1//=====================================================
2// File   :  size_log.hh
3// Author :  L. Plagne <laurent.plagne@edf.fr)>
4// Copyright (C) EDF R&D,  lun sep 30 14:23:17 CEST 2002
5//=====================================================
6//
7// This program is free software; you can redistribute it and/or
8// modify it under the terms of the GNU General Public License
9// as published by the Free Software Foundation; either version 2
10// of the License, or (at your option) any later version.
11//
12// This program is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16// You should have received a copy of the GNU General Public License
17// along with this program; if not, write to the Free Software
18// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19//
20#ifndef SIZE_LOG
21#define SIZE_LOG
22
23#include "math.h"
24// The Vector class must satisfy the following part of STL vector concept :
25//            resize() method
26//            [] operator for seting element
27// the vector element are int compatible.
28template<class Vector>
29void size_log(const int nb_point, const int size_min, const int size_max, Vector & X)
30{
31  X.resize(nb_point);
32
33  float ls_min=log(float(size_min));
34  float ls_max=log(float(size_max));
35
36  float ls=0.0;
37
38  float delta_ls=(ls_max-ls_min)/(float(nb_point-1));
39
40  int size=0;
41
42  for (int i=0;i<nb_point;i++){
43
44    ls = ls_min + float(i)*delta_ls ;
45
46    size=int(exp(ls));
47
48    X[i]=size;
49  }
50
51}
52
53
54#endif
55