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CompareMDWorkspaces v1¶

Summary ¶

Compare two MDWorkspaces for equality.

Properties ¶

Name	Direction	Type	Default	Description
Workspace1	Input	IMDWorkspace	Mandatory	First MDWorkspace to compare.
Workspace2	Input	IMDWorkspace	Mandatory	Second MDWorkspace to compare.
Tolerance	Input	number	0	The maximum amount by which values may differ between the workspaces.
MDEventTolerance	Input	number	1e-07	The maximum amount by which values may differ between 2 MDEvents to compare.
CheckEvents	Input	boolean	True	Whether to compare each MDEvent. If False, will only look at the box structure.
Equals	Output	boolean		Boolean set to true if the workspaces match.
Result	Output	string		String describing the difference found between the workspaces
IgnoreBoxID	Input	boolean	False	To ignore box ID-s when comparing MD boxes as Multithreaded splitting assigns box id-s randomly

Description ¶

Compare two MDWorkspaces (MDEventWorkspace or MDHistoWorkspace) to see if they are the same. This is mostly meant for testing/debugging use by developers.

What is compared: The dimensions, as well as the signal and error for each bin of each workspace will be compared.

MDEventWorkspace : the events in each box will be compared if the CheckEvents option is checked. The events would need to be in the same order to match.

Usage ¶

Example - compare two MD workspaces:

# create sample inelastic workspace for MARI instrument containing 1 at all spectra
ws1=CreateSimulationWorkspace(Instrument='MAR',BinParams='-10,1,10',UnitX='DeltaE')
AddSampleLog(ws1,'Ei','12.','Number')
# create the copy of first workspace
ws1a=ws1
# create second workspace which has different signals
ws2=ws1*2;
# Convert to MD
mdWs1 =ConvertToMD(InputWorkspace=ws1,QDimensions='|Q|',QConversionScales='Q in A^-1',SplitInto='100,100',MaxRecursionDepth='1')
mdWs1a=ConvertToMD(InputWorkspace=ws1a,QDimensions='|Q|',QConversionScales='Q in A^-1',SplitInto='100,100',MaxRecursionDepth='1')
mdWs2=ConvertToMD(InputWorkspace=ws2,QDimensions='|Q|',QConversionScales='Q in A^-1',SplitInto='100,100',MaxRecursionDepth='1')
# compare the workspaces
comp_rez1=CompareMDWorkspaces(mdWs1,mdWs1a)
comp_rez2=CompareMDWorkspaces(mdWs1,mdWs2)

# print comparison results
print("Workspaces mdWs1 and mdWs1a are equal? : {0}  : Comparison result: {1}".format(comp_rez1[0], comp_rez1[1]))
if comp_rez2[1].count('Box signal does not match (18360 vs 36720)') == 1:
    result = 'Box signal does not match (18360 vs 36720)'
else:
    result = comp_rez2[1]
print("Workspaces mdWs1 and mdWs2  are equal? : {0} : Comparison result: {1}".format(comp_rez2[0], result))

Output:

Workspaces mdWs1 and mdWs1a are equal? : True  : Comparison result: Success!
Workspaces mdWs1 and mdWs2  are equal? : False : Comparison result: Box signal does not match (18360 vs 36720)

Categories: AlgorithmIndex | MDAlgorithms\Utility\Workspaces