Experimental Physics and
Industrial Control System

Pete Jemian <[email protected]> · Wed, 9 May 2018 08:00:53 -0500

When not using the EPICS Area Detector HDF5 File Writing Plugin to write

area detector data into a NeXus file, our USAXS instrument uses custom

Python code and the h5py package to write NeXus files.

On 2018-05-09 7:22 AM, Matt Newville wrote:

 From python, nexpy (https://github.com/nexpy/nexpy) is very useful for

working with nexus data, either from plain python programs, or from its

very nice GUI.  You can also sort of "roll your own" by using HDF5 + the

nexus conventions.  That's probably not "recommended", but it can work

in a pinch.

The NeXus International Advisory Committee advises to use the NAPI

support library when writing NeXus data files. But when the NIAC

members were asked who among them uses the NAPI, the response was less

than half. Thus, there are code examples for NAPI and non-NAPI file

writers here:

http://download.nexusformat.org/doc/html/examples/index.html#code-examples-that-use-the-nexus-api-napi

For Python, see this page:

http://download.nexusformat.org/doc/html/examples/h5py/index.html

Use any software you wish to write a NeXus HDF5 data file. The

documentation is the "NeXus: User Manual"

(http://download.nexusformat.org/doc/html/user_manual.html).

There are programs to check if a given data file passes validation. See

this page for the list from NeXus:

http://download.nexusformat.org/doc/html/validation.html As its author,

I suggest you try the punx program if you wish to validate your data files.

--
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Pete R. Jemian, Ph.D.                 <[email protected]>
Beam line Controls and Data Acquisition (BC, aka BCDA)
Advanced Photon Source,    Argonne National Laboratory
Argonne, IL  60439                    630 - 252 - 3189
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System