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