SaveNexus does not stores/reloads a workspace created by SofQW3

[Alex Buts]

Run script below from the folder where the test file resides twice. (you need Mantid 3.1 or nightly to do that, Mantid 3.2 will fail)

##################################################
##  Visualize 2D Matrix workspace                                                  ##
##################################################
root=os.path.dirname(os.path.realpath(__file__))
config.appendDataSearchDir(root)
config['defaultsave.directory']=root

# Load source file
rez_file = FileFinder.getFullPath('MAP05935MD.nxs')
if len(rez_file) == 0:
	Load(Filename='MAP05935_4to1_033.nxspe', OutputWorkspace='MAP05935', LoaderName='LoadNXSPE', LoaderVersion=1)
	#  Got Matrix workspace
	SofQW3(InputWorkspace='MAP05935', OutputWorkspace='MAP05935MD', QAxisBinning='0,0.02,3', EMode='Direct')
	SaveNexus(InputWorkspace='MAP05935', Filename='MAP05935MD.nxs')	
else:
	Load(Filename=rez_file, OutputWorkspace='MAP05935MD', LoaderName='LoadNexusProcessed', LoaderVersion=1)	
	
#Show the result as described at http://www.mantidproject.org/SliceViewer_Python_Interface
#plotSlice('MAP05935MD')
# Got 1D slice
Rebin2D(InputWorkspace='MAP05935MD', OutputWorkspace='MAP05935MD_line',\
Axis1Binning='-2.02692,0.187385,16.7115', Axis2Binning='1.26,0.102857,1.36286', UseFractionalArea=True)

First time it works fine while second time it fails on Rebin and workspace itself looks ugly.

The test file referred by the script with the whole script version can be found on ​ftp://ftp.nd.rl.ac.uk/scratch/abuts/Ticket_10055 but actually any inelastic direct mode nxspe file should do.

The problem is incorrect saving/loading of the binning data

[Michael Reuter]

Your script has an error in it. The SaveNexus call should be:

SaveNexus(InputWorkspace='MAP05935MD', Filename='MAP05935MD.nxs')

otherwise you are just saving the NXSPE data and not the SQW data. The NXSPE data won't work in Rebin2D well. :-) With the script fixed, redoing the Rebin2D over and over shows the same plot.

[Alex Buts]

Correct resolution, so I am removing testing files from the ftp server

[Stuart Campbell]

This ticket has been transferred to github issue ​10897