[yt-users] phase plots

[Matthew Turk]

Hi all,

I added this to trunk.  There's now a "ComovingDensity" and a
"Comoving_HI_Density" (for all species, not just HI) field spec.

-Matt

On Sun, Feb 21, 2010 at 10:00 AM, Britton Smith <brittonsmith at gmail.com> wrote:
> 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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