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DivideMD.cpp
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DivideMD.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 +
#include "MantidMDAlgorithms/DivideMD.h"
#include "MantidDataObjects/MDBox.h"
#include "MantidDataObjects/MDBoxBase.h"
#include "MantidDataObjects/MDEventFactory.h"
#include "MantidDataObjects/MDEventWorkspace.h"
#include "MantidKernel/System.h"
using namespace Mantid::Kernel;
using namespace Mantid::API;
using namespace Mantid::DataObjects;
namespace Mantid::MDAlgorithms {
// Register the algorithm into the AlgorithmFactory
DECLARE_ALGORITHM(DivideMD)
//----------------------------------------------------------------------------------------------
/// Algorithm's name for identification. @see Algorithm::name
const std::string DivideMD::name() const { return "DivideMD"; }
/// Algorithm's version for identification. @see Algorithm::version
int DivideMD::version() const { return 1; }
//----------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------
/// Is the operation commutative?
bool DivideMD::commutative() const { return false; }
//----------------------------------------------------------------------------------------------
/// Check the inputs and throw if the algorithm cannot be run
void DivideMD::checkInputs() {
if (m_rhs_event)
throw std::runtime_error("Cannot divide by a MDEventWorkspace on the RHS.");
if (m_lhs_event && !m_rhs_scalar)
throw std::runtime_error("A MDEventWorkspace can only be divided by a scalar.");
}
//----------------------------------------------------------------------------------------------
/** Perform the operation with MDEventWorkpsace as LHS and a scalar as RHS
* Will do "ws /= scalar"
* @param ws :: MDEventWorkspace being modified
*/
template <typename MDE, size_t nd> void DivideMD::execEventScalar(typename MDEventWorkspace<MDE, nd>::sptr ws) {
// Get the scalar multiplying
auto scalar = float(m_rhs_scalar->y(0)[0]);
auto scalarError = float(m_rhs_scalar->e(0)[0]);
float scalarErrorSquared = scalarError * scalarError;
float inverseScalarSquared = 1.f / (scalar * scalar);
// Get all the MDBoxes contained
MDBoxBase<MDE, nd> *parentBox = ws->getBox();
std::vector<API::IMDNode *> boxes;
parentBox->getBoxes(boxes, 1000, true);
bool fileBackedTarget(false);
Kernel::DiskBuffer *dbuff(nullptr);
if (ws->isFileBacked()) {
fileBackedTarget = true;
dbuff = ws->getBoxController()->getFileIO();
}
for (auto &boxe : boxes) {
auto *box = dynamic_cast<MDBox<MDE, nd> *>(boxe);
if (box) {
size_t ic(0);
typename std::vector<MDE> &events = box->getEvents();
auto it = events.begin();
auto it_end = events.end();
for (; it != it_end; it++) {
// Multiply weight by a scalar, propagating error
float oldSignal = it->getSignal();
float signal = oldSignal / scalar;
float errorSquared = it->getErrorSquared() * inverseScalarSquared +
scalarErrorSquared * oldSignal * oldSignal * inverseScalarSquared * inverseScalarSquared;
it->setSignal(signal);
it->setErrorSquared(errorSquared);
ic++;
}
box->releaseEvents();
if (fileBackedTarget && ic > 0) {
Kernel::ISaveable *const pSaver(box->getISaveable());
dbuff->toWrite(pSaver);
}
}
}
// Recalculate the totals
ws->refreshCache();
// Mark file-backed workspace as dirty
ws->setFileNeedsUpdating(true);
}
//----------------------------------------------------------------------------------------------
/// Run the algorithm with an MDEventWorkspace as output
void DivideMD::execEvent() {
if (m_lhs_event && !m_rhs_scalar)
throw std::runtime_error("A MDEventWorkspace can only be divided by a scalar.");
if (!m_out_event)
throw std::runtime_error("DivideMD::execEvent(): Error creating output MDEventWorkspace.");
// Call the method to do the dividing
CALL_MDEVENT_FUNCTION(this->execEventScalar, m_out_event);
}
//----------------------------------------------------------------------------------------------
/// Run the algorithm with a MDHisotWorkspace as output and operand
void DivideMD::execHistoHisto(Mantid::DataObjects::MDHistoWorkspace_sptr out,
Mantid::DataObjects::MDHistoWorkspace_const_sptr operand) {
out->divide(*operand);
}
//----------------------------------------------------------------------------------------------
/// Run the algorithm with a MDHisotWorkspace as output, scalar and operand
void DivideMD::execHistoScalar(Mantid::DataObjects::MDHistoWorkspace_sptr out,
Mantid::DataObjects::WorkspaceSingleValue_const_sptr scalar) {
out->divide(scalar->y(0)[0], scalar->e(0)[0]);
}
} // namespace Mantid::MDAlgorithms