Last change
on this file since 2730 was
2730,
checked in by Takeshi Nakazato, 11 years ago
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New Development: No
JIRA Issue: Yes CAS-4770
Ready for Test: Yes
Interface Changes: No
What Interface Changed: Please list interface changes
Test Programs: List test programs
Put in Release Notes: Yes/No?
Module(s): Module Names change impacts.
Description: Describe your changes here...
Rewrite implementations for locator and interpolator.
Documentation (doxygen format) is added to header files.
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File size:
1.3 KB
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Line | |
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1 | // |
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2 | // C++ Implementation: BufferedLinearInterpolator1D |
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3 | // |
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4 | // Description: |
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5 | // |
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6 | // |
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7 | // Author: Takeshi Nakazato <takeshi.nakazato@nao.ac.jp>, (C) 2012 |
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8 | // |
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9 | // Copyright: See COPYING file that comes with this distribution |
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10 | // |
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11 | // |
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12 | #include <assert.h> |
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13 | |
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14 | #include "BufferedLinearInterpolator1D.h" |
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15 | |
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16 | namespace asap { |
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17 | |
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18 | BufferedLinearInterpolator1D::BufferedLinearInterpolator1D() |
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19 | : Interpolator1D(), |
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20 | reusable_(false) |
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21 | {} |
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22 | |
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23 | BufferedLinearInterpolator1D::~BufferedLinearInterpolator1D() |
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24 | {} |
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25 | |
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26 | void BufferedLinearInterpolator1D::setData(double *x, float *y, unsigned int n) |
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27 | { |
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28 | Interpolator1D::setData(x, y, n); |
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29 | reusable_ = false; |
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30 | } |
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31 | |
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32 | void BufferedLinearInterpolator1D::setX(double *x, unsigned int n) |
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33 | { |
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34 | Interpolator1D::setX(x, n); |
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35 | reusable_ = false; |
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36 | } |
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37 | |
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38 | float BufferedLinearInterpolator1D::interpolate(double x) |
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39 | { |
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40 | assert(isready()); |
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41 | if (n_ == 1) |
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42 | return y_[0]; |
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43 | |
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44 | unsigned int i; |
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45 | bool b = (reusable_ && x == xold_); |
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46 | if (b) { |
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47 | i = prev_; |
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48 | } |
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49 | else { |
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50 | i = locator_->locate(x); |
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51 | prev_ = i; |
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52 | xold_ = x; |
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53 | } |
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54 | |
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55 | // do not perform extrapolation |
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56 | if (i == 0) { |
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57 | return y_[i]; |
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58 | } |
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59 | else if (i == n_) { |
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60 | return y_[i-1]; |
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61 | } |
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62 | |
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63 | // linear interpolation |
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64 | if (!b) |
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65 | factor_ = (x - x_[i-1]) / (x_[i] - x_[i-1]); |
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66 | float y = y_[i-1] + (y_[i] - y_[i-1]) * factor_; |
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67 | reusable_ = true; |
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68 | return y; |
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69 | } |
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70 | |
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71 | } |
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