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SaveNexus v1¶

Summary ¶

The SaveNexus algorithm will write the given Mantid workspace to a NeXus file. SaveNexus currently just invokes SaveNexusProcessed.

Properties ¶

Name	Direction	Type	Default	Description
InputWorkspace	Input	Workspace	Mandatory	Name of the workspace to be saved
Filename	Input	string	Mandatory	The name of the Nexus file to write, as a full or relative path. Allowed extensions: [‘.nxs’, ‘.nx5’, ‘.xml’]
Title	Input	string		A title to describe the saved workspace
WorkspaceIndexMin	Input	number	0	Number of first WorkspaceIndex to read, only for single period data. Not yet implemented
WorkspaceIndexMax	Input	number	Optional	Number of last WorkspaceIndex to read, only for single period data. Not yet implemented.
WorkspaceIndexList	Input	int list		List of WorkspaceIndex numbers to read, only for single period data. Not yet implemented
Append	Input	boolean	False	Determines whether .nxs file needs to be over written or appended

The algorithm SaveNexus will write a Nexus data file from the named workspace. The file name can be an absolute or relative path and should have the extension .nxs, .nx5 or .xml. Warning - using XML format can be extremely slow for large data sets and generate very large files. Both the extensions nxs and nx5 will generate HDF5 files.

The optional parameters can be used to control which spectra are saved into the file (not yet implemented). If WorkspaceIndexMin and WorkspaceIndexMax are given, then only that range to data will be saved.

A Mantid Nexus file may contain several workspace entries each labelled with an integer starting at 1. If the file already contains n workspaces, the new one will be labelled n+1.

In the future it may be possible to write other Nexus file types than the one supported by SaveNexusProcessed.

import os
# Create a file path in the user home directory
filePath = os.path.expanduser('~/SavedNexusFile.nxs')

# Create a workspace
ws=CreateSampleWorkspace()
# Save it in Nexus format
SaveNexus(ws,filePath)