[yt-users] projection results

[Matthew Turk]

Hi Geoffrey,

On Mon, Jun 11, 2012 at 4:10 PM, Geoffrey So <gsiisg at gmail.com> wrote:
> Hi, sorry for asking a dumb question, but when I do a projection of density
>
> field = "Density"
> proj = pf.h.proj(direction, field, weight_field=field)
>
> the numbers I get are ~1e-28
>
> but when I do
> proj = pf.h.proj(direction, field, weight_field=None)
>
> the numbers become ~1e-4
>
> this is a 64 cube simulation, if I were to multiply 64 * 1e-28 for a
> projection with no weighting, shouldn't I still get numbers on the order of
> 1e-26 or 1e-27?  I'm guessing there's something I've misunderstood about
> pf.h.proj.  Am I missing like a CGS conversion factor when I don't weight it
> by some field?

Nope, weighting means to take the average with respect to some other
field.  So when you don't weight it, you don't take an average, you
get a line integral.  It's probably different by a factor of roughly
the same OOM as the number of centimeters your box is across.

-Matt

>
> From
> G.S.
>
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