[yt-users] Derivative Error

[Nathan Butcher]

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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