[yt-users] Derivative Error

[Nathan Butcher]

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?

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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