Re: [yt-users] phase plots

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 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 wrote:

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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,   wrote:

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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.

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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@physics.ucsd.edu           o__  Stephen Skory http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student ________________________________(_)_\(_)_______________

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