Lower dimensionality cuts for CutMD

[Owen Arnold]

This is a request from the inelastic group to run CutMD on the outputs of CutMD.

Important concepts in Mantid and Horace:

• Histograms are stand-alone. Often having a reference to the original workspace yields incorrect results. Russell describes Histograms as 'dead-ends'. However you can perform further work on a histogram workspace provided that slice orientations are axis aligned, the processing on any dimension leads to less resolution by integrating. So you can in-fact provide limited processing of MDHistogram workspaces provided that you follow these two rules.
• MDEventWorkspaces may be re-processed in

As a reminder NoPix is the option in CutMD that switches between these two types of Output.

Use case 1

md_4d = Load(Filename='TestSQW_LET.nxs',  LoaderName='LoadMD', LoaderVersion=1)
p = Projection([1,1,0], [-1,1,0], [0,0,1])
histo_2d = CutMD(InputWorkspace='hkl', P1Bin='-0.1,0.01,0.7', P2Bin='-0.7,0.01,0.5', P3Bin='-1,1',  P4Bin='0.1,0.2',Projection=p.createWorkspace('proj'), NoPix=True)

# Should be able to re-cut
histo_1d = CutMD(InputWorkspace=histo_2d, [-0.5,0.5], []) # Empty list means don't touch dimension. They stay the same as the original cut.

Use case 2. Same as above, but with full MDEvents

md_4d = Load(Filename='TestSQW_LET.nxs',  LoaderName='LoadMD', LoaderVersion=1)
p = Projection([1,1,0], [-1,1,0], [0,0,1])
md_2d = CutMD(InputWorkspace='hkl', P1Bin='-0.1,0.01,0.7', P2Bin='-0.7,0.01,0.5', P3Bin='-1,1',  P4Bin='0.1,0.2',Projection=p.createWorkspace('proj'), NoPix=False)

# Should be able to re-cut
md_1d = CutMD(InputWorkspace=md_2d, [-0.5,0.5], []) # Empty list means don't touch dimension. They stay the same as the original cut.

[Owen Arnold]

refs #11572. Use IntegrateMDHistoWorkspace.

Changeset: bb4f2fa88a800bba4f5ebbe0ab5bf38833d48eb9

[Owen Arnold]

refs #11572. Add usage example.

Changeset: 739cc9257a33d0e2859a5d74c9eef0d6901464b5

[Owen Arnold]

refs #11572. Use IntegrateMDHistoWorkspace.

Changeset: 77e57ad2aeacd22c4a838ac74def2b0a2d623135

[Owen Arnold]

refs #11572. Add usage example.

Changeset: 35cd88afc6c37615a4e722ea5bb457678d8b1366

[Owen Arnold]

refs #11572. Revert debug info.

Changeset: 672df7458a66d430f655d8500095ff5a49a1767b

[Owen Arnold]

This is being verified as ​pull request #644.

[Owen Arnold]

Use case 3 moved to #11627

[Harry Jeffery]

Merge pull request #644 from mantidproject/11572_cutmd

Lower dimensional cuts for CutMD

Full changeset: ​7cce96b07c0a9b57cfee4a3b2e20b26767e99c75

[Stuart Campbell]

This ticket has been transferred to github issue ​12410