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ReflectometrySliceEventWorkspace v1

Summary

Split an input workspace into multiple slices according to time or log values

See Also

GenerateEventsFilter, FilterEvents, ReflectometryReductionOneAuto

Properties

Name	Direction	Type	Default	Description
InputWorkspace	Input	MatrixWorkspace	Mandatory	An input Matrix workspace.
StartTime	Input	string		The start time, such that all events before this time are filtered out: it could be (1) relative time to run start time in unit as specified property ‘UnitOfTime’ (2) absolute time Absolute time takes a string in format as 1990-01-01T00:00:00, while the relative time takes a string representing an integer or a floating-point number.
StopTime	Input	string		The stop time, such that all events after this time are filtered out: it could be (1) relative time to run start time in unit as specified property ‘UnitOfTime’ (2) absolute time Absolute time takes a string in format as 1990-01-01T00:00:00, while the relative time takes a string representing an integer or a floating-point number.
TimeInterval	Input	dbl list		Array for lengths of time intervals for splitters: if the array is empty, then there will be one splitter created from StartTime and StopTime; if the array has one value, then if this value is positive, all splitters will have same time intervals, else the time intervals will be exponentially increasing; if the size of the array is larger than one, then the splitters can have various time interval values.
LogName	Input	string		Name of the sample log to use to filter - for example, the pulse charge is recorded in ‘ProtonCharge’.
MinimumLogValue	Input	number	Optional	Minimum log value for which to keep events.
MaximumLogValue	Input	number	Optional	Maximum log value for which to keep events.
LogValueInterval	Input	number	Optional	Delta of log value to be sliced into from min log value and max log value; if not given, then only value
LogBoundary	Input	string	Centre	How to treat log values as being measured in the centre of time. There are three options, ‘Centre’, ‘Left’ and ‘Other’. This value must be set to Left if the sample log is recorded upon changing,which applies to most of the sample environment devices in SNS. Allowed values: [‘Centre’, ‘Left’, ‘Other’]
LogValueTolerance	Input	number	Optional	Tolerance of the log value to be included in filter, used in the case to filter by multiple values.
MonitorWorkspace	Input	MatrixWorkspace	Mandatory	Input monitor workspace
OutputWorkspace	Output	WorkspaceGroup	Mandatory	Group name for the output workspace(s).
UseNewFilterAlgorithm	Input	boolean	True	If true, use the new FilterEvents algorithm instead of FilterByTime.

ReflectometrySliceEventWorkspace

This algorithm slices an input workspace into one or more grouped output workspaces based on input filtering properties.

It uses GenerateEventsFilter v1 to define the way splitting should be done and exposes the relevant input properties for that algorithm. It then performs the filtering using FilterEvents v1.

The sliced workspaces are then rebinned to histogram data and combined with the given monitor workspace, to produce a workspace suitable for input to ReflectometryReductionOneAuto v3. The monitors for each slice are scaled according to the percentage of proton_charge in that slice.

Usage

Example: slice by time interval

input_ws = CreateSampleWorkspace("Event",BankPixelWidth=1,BinWidth=20000)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:00:00", Value=100)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:10:00", Value=100)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:20:00", Value=80)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:30:00", Value=80)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:40:00", Value=15)
AddTimeSeriesLog(input_ws, Name="proton_charge", Time="2010-01-01T00:50:00", Value=100)
monitor_ws = CreateSampleWorkspace(NumBanks=0, NumMonitors=3, BankPixelWidth=1, NumEvents=10000)

output = ReflectometrySliceEventWorkspace(InputWorkspace=input_ws, MonitorWorkspace=monitor_ws,
                                          TimeInterval=600, StartTime='1800', StopTime='3300')

print(str(output.getNumberOfEntries()) + ' slices')
print(str(output[0].getNumberHistograms()) + ' spectra')
print('Y values for first bin:')
for i in range(output.getNumberOfEntries()):
    print('Slice '  + str(i))
    for j in range(output[i].getNumberHistograms()):
        print('{:.8f}'.format(output[i].dataY(j)[0]))

Output:

3 slices
5 spectra
Y values for first bin:
Slice 0
0.05052632
0.05052632
0.05052632
4.00000000
4.00000000
Slice 1
0.00947368
0.00947368
0.00947368
4.00000000
4.00000000
Slice 2
0.06315789
0.06315789
0.06315789
1.00000000
1.00000000

Categories: AlgorithmIndex | Reflectometry

Source

Python: ReflectometrySliceEventWorkspace.py