[yt-users] Obtaining projection data value

[Jun-Hwan Choi]

Hi Matt,

Yes, you are correct.
I update the yt and it is now working.
Thank you.

Junhwan

Matthew Turk wrote:
>
> Hi Jun-has,
>
> Probably means you're on an older version. You can upgrade with "yt 
> update" or just use the manual interface to a FixedResolutionBuffer, 
> which is also documented.
>
> Matt
>
> On Feb 6, 2012 4:46 PM, "Jun-Hwan Choi" <jhchoi at pa.uky.edu 
> <mailto:jhchoi at pa.uky.edu>> wrote:
>
>     Hi Matthew,
>
>     I try the following script
>     from yt.mods import *
>     import matplotlib.pylab as pylab
>
>     # load up a dataset
>     index = 30
>     pf = load("DD%04d/DD%04d" % (index,index))
>     all_center = pf.h.find_max("Density")[1]
>     #sphere = pf.h.sphere(all_center, (50, 'pc'))
>     #sphere_center = sphere.quantities["CenterOfMass"]()
>
>     # create density slices   proj = pf.h.proj(2, 'Density')
>     width = 100/pf['pc']
>     res = [1000,1000]
>     frb = proj.to_frb(width, res, center=all_center)
>
>     pylab.imshow(frb['Density'])
>     pylab.xlabel(r'$x\ \mathrm{pc}$')
>     pylab.ylabel(r'$x\ \mathrm{furlongs}$')
>     pylab.savefig('my_perfect_figure.png')
>
>     and I got following error message:
>     frb = proj.to_frb(width, res, center=sphere_center)
>     AttributeError: 'AMRQuadTreeProj' object has no attribute 'to_frb'
>
>     What does error mean?
>
>     Thank you,
>     Junhwan
>     Matthew Turk wrote:
>
>         Hi Jun-Hwan,
>
>         On Mon, Feb 6, 2012 at 4:09 PM, Jun-Hwan Choi
>         <jhchoi at pa.uky.edu <mailto:jhchoi at pa.uky.edu>> wrote:
>          
>
>             Hi all,
>
>             I wonder whether that I can obtain the value that generate
>             projection plot.
>             I can make a projection image for my disk using
>             add_projection  in the
>             plot_collation.
>             I am interested in to get the projected density value and
>             its position (and
>             its pixel size) to perform the FFT analysis in order to
>             find the
>             non-axisymmertic feature such as disk-bar.
>             Is there way to get this values using yt?
>                
>
>
>         Yes.
>
>         http://yt-project.org/docs/2.3/visualizing/manual_plotting.html
>         http://yt-project.org/docs/2.3/analyzing/generating_processed_data.html#d-image-arrays
>
>         The function you're looking for is "to_frb" which is a method
>         on the
>         projection object.
>
>         pf = load(...)
>         proj = pf.h.proj(axis, field, weight)
>         frb = proj.to_frb()
>         field = frb[field]
>
>         -Matt
>
>          
>
>             Thank you in advance,
>             Junhwan
>
>             --
>             --------------------------------------------------------------
>             Jun-Hwan Choi, Ph.D.
>             Department of Physics and Astronomy, University of Kentucky
>             Tel: (859) 897-6737 <tel:%28859%29%20897-6737>        Fax:
>             (859) 323-2846 <tel:%28859%29%20323-2846>
>             Email: jhchoi at pa.uky.edu <mailto:jhchoi at pa.uky.edu>   URL:
>             http://www.pa.uky.edu/~jhchoi
>             <http://www.pa.uky.edu/%7Ejhchoi>
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>
>     -- 
>     --------------------------------------------------------------
>     Jun-Hwan Choi, Ph.D.
>     Department of Physics and Astronomy, University of Kentucky
>     Tel: (859) 897-6737 <tel:%28859%29%20897-6737>        Fax: (859)
>     323-2846 <tel:%28859%29%20323-2846>
>     Email: jhchoi at pa.uky.edu <mailto:jhchoi at pa.uky.edu>   URL:
>     http://www.pa.uky.edu/~jhchoi <http://www.pa.uky.edu/%7Ejhchoi>
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-- 
--------------------------------------------------------------
Jun-Hwan Choi, Ph.D.
Department of Physics and Astronomy, University of Kentucky
Tel: (859) 897-6737        Fax: (859) 323-2846
Email: jhchoi at pa.uky.edu   URL: http://www.pa.uky.edu/~jhchoi
--------------------------------------------------------------