[yt-users] phase plot CellVolume and CellVolumeCode

[Matthew Turk]

Hi Geoffrey,

By default, the phase plot takes the average and weighs that average
by the mass in a cell.  Both of your plots should have "weight=None"
in the argument list, so that the total of the third quantity
("CellMassMsun" and "CellVolumeCode", but I think for the second your
script must be different than what you copy/pasted) in each bin is
displayed, rather than the average.  For a unigrid simulation, the
average CellVolumeCode will be constant everywhere, and the average
Mass will increase with Density, as M = rho * V where V is a constant.

-Matt

On Tue, Feb 23, 2010 at 1:22 PM,  <gso at physics.ucsd.edu> wrote:
> When I tried the following:
> p = pc.add_phase_object(dd,
> ["Density","IonizationFraction","CellMassMsun"], lazy_reader = True)
>
> this gave me a phase plot of IonizationFraction vs Density, and the z axis
> colorbar shows a distribution of different masses, but if I used the
> following:
>
> p = pc.add_phase_object(dd,
> ["Density","CellVolumeCode","IonizationFraction"], lazy_reader = True)
>
> I get no distribution in the z colorbar at all.  The z values seem to be
> put into place but not accumulated when multiple y vs x have the same
> value.  Can anyone verify this behavior?  I was looking through the
> documentation
>
> http://yt.enzotools.org/doc/modules/plotting.html?highlight=phase#yt.raven.PlotCollection.add_profile_object
>
> but the "accumulation" parameter sets whether the y values are summed
> along x instead of the z colorbar.
>
> The plots are attached.
>
> From
> G.S.
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