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.
28 template<class Vector>
size_log(const int nb_point,const int size_min,const int size_max,Vector & X)29 void 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