[yt-users] Field existence check

[Matthew Turk]

Hi Dave,

You should be able to do this by looking at the "field_list" property
of the hierarchy object.

i.e.,

pf = load("my_data")
if not "DavesField" in pf.h.field_list:
    add_field(...)

Hope that helps!

-Matt

On Wed, May 27, 2009 at 2:45 PM, david collins <antpuncher at gmail.com> wrote:
> Hi--
>
> I have a derived quantity that I only write to disk in some
> simulations.  Is there a way to check for the existence of a field in
> the data set, so that if it doesn't exist I can derive it?
>
> Thanks,
> d.
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