[Nexus] making link under different name in Python

Andras WACHA wacha.andras at ttk.mta.hu
Mon Nov 4 08:49:35 GMT 2013

Dear Carlos,

thank you for your help

Best regards,


On Hét, November 4, 2013 9:28 am, Carlos Pascual wrote:
> I asked this same thing to the nexus-development list in August 2012...
> IMHO, a keyword argument (e.g. "name") should be added to
> NXgroup.makelink()
> As a workaround, you can use the makenamedlink() method from the NeXus
> file object of the nap (but beware, because it is sometimes tricky to mix
> the NXTree API with the NAPI).
> As an example on how I dealt with the named links using the NAPI, you
> can see the BaseNEXUS_FileRecorder._nxln() method in line 476 of this
> file:
> https://sourceforge.net/p/sardana/sardana.git/ci/master/tree/src/sardana/macroserver/scan/recorder/storage.py#l476
> On Fri 1 November 2013 12:07:47 Andras WACHA wrote:
>> Dear NeXus devs and users,
>> I am currently implementing NeXus as a data storage system for our new
>> laboratory SAXS instrument. The control software is written in
>> Python, and I would like to use the NeXusTree API for saving HDF-5
>> files.
>> We have one main 2D detector, which is saved to
>> NXentry/NXinstrument/detector:NXdetector. However, for scan
>> measurements we use several "virtual" detectors, which are defined as
>> operations on the images of the main detector, e.g. sum, maximum,
>> barycenter etc. I would like to implement these as auxiliary
>> detectors, e.g. in
>> NXentry/NXinstrument/max:NXdetector etc. However, to comply with the
>> base class specifications -- and to have the same structure of all
>> these virtual detectors -- I would prefer to use the 'data' field in
>> each group to hold the NP data points, and create links into
>> NXentry/NXdata for each dataset. However, here I would like to use
>> the name of the virtual detector (e.g. max, sum, total etc.), which I
>> found I cannot do either with nxs.NXdata.makelink() or using
>> nxs.NXdata.max=nxs.NXlink(target=...) -like constructs.
>> How should one proceed in such cases? Or should I do things otherwise?
>> Best regards,
>> Andras Wacha
> --
> +----------------------------------------------------+
>  Carlos Pascual Izarra
>  Scientific Software Coordinator
>  Computing Division
>  Cells / Alba Synchrotron  [http:/www.cells.es]
>  Carretera BP 1413 de Cerdanyola-Sant Cugat, Km. 3.3
>  E-08290 Cerdanyola del Valles (Barcelona), Spain
>  E-mail: cpascual at cells.es
>  Phone: +34 93 592 4428
> +----------------------------------------------------+
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