[2727] | 1 | // |
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| 2 | // C++ Interface: CubicSplineInterpolator1D |
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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 | #ifndef ASAP_CUBIC_SPLINE_INTERPOLATOR_1D_H |
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| 13 | #define ASAP_CUBIC_SPLINE_INTERPOLATOR_1D_H |
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| 14 | |
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| 15 | #include "Interpolator1D.h" |
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| 16 | |
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| 17 | namespace asap { |
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| 18 | |
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| 19 | /** |
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[2730] | 20 | * Implementation of (natural) cubic spline interpolation. |
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[2727] | 21 | * @author TakeshiNakazato |
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| 22 | */ |
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| 23 | class CubicSplineInterpolator1D : public Interpolator1D { |
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| 24 | public: |
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[2730] | 25 | // Default constructor. |
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[2727] | 26 | CubicSplineInterpolator1D(); |
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| 27 | |
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[2730] | 28 | // Destructor. |
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[2727] | 29 | virtual ~CubicSplineInterpolator1D(); |
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| 30 | |
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[2730] | 31 | // Override Interpolator1D::setData. |
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| 32 | // @see Interpolator1D::setData |
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| 33 | void setData(double *x, float *y, unsigned int n); |
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| 34 | |
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| 35 | // Override Interpolator1D::setY. |
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| 36 | // @see Interpolator1D::setY() |
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[2727] | 37 | void setY(float *y, unsigned int n); |
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[2730] | 38 | |
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| 39 | // Perform interpolation. |
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| 40 | // @param[in] x horizontal location where the value is evaluated |
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| 41 | // by interpolation. |
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| 42 | // @return interpolated value at x. |
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[2727] | 43 | float interpolate(double x); |
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| 44 | private: |
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[2730] | 45 | // Determine second derivatives of each point based on |
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| 46 | // natural cubic spline condition (second derivative at each |
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| 47 | // end is zero). |
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| 48 | void evaly2(); |
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[2727] | 49 | |
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[2730] | 50 | // Do interpolation using second derivatives determined by evaly2(). |
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| 51 | // @param[in] x horizontal location where the value is evaluated |
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| 52 | // by interpolation. |
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| 53 | // @param[in] i location index for x. |
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| 54 | // @return interpolated value at x. |
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| 55 | float dospline(double x, unsigned int i); |
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[2727] | 56 | |
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[2730] | 57 | // Array to store second derivatives on the data points. |
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[2727] | 58 | float *y2_; |
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[2730] | 59 | |
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| 60 | // number of data points for second derivatives |
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[2727] | 61 | unsigned int ny2_; |
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[2730] | 62 | |
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| 63 | // Boolean parameter whether buffered values are effective or not. |
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[2727] | 64 | bool reusable_; |
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| 65 | }; |
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| 66 | |
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| 67 | } |
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| 68 | #endif |
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