On Wed, Jul 26, 2017 at 10:07 AM, Marianne Corvellec <marianne.corvellec@gmail.com> wrote:

Dear community,

Back in March, I started a thread with the same subject on the
Discussion list [1].

As recommended in the guidelines [2], I'm dropping you a line to let
you know that I have started working on a netcdf frontend.

I'm pushing the work in progress on a feature branch of my fork [3].

I'm about to load the input file with `netCDF4.Dataset()` in
`data_structures.py` and I'll use the length and time units as parsed
from the metadata.

There is no mass unit though. Is there any way to mark it as 'not
applicable'? Setting the mass unit to `None` currently leads to an
error.

Apologies for not replying, this message ended up in my spam folder for some reason.

No, we currently require you to supply mass units.

Are there really no quantities with units of mass or density in your data? If so then just leaving the mass unit as a dummy value should work.

Can you explain a little bit more why it doesn't make sense to define a mass unit for your data?

I thought that the default `_particle_reader = False` in `io.py` would
let you not consider particles and masses...

Happy to continue the conversation on Slack!

Thank you,
Marianne

[1] http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2017-March/thread.html
[2] http://yt-project.org/doc/developing/creating_frontend.html#data-meaning-structures
[3] https://github.com/mkcor/yt/tree/netcdf-autoloader/yt/frontends/netcdf
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