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SaveCanSAS1D v2¶

Summary ¶

Save a MatrixWorkspace to a file in the CanSAS1D XML format (for 1D data).

Properties ¶

Name	Direction	Type	Default	Description
InputWorkspace	Input	MatrixWorkspace	Mandatory	The input workspace, which must be in units of Q. Must be a 1D workspace.
Filename	Input	string	Mandatory	The name of the xml file to save. Allowed extensions: [‘.xml’]
RadiationSource	Input	string	Spallation Neutron Source	The type of radiation used. Allowed values: [‘Spallation Neutron Source’, ‘Pulsed Reactor Neutron Source’, ‘Reactor Neutron Source’, ‘Synchrotron X-ray Source’, ‘Pulsed Muon Source’, ‘Rotating Anode X-ray’, ‘Fixed Tube X-ray’, ‘neutron’, ‘x-ray’, ‘muon’, ‘electron’]
Append	Input	boolean	False	Selecting append allows the workspace to be added to an existing canSAS 1-D file as a new SASentry
Process	Input	string		Text to append to Process section
DetectorNames	Input	string		Specify in a comma separated list, which detectors to store information about; where each name must match a name given for a detector in the [[IDF\|instrument definition file (IDF)]]. IDFs are located in the instrument sub-directory of the Mantid install directory.
Geometry	Input	string	Unknown	The geometry type of the collimation. Allowed values: [‘Cylinder’, ‘FlatPlate’, ‘Flat plate’, ‘Disc’, ‘Unknown’]
SampleHeight	Input	number	0	The height of the collimation element in mm. If specified as 0 it will not be recorded.
SampleWidth	Input	number	0	The width of the collimation element in mm. If specified as 0 it will not be recorded.
SampleThickness	Input	number	0	The thickness of the sample in mm. If specified as 0 it will not be recorded.
Transmission	Input	MatrixWorkspace		The transmission workspace. Optional. If given, will be saved at TransmissionSpectrum
TransmissionCan	Input	MatrixWorkspace		The transmission workspace of the Can. Optional. If given, will be saved at TransmissionSpectrum
SampleTransmissionRunNumber	Input	string		The run number for the sample transmission workspace. Optional.
SampleDirectRunNumber	Input	string		The run number for the sample direct workspace. Optional.
CanScatterRunNumber	Input	string		The run number for the can scatter workspace. Optional.
CanDirectRunNumber	Input	string		The run number for the can direct workspace. Optional.
OneSpectrumPerFile	Input	boolean	False	If true, each spectrum will be saved in an invididual file
BackgroundSubtractionWorkspace	Input	string		The name of the workspace used in the scaled background subtraction, to be included in the metadata. Optional.
BackgroundSubtractionScaleFactor	Input	number	0	The scale factor used in the scaled background subtraction, to be included in the metadata. Optional.

Description ¶

Saves the given Matrix Workspace to a file in the CanSAS1D XML format.

This format is only intended to be used for 1D workspaces.

If the workspace contains several spectra, two options are available:

if OneSpectrumPerFile is false (default value), all spectra will be appended into the same file (into different <SASdata> entries)
if OneSpectrumPerFile is true, each spectrum will be written in a separate file. The name of the file will be created as follows:

<Filename property>_<spectrum index>_<axis value><axis unit>.<extension>

The created file can be loaded back into Mantid using the LoadCanSAS1D v2 algorithm.

The canSAS 1-D Format ¶

The canSAS 1-D standard for reduced 1-D SAS data is implemented using XML files. A single file can contain SAS data from a single experiment or multiple experiments.

Version 1.1 of the canSAS 1-D schema can be used to validate files of this format.

There is a canSAS Wiki available which provides more information about the format.

Versions ¶

This is version 2 of the algorithm, which meets version 1.1 of the canSAS 1-D specification.

You can export data to files using version 1.0 of the specification by using version 1 of SaveCanSAS1D.

Usage ¶

Example - Save/Load “Roundtrip”

import os

# Create dummy workspace.
dataX = [0,1,2,3]
dataY = [9,5,7]
out_ws = CreateWorkspace(dataX, dataY, UnitX="MomentumTransfer")

file_path = os.path.join(config["defaultsave.directory"], "canSASData.xml")

# Do a "roundtrip" of the data.
SaveCanSAS1D(out_ws, file_path)
in_ws = LoadCanSAS1D(file_path)

print("Contents of the file = " + str(in_ws.readY(0)) + ".")

Output:

Contents of the file = [ 9.  5.  7.].

Categories: AlgorithmIndex | DataHandling\XML | SANS\DataHandling

Source ¶

C++ header: SaveCanSAS1D2.h

C++ source: SaveCanSAS1D2.cpp