This lib is considered to be used as a sensor's calibration program. Calibration with Spline Interpolation might be useful in the case that you want some model expressing relationship such like between a value of physical quantity and your sensor's voltage, but you cannot estimate a model such as liner, square, cubic polynomial, or sine curve. This makes (Parametric) Cubic Spline Polynomial Model (Coefficients of the polynomial) from some sample plots(e.g. sets of (value, voltage)). The inverse function (x,y)->(y,x) has been implemented so as to get analog data (not stepping or leveled data).
Fork of TRP105F_Spline by
CubicSpline.h
- Committer:
- aktk
- Date:
- 2016-05-30
- Revision:
- 13:9a51747773af
- Parent:
- 9:1903c6f8d5a9
File content as of revision 13:9a51747773af:
/** * Spline_Cubic.h,.cpp * * Author: aktk, aktk.j.uec@gmail.com * Tokyo, Japan. * * LOG: * ver.0 2016/02.12 - 2016/02/16 * TRP105F_Spline.h,.cpp(Ver.2.1) * ver.1 2016/05.12 */ #ifndef Cubic_Spline_H #define Cubic_Spline_H #define DEBUG #define VERSION_C //#define DEBUG_MAKE_MODEL //#define DEBUG_SOLVE //#define DEBUG_GETX "DEBUG_GETX\n" //#define DEBUG_GETY "DEBUG_GETY\n" #include "mbed.h" #include <cmath> #include <complex> #include <vector> // Vector Element Type typedef struct { double x; // double y; // double t; // use as pramameter of x,y. } Vxyt; enum UseType { AsDEBUG, AsMODULE }; class CubicSpline2d { public: // Constraction CubicSpline2d(); CubicSpline2d(unsigned int); CubicSpline2d(unsigned int, UseType); // Destraction ~CubicSpline2d(); // Functions double getX(double arg_y); double getY(double arg_x); void calibrateSensor(); void saveSetting(); void saveSetting(const char *filename); void loadSetting(); void loadSetting(const char *filename); void printOutData(); private: // // Variables // UseType _useType; unsigned int _Sample_Num; // the number of samples for derive spline Vxyt* _Sample_Set; double* _C_x[4]; //x = Spline-f(t) = _C_x[0] + _C_x[1]t + _C_x[2]t^2 + _C_x[3]t^3 double* _C_y[4]; //y = Spline-f(t) = _C_y[0] + _C_y[1]t + _C_y[2]t^2 + _C_y[3]t^3 Vxyt _Last_Point; // // // // // For calibration // // sampling data for calibration void _sampleData(); // generate a vector of _u_params which is used for Cubic spline model void _makeModel( const double* arg_sampled_t, const double* arg_sampled_ft, /*-*/ double* arg_C[4], const unsigned int arg_num ); void _makeModel( const double* arg_sampled_t, const double* arg_sampled_ft, /*-*/ double* arg_C[4] ); // // For calculation // // Fuction to return the value of Cubic polynomial f(t) double _cubic_f( const double arg_t, const double arg_C[4] ); // Function to solve a cubic polinomial // by using Gardano-Tartaglia formula void _solve_cubic_f( std::complex<double>* arg_t, const double arg_C[4], const double arg_ft ); // // For debug // void _printOutData( const unsigned short* arg, const int num, const char* name); void _printOutData( const Vxyt* arg, const int num, const char* name); void _printOutData( const double* arg, const int num, const char* name); void _printOutDataCouple( const double* arg1, const double* arg2, const int num, const char* name); }; #endif