C++ NXData::openNXFloat方法代码示例

    /**
    * Load a given period into the workspace
    * @param period :: The period number to load (starting from 1) 
    * @param entry :: The opened root entry node for accessing the monitor and data nodes
    * @param local_workspace :: The workspace to place the data in
    */
    void LoadISISNexus2::loadPeriodData(int64_t period, NXEntry & entry, DataObjects::Workspace2D_sptr local_workspace)
    {
      int64_t hist_index = 0;
      int64_t period_index(period - 1);
      int64_t first_monitor_spectrum = 0;

      if( !m_monitors.empty() )
      {
        first_monitor_spectrum = m_monitors.begin()->first;
        hist_index = first_monitor_spectrum - 1;
        for(std::map<int64_t,std::string>::const_iterator it = m_monitors.begin();
          it != m_monitors.end(); ++it)
        {
          NXData monitor = entry.openNXData(it->second);
          NXInt mondata = monitor.openIntData();
          m_progress->report("Loading monitor");
          mondata.load(1,static_cast<int>(period-1)); // TODO this is just wrong
          MantidVec& Y = local_workspace->dataY(hist_index);
          Y.assign(mondata(),mondata() + m_numberOfChannels);
          MantidVec& E = local_workspace->dataE(hist_index);
          std::transform(Y.begin(), Y.end(), E.begin(), dblSqrt);
          local_workspace->getAxis(1)->spectraNo(hist_index) = static_cast<specid_t>(it->first);

          NXFloat timeBins = monitor.openNXFloat("time_of_flight");
          timeBins.load();
          local_workspace->dataX(hist_index).assign(timeBins(),timeBins() + timeBins.dim0());
          hist_index++;
        }

        if (first_monitor_spectrum > 1)
        {
          hist_index = 0;
        }
      }
      
      if( m_have_detector )
      {
        NXData nxdata = entry.openNXData("detector_1");
        NXDataSetTyped<int> data = nxdata.openIntData();
        data.open();
        //Start with thelist members that are lower than the required spectrum
        const int * const spec_begin = m_spec.get();
        std::vector<int64_t>::iterator min_end = m_spec_list.end();
        if( !m_spec_list.empty() )
        {
          // If we have a list, by now it is ordered so first pull in the range below the starting block range
          // Note the reverse iteration as we want the last one
          if( m_range_supplied )
          {
            min_end = std::find_if(m_spec_list.begin(), m_spec_list.end(), std::bind2nd(std::greater<int>(), m_spec_min));
          }

          for( std::vector<int64_t>::iterator itr = m_spec_list.begin(); itr < min_end; ++itr )
          {
            // Load each
            int64_t spectra_no = (*itr);
            // For this to work correctly, we assume that the spectrum list increases monotonically
            int64_t filestart = std::lower_bound(spec_begin,m_spec_end,spectra_no) - spec_begin;
            m_progress->report("Loading data");
            loadBlock(data, static_cast<int64_t>(1), period_index, filestart, hist_index, spectra_no, local_workspace);
          }
        }    

        if( m_range_supplied )
        {
          // When reading in blocks we need to be careful that the range is exactly divisible by the blocksize
          // and if not have an extra read of the left overs
          const int64_t blocksize = 8;
          const int64_t rangesize = (m_spec_max - m_spec_min + 1) - m_monitors.size();
          const int64_t fullblocks = rangesize / blocksize;
          int64_t read_stop = 0;
          int64_t spectra_no = m_spec_min;
          if (first_monitor_spectrum == 1)
          {// this if crudely checks whether the monitors are at the begining or end of the spectra
            spectra_no += static_cast<int>(m_monitors.size());
          }
          // For this to work correctly, we assume that the spectrum list increases monotonically
          int64_t filestart = std::lower_bound(spec_begin,m_spec_end,spectra_no) - spec_begin;
          if( fullblocks > 0 )
          {
            read_stop = (fullblocks * blocksize);// + m_monitors.size(); //RNT: I think monitors are excluded from the data
            //for( ; hist_index < read_stop; )
            for(int64_t i = 0; i < fullblocks; ++i)
            {
              loadBlock(data, blocksize, period_index, filestart, hist_index, spectra_no, local_workspace);
              filestart += blocksize;
            }
          }
          int64_t finalblock = rangesize - (fullblocks * blocksize);
          if( finalblock > 0 )
          {
            loadBlock(data, finalblock, period_index, filestart, hist_index, spectra_no,  local_workspace);
          }
        }
//.........这里部分代码省略.........

