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MaskDetectorsIf v1

Summary

Masks detectors depending on the values in the input workspace.

See Also

MaskDetectors

Properties

Name	Direction	Type	Default	Description
InputWorkspace	Input	MatrixWorkspace	Mandatory	A 1D Workspace that contains values to select against
Mode	Input	string	SelectIf	Mode to select or deselect detectors based on comparison with values. Allowed values: [‘SelectIf’, ‘DeselectIf’]
Operator	Input	string	Equal	Operator to compare to given values. Allowed values: [‘Equal’, ‘NotEqual’, ‘Greater’, ‘GreaterEqual’, ‘Less’, ‘LessEqual’, ‘NotFinite’]
Value	Input	number	0
InputCalFile	Input	string		The name of the CalFile with grouping data. Allowed extensions: [‘.cal’]
OutputCalFile	Input	string		The name of the CalFile with grouping data. Allowed extensions: [‘.cal’]
OutputWorkspace	Output	MatrixWorkspace		The masked workspace.

Description

Iterates over the input workspace evaluating the test for each bin in each spectrum, and will select (or deselect) it is any of the bins match the test. There are two output modes:

Output to a calfile

For this mode the properties InputCalFile and OutputCalFile have to be set. If the detectors should be masked it deselects all of the contributing detectors in the output calfile. All other aspects of the InputCalFile are copied over to the OutputCalFile.

Output to a workspace

For this mode the OutputWorkspace property has to be set. The algorithm masks the selected detectors (Mode='SelectIf') or unmasks deselected ones (Mode='DeselectIf') for the output workspace. Masking will clear the data in the spectra under question. Unmasking will just clear the masking flag but will not restore the data.

Note

If you select the NotFinite operator, the value property is ignored. This operator finds values that are infinite or NaN.

Usage

Example - mask spectra whose integral is below some limit

ws = CreateSampleWorkspace()
# One spectrum has lower counts than the rest
badIndex = 3
Ys = ws.dataY(badIndex)
Ys *= 0.01
integral = Integration(ws)
MaskDetectorsIf(integral, Operator='Less', Value=10., OutputWorkspace=integral)
MaskDetectors(ws, MaskedWorkspace=integral)
# Inspect the result
isMasked = ws.spectrumInfo().isMasked(badIndex)
print('Spectrum at index {} is masked? {}'.format(badIndex, isMasked))

Output:

Spectrum at index 3 is masked? True

Categories: AlgorithmIndex | Diffraction\Masking | Transforms\Masking

Source

C++ header: MaskDetectorsIf.h

C++ source: MaskDetectorsIf.cpp