[yt-users] phase plots

Britton Smith brittonsmith at gmail.com
Sun Feb 21 10:00:54 PST 2010


Can we just set up auto field generation for comoving density fields,
similar to the way the species fraction fields are set up?  For every
density field that exists, we can simply create Something_Density_Comoving,
or something similar.

Britton

On Sun, Feb 21, 2010 at 11:35 AM, Matthew Turk <matthewturk at gmail.com>wrote:

> Hi Geoffrey, Stephen,
>
> So there isn't currently a comoving density field.  I think it can be
> added like so:
>
> def _ComovingDensity(field, data):
>    ef = (1.0 + data.pf["CosmologyCurrentRedshift"])**3.0
>    return data["Density"]/ef
> add_field("ComovingDensity", function=_ComovingDensity)
>
> it won't need a conversion function because Density is already in CGS.
>
> Geoffrey, I think I'd prefer not to have a flag to swap things in and
> out -- globally turning on "comoving units" would likely end up having
> to add a lot of machinery to handle all of the comoving conversions.
> I think it's okay just to give them when requested.  (Which, for what
> it's worth, is what Enzo does in the parameter file output.)
>
> -Matt
>
> On Sun, Feb 21, 2010 at 3:13 AM,  <gso at physics.ucsd.edu> wrote:
> > Is it possible to leave the default in proper units, but add a new
> feature
> > using a flag that will set the data in either the co-moving, or proper
> > units?  (or is it much easier for the user to multiply it by the right
> > factors of 1+CurrentRedshift?)
> >
> > From
> > G.S.
> >
> >> Hi all,
> >>
> >> I would like to make a phase plot that uses co-moving density, rather
> than
> >> proper density, something like this:
> >>
> >> http://yt.enzotools.org/doc/cookbook/recipes.html#simple-phase
> >>
> >> do I have to define a new field, or is there a built-in comoving density
> >> field (that I can't find)?
> >>
> >> Thanks!
> >>  _______________________________________________________
> >> sskory at physics.ucsd.edu           o__  Stephen Skory
> >> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
> >> ________________________________(_)_\(_)_______________
> >>
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