refs #13517. Working serial algorithm.

Code/Mantid/Framework/DataObjects/inc/MantidDataObjects/MDHistoWorkspace.h

@@ -371,6 +371,8 @@ public:
 
   /// Apply masking.
   void setMDMasking(Mantid::Geometry::MDImplicitFunction *maskingRegion);
+  /// Apply masking.
+  void setMDMaskAt(const size_t& index, bool mask);
 
   /// Clear masking.
   void clearMDMasking();

Code/Mantid/Framework/DataObjects/src/MDHistoWorkspace.cpp

@@ -1165,6 +1165,15 @@ void MDHistoWorkspace::setMDMasking(
   }
 }
 
+/**
+ * Set the masking
+ * @param index : linear index to mask
+ * @param mask : True to mask. False to clear.
+ */
+void MDHistoWorkspace::setMDMaskAt(const size_t& index, bool mask){
+    m_masks[index] = mask;
+}
+
 /// Clear any existing masking.
 void MDHistoWorkspace::clearMDMasking() {
   for (size_t i = 0; i < this->getNPoints(); ++i) {

Code/Mantid/Framework/MDAlgorithms/src/TransposeMD.cpp

@@ -106,15 +106,13 @@ void TransposeMD::exec() {
   }
 
 
-  std::vector<coord_t> origin;
+  std::vector<coord_t> origin(nDimsOutput, 0.0);
   std::vector<Geometry::IMDDimension_sptr> targetGeometry;
   for (size_t i = 0; i < nDimsOutput; ++i) {
     // Clone the dimension corresponding to the axis requested.
     auto cloneDim = Geometry::IMDDimension_sptr(
         new Geometry::MDHistoDimension(inWS->getDimension(axes[i]).get()));
     targetGeometry.push_back(cloneDim);
-    // Set the same origin as we have on the input workspace
-    origin.push_back(coord_t(cloneDim->getMinimum()));
   }
 
   // Make the output workspace in the right shape.
@@ -134,8 +132,10 @@ void TransposeMD::exec() {
 
       size_t index = outWS->getLinearIndexAtCoord(&outcoords[0]);
       outWS->setSignalAt(index, inIterator->getSignal());
-      outWS->setErrorSquaredAt(index, inIterator->getError()*inIterator->getError());
-      // TODO more otherwise
+      const double error = inIterator->getError();
+      outWS->setErrorSquaredAt(index, error*error);
+      outWS->setNumEventsAt(index, inIterator->getNumEvents());
+      outWS->setMDMaskAt(index, inIterator->getIsMasked());
 
   }while(inIterator->next());