IFuncMinimizer.cpp

// 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
// SPDX - License - Identifier: GPL - 3.0 +
//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidAPI/IFuncMinimizer.h"

namespace Mantid {
namespace API {

/**
 * Do minimization of the set function.
 * @param maxIterations :: Maximum number of iterations.
 * @return :: true if successful, false otherwise. Call getError() to see the
 * error message string.
 */
bool IFuncMinimizer::minimize(size_t maxIterations) {
  m_errorString = ""; // iterate() may modify it
  size_t iter = 0;
  bool success = false;
  do {
    if (!iterate(iter)) {
      success = m_errorString.empty() || m_errorString == "success";
      if (success) {
        m_errorString = "success";
      }
      break;
    }
    iter++;
  } while (iter < maxIterations);

  if (iter >= maxIterations) {
    success = false;
    if (!m_errorString.empty()) {
      m_errorString += '\n';
    }
    m_errorString += "Failed to converge after " +
                     std::to_string(maxIterations) + " iterations.";
  }

  return success;
}

} // namespace API
} // namespace Mantid