DecoupAsymPowderMagRot.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2021 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin
// SPDX - License - Identifier: GPL - 3.0 +
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidCurveFitting/Functions/DecoupAsymPowderMagRot.h"
#include "MantidAPI/FunctionFactory.h"
#include "MantidCurveFitting/MuonHelpers.h"
 
#include <cmath>
 
namespace Mantid::CurveFitting::Functions {
 
using namespace CurveFitting;
 
using namespace Kernel;
 
using namespace API;
 
using namespace CurveFitting::MuonHelper;
 
DECLARE_FUNCTION(DecoupAsymPowderMagRot)
 
void DecoupAsymPowderMagRot::init() {
  declareParameter("Asymmetry", 1.0, "a scaling parameter for the overall asymmetry");
  declareParameter("CharField", 1.0, "the characteristic field");
}
 
void DecoupAsymPowderMagRot::function1D(double *out, const double *xValues, const size_t nData) const {
  const double asym = getParameter("Asymmetry");
  const double charField = getParameter("CharField");
 
  for (size_t i = 0; i < nData; i++) {
    auto A_z = getAz(xValues[i], charField);
    out[i] = asym * (1 - A_z);
  }
}
 
void DecoupAsymPowderMagRot::functionDeriv1D(Jacobian *out, const double *xValues, const size_t nData) {
  const double charField = getParameter("CharField");
 
  for (size_t i = 0; i < nData; i++) {
    double diffasym = 1 - getAz(xValues[i], charField);
    double diffAz = getDiffAz(xValues[i], charField);
    if (!std::isfinite(diffasym)) {
      diffasym = 0.0;
    }
    out->set(i, 0, diffasym);
    out->set(i, 1, diffAz);
  }
}
} // namespace Mantid::CurveFitting::Functions