Quadratic.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidCurveFitting/Functions/Quadratic.h"
#include "MantidAPI/FunctionFactory.h"
 
namespace Mantid::CurveFitting::Functions {
 
using namespace CurveFitting;
 
using namespace Kernel;
 
using namespace API;
 
DECLARE_FUNCTION(Quadratic)
 
 
void Quadratic::init() {
  declareParameter("A0", 0.0, "coefficient for constant term");
  declareParameter("A1", 0.0, "coefficient for linear term");
  declareParameter("A2", 0.0, "coefficient for quadratic term");
}
 
void Quadratic::function1D(double *out, const double *xValues, const size_t nData) const {
  const double a0 = getParameter("A0");
  const double a1 = getParameter("A1");
  const double a2 = getParameter("A2");
 
  for (size_t i = 0; i < nData; i++) {
    out[i] = a0 + a1 * xValues[i] + a2 * xValues[i] * xValues[i];
  }
}
 
void Quadratic::functionDeriv1D(API::Jacobian *out, const double *xValues, const size_t nData) {
  for (size_t i = 0; i < nData; i++) {
    out->set(i, 0, 1);
    out->set(i, 1, xValues[i]);
    out->set(i, 2, xValues[i] * xValues[i]);
  }
}
 
} // namespace Mantid::CurveFitting::Functions