL_API
96 DataConstant(const FunctionSpace& what,
97 const DataArrayView::ShapeType &shape,
98 const DataArrayView::ValueType &data);
99
100 /**
101 \brief
102 Write the data as a string.
103 */
104 ESCRIPT_DLL_API
105 std::string
106 toString() const;
107
108 /**
109 \brief
110 Return the offset for the given sample. This is a somewhat artificial notion
111 but returns the offset in bytes for the given point into the container
112 holding the point data. Only really necessary to avoid many DataArrayView
113 objects.
114 \param sampleNo - Input - sample number.
115 \param dataPointNo - Input - data point number for the sample.
116 */
117 ESCRIPT_DLL_API
118 virtual
119 DataArrayView::ValueType::size_type
120 getPointOffset(int sampleNo,
121 int dataPointNo) const;
122
123 /**
124 \brief
125 Return a view into the data for the data point specified.
126 \param sampleNo - Input - sample number.
127 \param dataPointNo - Input - data point number for the sample.
128 */
129 ESCRIPT_DLL_API
130 virtual
131 DataArrayView
132 getDataPoint(int sampleNo,
133 int dataPointNo);
134
135 /**
136 \brief
137 Return the number of doubles stored for the Data object.
138 */
139 ESCRIPT_DLL_API
140 virtual
141 DataArrayView::ValueType::size_type
142 getLength() const;
143
144 /**
145 \brief
146 Factory method that returns a newly created DataConstant object
147 sliced from the specified region of this object.
148 The caller is reponsible for managing the object created.
149 \param region - Input - region to slice from this object.
150 */
151 ESCRIPT_DLL_API
152 virtual
153 DataAbstract*
154 getSlice(const DataArrayView::RegionType& region) const;
155
156 /**
157 \brief
158 Copy the specified region from the given value.
159 \param value - Input - Data object to copy from.
160 \param region - Input - Region to copy.
161 */
162 ESCRIPT_DLL_API
163 virtual
164 void
165 setSlice(const DataAbstract* value,
166 const DataArrayView::RegionType& region);
167
168 /**
169 \brief
170 Reshape the data point if the data point is currently rank 0.
171 The original data point value is used for all values of the new
172 data point.
173 */
174 ESCRIPT_DLL_API
175 void
176 reshapeDataPoint(const DataArrayView::ShapeType& shape);
177
178 /**
179 \brief
180 Archive the underlying data values to the file referenced
181 by ofstream. A count of the number of values expected to be written
182 is provided as a cross-check.
183
184 The return value indicates success (0) or otherwise (1).
185 */
186 ESCRIPT_DLL_API
187 int
188 archiveData(std::ofstream& archiveFile,
189 const DataArrayView::ValueType::size_type noValues) const;
190
191 /**
192 \brief
193 Extract the number of values specified by noValues from the file
194 referenced by ifstream to the underlying data structure.
195
196 The return value indicates success (0) or otherwise (1).
197 */
198 ESCRIPT_DLL_API
199 int
200 extractData(std::ifstream& archiveFile,
201 const DataArrayView::ValueType::size_type noValues);
202
203 /**
204 \brief
205 Computes a symmetric matrix (A + AT) / 2
206
207 \param ev - Output - symmetric matrix
208
209 */
210 virtual void
211 symmetric(DataAbstract* ev);
212
213 /**
214 \brief
215 Computes a nonsymmetric matrix (A - AT) / 2
216
217 \param ev - Output - nonsymmetric matrix
218
219 */
220 virtual void
221 nonsymmetric(DataAbstract* ev);
222
223 /**
224 \brief
225 Computes the trace of a matrix
226
227 \param ev - Output - trace of matrix
228
229 */
230 virtual void
231 matrixtrace(DataAbstract* ev, int axis_offset);
232
233 /**
234 \brief
235 Transpose each data point of this Data object around the given axis.
236
237 \param ev - Output - transpose of matrix
238
239 */
240 virtual void
241 transpose(DataAbstract* ev, int axis_offset);
242
243 /**
244 \brief
245 solves the eigenvalue problem this*V=ev*V for the eigenvalues ev
246
247 \param ev - Output - eigenvalues in increasing order at each data point
248
249 */
250 ESCRIPT_DLL_API
251 virtual void
252 eigenvalues(DataAbstract* ev);
253
254 /**
255 \brief
256 solves the eigenvalue problem this*V=ev*V for the eigenvalues ev and eigenvectors V
257
258 \param ev - Output - eigenvalues in increasing order at each data point
259 \param V - Output - corresponding eigenvectors. They are normalized such that their length is one
260 and the first nonzero component is positive.
261 \param tol - Input - eigenvalue with relative distance tol are treated as equal.
262
263 */
264
265 ESCRIPT_DLL_API
266 virtual void
267 eigenvalues_and_eigenvectors(DataAbstract* ev,DataAbstract* V,const double tol=1.e-13);
268
269
270 protected:
271
272 private:
273 //
274 // the actual data
275 DataArrayView::ValueType m_data;
276
277 };
278
279 } // end of namespace
280 #endif

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