Problem with ConvertToMD powder mode.

[Alex Buts]

Run script:

#################################################
# ConvertToMD bug #
#################################################
root=os.path.dirname(os.path.realpath(__file__))
config.appendDataSearchDir(root)
config['defaultsave.directory']=root
source_file = 'MAP05935_ei34.nxspe'
mat_ws = 'MAP05935'
target = 'MAP05935_QdE'
if not mat_ws in mtd:
    Load(Filename=source_file, OutputWorkspace=mat_ws)
   
if not target in mtd:
    SofQW(InputWorkspace=mat_ws, OutputWorkspace=target, QAxisBinning='0,0.02,5', EMode='Direct')
plotSlice(target)

targetMD= target+'_MD'
ConvertToMD(InputWorkspace=mat_ws, QDimensions='|Q|', OutputWorkspace=targetMD, OverwriteExisting=True, SplitInto='200,80',\
PreprocDetectorsWS='PreprocessedDetectorsWS',MinValues='0,-5',MaxValues='5,20')
plotSlice(targetMD)

With the data can be found at ​ftp://ftp.nd.rl.ac.uk/scratch/abuts/Ticket_11695/

When results produced by SofQW1 look correct (bar normalization), ConvertToMD produces huge gap in q-dE space. See the picture attached.

[Andrei Savici]

One must rebin the data in slice viewer. The problem occurs because the event workspace is not a regular grid, and when a large number of events is in a box, that box is subdivided. With the large split numbers in the script, it is likely that user just cannot see the small boxes.

[Stuart Campbell]

This ticket has been transferred to github issue ​12533