MergeMDEW: Algorithm to merge many MDEventWorkspaces

[mantid-builder]

Original Reporter: @jzikovsky

Original Owner: @jzikovsky

This ticket is blocked by :

• TRAC3571
• TRAC3605
• TRAC3661

Need a method for merging a large number of MDEventWorkspaces together WITHOUT EXPLODING MEMORY! This mostly for inelastic people wanting to add together N runs at N small rotations.

I think the way to go is:

• Generate a MDEventWorkspaces NXS file for each run with a fixed box structure.
  • This would be a MaxDepth=1 structure but with finer boxes, maybe 50x50x50.
  • This can be done immediately after acquiring each run so that less processing has to be done at once
• Supply a list of all the filenames to merge
  • What's the GUI possibilities for this? Would be nice to select a bunch of files.
• Go through each BOX to sum up a small part of the events from EACH file, and dump these into a large (file-backed) MDEventWorkspace that CAN split however is best.

[mantid-builder]

This issue was originally trac ticket 3557

[mantid-builder]

http://trac.mantidproject.org/mantid/raw-attachment/ticket/3557/MergeMD.py
(uploaded by @OwenArnold on 2011-09-21T15:26:38)

---