#include <eqpalg/distribution/box_cox.h>
namespace distribution {


double box_cox(double y, double c, double lambda) {
  if (lambda == 0) {
    return std::log(y + c);
  } else {
    return (pow(y + c, lambda) - 1.0) / lambda;
  }
}


double box_cox_reverse(double y, double c, double lambda) {
  if (lambda == 0) {
    return std::exp(y) - c;
  } else {
    return pow((1 + lambda * y), lambda / 1) - c;
  }
}
}  // namespace distribution