/** Load the event_workspace field
 *
 * @param wksp_cls
 * @param progressStart
 * @param progressRange
 * @return
 */
API::MatrixWorkspace_sptr LoadNexusProcessed::loadEventEntry(NXData & wksp_cls, NXDouble & xbins,
    const double& progressStart, const double& progressRange)
{
  NXDataSetTyped<int64_t> indices_data = wksp_cls.openNXDataSet<int64_t>("indices");
  indices_data.load();
  boost::shared_array<int64_t> indices = indices_data.sharedBuffer();
  int numspec = indices_data.dim0()-1;

  int num_xbins = xbins.dim0();
  if (num_xbins < 2) num_xbins = 2;
  EventWorkspace_sptr ws = boost::dynamic_pointer_cast<EventWorkspace>
  (WorkspaceFactory::Instance().create("EventWorkspace", numspec, num_xbins, num_xbins-1));

  // Set the YUnit label
  ws->setYUnit(indices_data.attributes("units"));
  std::string unitLabel = indices_data.attributes("unit_label");
  if (unitLabel.empty()) unitLabel = indices_data.attributes("units");
  ws->setYUnitLabel(unitLabel);

  //Handle optional fields.
  // TODO: Handle inconsistent sizes
  boost::shared_array<int64_t> pulsetimes;
  if (wksp_cls.isValid("pulsetime"))
  {
    NXDataSetTyped<int64_t> pulsetime = wksp_cls.openNXDataSet<int64_t>("pulsetime");
    pulsetime.load();
    pulsetimes = pulsetime.sharedBuffer();
  }

  boost::shared_array<double> tofs;
  if (wksp_cls.isValid("tof"))
  {
    NXDouble tof = wksp_cls.openNXDouble("tof");
    tof.load();
    tofs = tof.sharedBuffer();
  }

  boost::shared_array<float> error_squareds;
  if (wksp_cls.isValid("error_squared"))
  {
    NXFloat error_squared = wksp_cls.openNXFloat("error_squared");
    error_squared.load();
    error_squareds = error_squared.sharedBuffer();
  }

  boost::shared_array<float> weights;
  if (wksp_cls.isValid("weight"))
  {
    NXFloat weight = wksp_cls.openNXFloat("weight");
    weight.load();
    weights = weight.sharedBuffer();
  }

  // What type of event lists?
  EventType type = TOF;
  if (tofs && pulsetimes && weights && error_squareds)
    type = WEIGHTED;
  else if ((tofs && weights && error_squareds))
    type = WEIGHTED_NOTIME;
  else if (pulsetimes && tofs)
    type = TOF;
  else
    throw std::runtime_error("Could not figure out the type of event list!");

  // Create all the event lists
  PARALLEL_FOR_NO_WSP_CHECK()
  for (int wi=0; wi < numspec; wi++)
  {
    PARALLEL_START_INTERUPT_REGION
    int64_t index_start = indices[wi];
    int64_t index_end = indices[wi+1];
    if (index_end >= index_start)
    {
      EventList & el = ws->getEventList(wi);
      el.switchTo(type);

      // Allocate all the required memory
      el.reserve(index_end - index_start);
      el.clearDetectorIDs();

      for (long i=index_start; i<index_end; i++)
      switch (type)
      {
      case TOF:
        el.addEventQuickly( TofEvent( tofs[i], DateAndTime(pulsetimes[i])) );
        break;
      case WEIGHTED:
        el.addEventQuickly( WeightedEvent( tofs[i], DateAndTime(pulsetimes[i]), weights[i], error_squareds[i]) );
        break;
      case WEIGHTED_NOTIME:
        el.addEventQuickly( WeightedEventNoTime( tofs[i], weights[i], error_squareds[i]) );
        break;
      }
//.........这里部分代码省略.........

