[yt-users] Derivative Error

[Nathan Butcher]

Hello,

The images are the same as before. I will try to create a simpler test case
to check this field and see if it behaves properly. Thank you for all of
the help.

Nathan

On Thu, Jun 14, 2012 at 1:44 PM, Matthew Turk <matthewturk at gmail.com> wrote:

> Hi Nathan,
>
> How are you centering the slice?  This looks somewhat like a
> difference in the centering.  Can you try something like:
>
> pc = PlotCollection(pf, 'c')
> pc.add_slice("GravGradient", "x")
> pc.save()
>
> for both the old and new, and see if they look similar?
>
> -Matt
>
> On Thu, Jun 14, 2012 at 1:41 PM, Nathan Butcher <butchernate at gmail.com>
> wrote:
> > The colorbar scaling is similar, and the values have changed. It could
> be a
> > large shift. It is hard for me to tell from the plot. I have attached the
> > updated plot.
> >
> > Nathan
> >
> >
> > On Thu, Jun 14, 2012 at 1:32 PM, Matthew Turk <matthewturk at gmail.com>
> wrote:
> >>
> >> On Thu, Jun 14, 2012 at 1:31 PM, Nathan Butcher <butchernate at gmail.com>
> >> wrote:
> >> > Hello Matt,
> >> >
> >> > Thanks, that seems to have done fixed the issue. I am seeing that the
> >> > graph
> >> > looks very different now compared to before. Would forgetting the
> extra
> >> > zone
> >> > change the appearance of the overall plot beyond edge effects?
> >>
> >> It should shift the derivative considerably, but the only other
> >> differences should be at the edges.  Are the actual values different,
> >> or is the colorbar scaling differently now?
> >>
> >> >
> >> > Thank you,
> >> > Nathan Butcher
> >> >
> >> >
> >> > On Thu, Jun 14, 2012 at 1:21 PM, Matthew Turk <matthewturk at gmail.com>
> >> > wrote:
> >> >>
> >> >> Hi Nathan,
> >> >>
> >> >> Yup, I agree with your assessment -- there's an edge effect.  You
> need
> >> >> one more thing to get the derivative field working; you need to tell
> >> >> yt to give you an extra zone in each direction.  You can do that by
> >> >> changing your decorator for the derived field to:
> >> >>
> >> >> @derived_field(name = "GravGradientX", validators =
> >> >> [ValidateSpatial(1)])
> >> >>
> >> >> I don't believe you need any additional changes inside the source
> >> >> code.  Let us know if that fixes it!
> >> >>
> >> >> -Matt
> >> >>
> >> >> On Thu, Jun 14, 2012 at 1:14 PM, Nathan Butcher <
> butchernate at gmail.com>
> >> >> wrote:
> >> >> > Hello,
> >> >> >
> >> >> > Using an Enzo dataset, I have written a function to find the
> >> >> > derivative
> >> >> > in
> >> >> > the x-direction of a field. When I try to plot the derivative, I
> see
> >> >> > lines
> >> >> > that throughout the plot that I'm guessing are due to the edges of
> >> >> > cells.
> >> >> > The attached plot is a slice of the x-direction derivative of the
> >> >> > PotentialField viewed down the x-axis, but this error appears in
> >> >> > plots
> >> >> > for
> >> >> > density and pressure as well. I am new to using yt, and I am not
> sure
> >> >> > what
> >> >> > is causing this.
> >> >> >
> >> >> > Thank you,
> >> >> > Nathan Butcher
> >> >> >
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> >> >> >
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