source: trunk/yat/regression/GSLInterpolation.cc @ 1648

Last change on this file since 1648 was 1648, checked in by Jari Häkkinen, 13 years ago

Addresses #466. Added more GSL functionality, added constructor tests.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.4 KB
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1// $Id: GSLInterpolation.cc 1648 2008-12-13 09:28:39Z jari $
2
3/*
4  Copyright (C) 2008 Jari Häkkinen
5
6  This file is part of the yat library, http://dev.thep.lu.se/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 3 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with yat. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "GSLInterpolation.h"
23
24#include "yat/utility/VectorBase.h"
25
26#include <cassert>
27
28namespace theplu {
29namespace yat {
30namespace regression {
31
32
33  GSLInterpolation::GSLInterpolation(const gsl_interp_type* interpolator_type,
34                                     const utility::VectorBase& x,
35                                     const utility::VectorBase& y)
36  {
37    assert(x.size()==y.size());
38    size_t size=x.size();
39    x_=new double[size];
40    y_=new double[size];
41    for (size_t i=0; i<size; ++i) {
42      x_[i]=x(i);
43      y_[i]=y(i);
44    }
45    interpolator_ = gsl_interp_alloc(interpolator_type, size);
46    gsl_interp_init(interpolator_, x_, y_, size);
47    accelerator_ = gsl_interp_accel_alloc();
48  }
49
50
51  GSLInterpolation::~GSLInterpolation(void)
52  {
53    gsl_interp_free(interpolator_);
54    gsl_interp_accel_free(accelerator_);
55    delete x_;
56    delete y_;
57  }
58
59
60  size_t GSLInterpolation::bsearch(const double x_array[], double x,
61                                   size_t index_lo, size_t index_hi) const
62  {
63    return gsl_interp_bsearch(x_array, x, index_lo, index_hi);
64  }
65
66
67  double GSLInterpolation::evaluate(double x)
68  { 
69    return gsl_interp_eval(interpolator_, x_, y_, x, accelerator_);
70  }
71
72
73  double GSLInterpolation::evaluate_derivative(double x)
74  {
75    return gsl_interp_eval_deriv(interpolator_, x_, y_, x, accelerator_);
76  }
77
78
79  double GSLInterpolation::evaluate_derivative2(double x)
80  {
81    return gsl_interp_eval_deriv2(interpolator_, x_, y_, x, accelerator_);
82  }
83
84
85  double GSLInterpolation::evaluate_integral(double a, double b)
86  {
87    return gsl_interp_eval_integ(interpolator_, x_, y_, a, b, accelerator_);
88  }
89
90
91  unsigned int GSLInterpolation::min_size(void) const
92  {
93    return gsl_interp_min_size(interpolator_);
94  }
95
96
97}}} // of namespaces regression, yat, and theplu
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