/**
* Load a given period into the workspace
* @param period :: The period number to load (starting from 1)
* @param entry :: The opened root entry node for accessing the monitor and data
* nodes
* @param local_workspace :: The workspace to place the data in
* @param update_spectra2det_mapping :: reset spectra-detector map to the one
* calculated earlier. (Warning! -- this map has to be calculated correctly!)
*/
void
LoadISISNexus2::loadPeriodData(int64_t period, NXEntry &entry,
                               DataObjects::Workspace2D_sptr &local_workspace,
                               bool update_spectra2det_mapping) {
  int64_t hist_index = 0;
  int64_t period_index(period - 1);
  // int64_t first_monitor_spectrum = 0;

  for (auto block = m_spectraBlocks.begin(); block != m_spectraBlocks.end();
       ++block) {
    if (block->isMonitor) {
      NXData monitor = entry.openNXData(block->monName);
      NXInt mondata = monitor.openIntData();
      m_progress->report("Loading monitor");
      mondata.load(1, static_cast<int>(period - 1)); // TODO this is just wrong
      MantidVec &Y = local_workspace->dataY(hist_index);
      Y.assign(mondata(), mondata() + m_monBlockInfo.numberOfChannels);
      MantidVec &E = local_workspace->dataE(hist_index);
      std::transform(Y.begin(), Y.end(), E.begin(), dblSqrt);

      if (update_spectra2det_mapping) {
        // local_workspace->getAxis(1)->setValue(hist_index,
        // static_cast<specid_t>(it->first));
        auto spec = local_workspace->getSpectrum(hist_index);
        specid_t specID = m_specInd2specNum_map.at(hist_index);
        spec->setDetectorIDs(
            m_spec2det_map.getDetectorIDsForSpectrumNo(specID));
        spec->setSpectrumNo(specID);
      }

      NXFloat timeBins = monitor.openNXFloat("time_of_flight");
      timeBins.load();
      local_workspace->dataX(hist_index)
          .assign(timeBins(), timeBins() + timeBins.dim0());
      hist_index++;
    } else if (m_have_detector) {
      NXData nxdata = entry.openNXData("detector_1");
      NXDataSetTyped<int> data = nxdata.openIntData();
      data.open();
      // Start with the list members that are lower than the required spectrum
      const int *const spec_begin = m_spec.get();
      // When reading in blocks we need to be careful that the range is exactly
      // divisible by the block-size
      // and if not have an extra read of the left overs
      const int64_t blocksize = 8;
      const int64_t rangesize = block->last - block->first + 1;
      const int64_t fullblocks = rangesize / blocksize;
      int64_t spectra_no = block->first;

      // For this to work correctly, we assume that the spectrum list increases
      // monotonically
      int64_t filestart =
          std::lower_bound(spec_begin, m_spec_end, spectra_no) - spec_begin;
      if (fullblocks > 0) {
        for (int64_t i = 0; i < fullblocks; ++i) {
          loadBlock(data, blocksize, period_index, filestart, hist_index,
                    spectra_no, local_workspace);
          filestart += blocksize;
        }
      }
      int64_t finalblock = rangesize - (fullblocks * blocksize);
      if (finalblock > 0) {
        loadBlock(data, finalblock, period_index, filestart, hist_index,
                  spectra_no, local_workspace);
      }
    }
  }

  try {
    const std::string title = entry.getString("title");
    local_workspace->setTitle(title);
    // write the title into the log file (run object)
    local_workspace->mutableRun().addProperty("run_title", title, true);
  } catch (std::runtime_error &) {
    g_log.debug() << "No title was found in the input file, "
                  << getPropertyValue("Filename") << std::endl;
  }
}