spline.cpp

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#include "spline.h"
 
namespace sablib {
 
//
// Implementation of BaselineSpline() function
//
const std::vector<double> BaselineSpline(const std::vector<double> & y, const std::vector<unsigned int> & indices)
{
    if(y.size() == 0 || indices.size() == 0) {
        throw std::invalid_argument("BaselineSpline(): the length of y or indices is zero.");
    }
 
    if(y.size() < indices.size()) {
        throw std::invalid_argument("BaselineSpline(): the length of indices is larger than y.");
    }
 
    double max_index = y.size() - 1;
    Eigen::VectorXd xx(indices.size()), yy(indices.size());
 
    for(unsigned int i = 0; i < indices.size(); i++) {
        xx(i) = indices[i] / max_index;
        yy(i) = y[indices[i]];
    }
 
    CubicSpline spline(xx, yy);
    std::vector<double> result = y;
 
    for(unsigned int i = indices[0]; i < indices.back(); i++) {
        result[i] = spline.Interpolate(i / max_index);
    }
 
    return result;
}
 
}; // namespace sablib