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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

## Description¶

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.

### Time series data¶

TimeSeriesProperty data within the workspace will be saved as NXlog sections in the Nexus file. Only floating point logs are stored and loaded at present.

### Child Algorithms used¶

SaveNexusProcessed v1

## Usage¶

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)


Categories: AlgorithmIndex | DataHandling\Nexus