[yt-dev] Field Parameters Bug

[Cameron Hummels]

I like the option of just adding a "dimension" argument to when you
declare/add a field_parameter.  That retains the freedom of making your own
field_parameters, but seems to fix this dimensional problem.

Cameron

On Thu, Oct 2, 2014 at 5:36 AM, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi Hilary,
>
> Maybe we ought to have a registry of known field parameters,
> affiliated with dimensions.  A while back I looked at the known ones,
> and there were not many in use.  It might be relatively
> straightforward to set up a simple registry.  My concern is then that
> individuals wanting to define their own are going to run into an issue
> of the behavior changing, not knowing how to fix it, and so on.
>
> Alternately, we could use a default parameter in those failing fields.
> Or, we could add an argument to the add_field call of the dimensions
> of the field parameter.
>
> -Matt
>
> On Wed, Oct 1, 2014 at 3:22 PM, Hilary Egan <hilaryye at gmail.com> wrote:
> > Hi all,
> >
> > I've encountered a bug with this example in the docs of getting/setting
> > field parameters of a dataset for use in a derived field. The example
> works
> > fine for known yt field parameters like bulk_velocity, but if you change
> > every instance of "bulk_velocity" to "my_bulk_velocity" (sample script),
> > then it breaks with this error.
> >
> > It seems as though this breaks because `has_field_parameter` always
> returns
> > True, and there is no way to know ahead of time what units a user-defined
> > field parameter will take, so the mock field data can't be set up
> correctly.
> > Nathan suggested via IRC that this might necessitate creating a way to
> > register user-defined field parameters, but it's probably worth
> > brain-storming about if anyone else has any other suggestions!
> >
> > -Hilary
> >
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-- 
Cameron Hummels
Postdoctoral Researcher
Steward Observatory
University of Arizona
http://chummels.org
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