[yt-users] Radial Velocity Projection

[Matthew Turk]

Hi John,

The easiest thing to do is to probably set the field parameters on a data
container, and the supply that as a data_source to the projection.

-Matt

On Tue, Nov 25, 2014, 3:27 AM John Regan <johnanthonyregan at gmail.com> wrote:

> Hi All,
>
> I need to set the "center" field parameter for making a projection of the
> "radial_velocity".
> I see from the docs how to do that for a data container but its not clear
> what to do for a
> projection.
>
> The error I am getting at the moment when the "center" is not set is:
>
> File
> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/data_containers.py",
> line 249, in __getitem__
>     self.get_data(f)
>   File
> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/data_objects/data_containers.py",
> line 656, in get_data
>     finfo.check_available(self)
>   File
> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/fields/derived_field.py",
> line 146, in check_available
>     validator(data)
>   File
> "/homeappl/home/regan/appl_taito/YT/Dev-3.0/yt/yt/fields/derived_field.py",
> line 235, in __call__
>     raise NeedsParameter(doesnt_have)
> yt.fields.field_exceptions.NeedsParameter: (['center'])
>
> Any tips much appreciated!
>
>
> Cheers,
> John
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