DetermineChunking v1

../_images/DetermineChunking-v1_dlg.png

DetermineChunking dialog.

Summary

Workflow algorithm to determine chunking strategy for event nexus, runinfo.xml, raw, or histo nexus files.

Properties

Name Direction Type Default Description
Filename Input string Mandatory The name of the event nexus, runinfo.xml, raw, or histo nexus file to read, including its full or relative path. The Event NeXus file name is typically of the form INST_####_event.nxs (N.B. case sensitive if running on Linux). Allowed extensions: [‘.nxs’, ‘.nxs.h5’, ‘.raw’, ‘_event.nxs’, ‘_histo.nxs’, ‘_runinfo.xml’]
MaxChunkSize Input number Optional Get chunking strategy for chunks with this number of Gbytes. File will not be loaded if this option is set.
OutputWorkspace Output TableWorkspace Mandatory An output workspace.

Description

Workflow algorithm to determine chunking strategy for event nexus, runinfo.xml, raw, or histo nexus files

Usage

Example

ws=DetermineChunking("CNCS_7860_event.nxs",MaxChunkSize=0.0005)
print("A max chunck size of 0.0005 created {} chunks.".format(ws.rowCount()))

#The algorithm can also use the SNS runinfo.xml file
ws2=DetermineChunking("CNCS_7860_runinfo.xml",MaxChunkSize=0.0010)
print("A max chunck size of 0.0010 created {} chunks.".format(ws2.rowCount()))

Output:

A max chunck size of 0.0005 created 11 chunks.
A max chunck size of 0.0010 created 6 chunks.

Categories: AlgorithmIndex | DataHandling\PreNexus | Workflow\DataHandling

Source

C++ source: DetermineChunking.cpp (last modified: 2019-06-05)

C++ header: DetermineChunking.h (last modified: 2018-10-05)