[yt-users] 1D Profile standard deviation

[Nathan Goldbaum]

Hi Stephanie,

The `standard_deviation` attribute was added late during the 3.4
development cycle, in May. You say you're running 3.4-dev, so it's possible
you're running a version from before we added that. See:

https://github.com/yt-project/yt/pull/1372

If you update yt to version 3.4.0 (the current stable release) or update to
the latest development version of yt (3.5dev) the issue you're running into
should go away.

-Nathan

On Thu, Nov 2, 2017 at 8:30 PM, Stephanie Tonnesen <stonnes at gmail.com>
wrote:

> Hi yt-users!
>
> I am trying to make a profile plot of the standard deviation of the gas
> density of a galaxy for a few outputs.  I *think* I am closely following
> the cookbook example:
>
> http://yt-project.org/doc/cookbook/simple_plots.html?
> highlight=profileplot%20standard%20deviation
>
> but am getting an error:
>
> AttributeError: 'Profile1D' object has no attribute 'standard_deviation'
>
> Here is a code snippet, and I will attach the whole ugly script in case I
> missed anything that someone needs to see (ignore the strange indents
> below, cut and paste does not love me):
>
> ds = yt.load("/data001/stonnes/"+loopfile[i]+"/DD"+loop[i]+"/"+
> loopfile[i]+loop[i])
>     disk1 = ds.disk([0.5,0.5,0.5],[0,0,-1.0],(40,"kpc"),(2,"kpc"))
>     disk = disk1.cut_region(["obj['Metal_Density']/obj['density'] >
> 0.05"])
>
>     prof = yt.create_profile(disk,
>     'radius',('gas','density'),
>     n_bins=52,
>     units={'radius':'kpc'},
>     weight_field='ones',
>     extrema={'radius':((0.0,'kpc'),(40.0,'kpc'))},
>     )
>
>     radius = prof.x
>     mean = prof['gas','density']
>     std = prof.standard_deviation['gas','density']
>     plt.semilogy(radius,mean,color=cols[i],linewidth=lw[i],
> linestyle=linest[i],label=looptext[i])
>     plt.ylim(1e-27,1e-21)
>     plt.xlabel('r (kpc)')
>     plt.ylabel(r'density (g/cm$^3$)')
>     plt.legend()
>
> I am using yt version 3.4-dev, and the line that gets the error is:
>
> std = prof.standard_deviation['gas','density']
>
> Any help is much appreciated!  Thanks,
> Stephanie
> --
> Dr. Stephanie Tonnesen
> Associate Research Scientist
> CCA, Flatiron Institute
> New York, NY
>
> stonnes at gmail.com
>
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>
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