Re: [yt-users] Log scale

Just wanted to point out that the potential field has a gauge freedom that lets you add a constant, so you can always make it positive. Greg On Jun 9, 2011, at 11:39 AM, Matthew Turk wrote:

Hi Elizabeth,

I think Sam's right, the onyl way to make your entire potential field positive is to scale it with the Extrema. But if you just want to change the linear to log scaling, use p.set_log_field(True).

-Matt

On Thu, Jun 9, 2011 at 8:05 AM, Sam Skillman wrote:

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Hi Elizabeth, You should be able to create a derived field (http://yt.enzotools.org/doc/advanced/creating_derived_quantities.html ) that is not negative and then it should show up as logarithmic. Maybe make an PotentialFieldMagnitude quantity using the absolute magnitude or something similar. You may need to specify the take_log=True keyword in the add_quantity call, but True should be the default keyword argument. Sam On Thu, Jun 9, 2011 at 10:57 AM, Elizabeth Tasker

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wrote:

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Hi,

I'm doing slices of the potential field:

p = pc.add_slice("PotentialField", 2) pc.set_width(10, 'kpc') p.set_zlim(-4500,-2500) p.modify["grids"]()

Is there a way to force the scale to the logarithmic like for density slices?

thanks,

Elizabeth _______________________________________________ yt-users mailing list yt-users@lists.spacepope.org http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org

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