[Nexus] Correct way to specify multiple signals

Osborn, Raymond rosborn at anl.gov
Sat Jan 20 13:23:37 GMT 2018

Hi Armando,
I had no problem opening the file with the nexusformat API. It’s already been very helpful in focusing my thinking on the subject. If we restrict the auxiliary signals to having a common axis, then I think something like this could be workable.

It turns out that overplotting multiple signals was a bit more cumbersome than I would have liked in NeXpy, so at the very least, I will be modifying my code to make it easier with this kind of data.

Have a good weekend,

On Jan 20, 2018, at 6:58 AM, V. Armando Sole <sole at esrf.fr<mailto:sole at esrf.fr>> wrote:

If you have troubles with previous file, you can try this one:


As I said, it is a work in progress (I find some differences between Python2 and Python3 when generating the file)


On 20.01.2018 13:31, V. Armando Sole wrote:
Dear colleagues,
It has been a difficult week and I am still working on it, but you can
download a tentative example (still needs improvements) for one of the
acquisition use cases I foresee (the link will expire at the end of
the month):
As I said, one of our objectives is that the end user can recover as
default plot the plot shown during the acquisition. For those using
SPEC, the idea is to be able to map the plotselect to the NeXus file.
Those scans correspond to energy scans with a multielement detector
and the goal is to visualize the contents of all the Ni Ka ROIs
corresponding to what the user was interested on during the
The intention is to have the signal in the NXdata group corresponding
to the central element and the auxiliary_signals to the rest of
As I said, it is still a work in progress but I hope you get the idea.
Hopefully next week I can provide example and viewer.
See you,
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NeXus mailing list
NeXus at nexusformat.org

Ray Osborn, Senior Scientist
Materials Science Division
Argonne National Laboratory
Argonne, IL 60439, USA
Phone: +1 (630) 252-9011
Email: ROsborn at anl.gov<mailto:ROsborn at anl.gov>

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