[yt-users] Strange Behaviour in ProjectionPlot

[Patrick Rieser]

Ah damn, now I feel stupid. I should have realized that. I will try it 
tomorrow, but yes, that should fix it!

Thanks a lot!

Best wishes,
Patrick

Am 12.11.2012 19:38, schrieb Nathan Goldbaum:
> If Britton is correct (and looking closely at your script, I suspect 
> he is) you'll likely fix the issue by specifying the width of the 
> image in comoving units:
>
> pc.set_width((28,'mpccm'))
>
> Right now the plot axes will still choose to annotate the x and y axes 
> using physical units, even though the width of the image will be the 
> comoving width you requested.  Sorry for that bit of 
> nonintuitiveness.  Sam Skillman just filed a bug about this issue 
> which I will fix soon: 
> https://bitbucket.org/yt_analysis/yt/issue/463/plotwindow-axes-unit-defaults
>
> -Nathan
>
> On 11/12/12 10:25 AM, Britton Smith wrote:
>> Hi Patrick,
>>
>> Is this a cosmology simulation?  If so, I think the issue is that the 
>> window is in physical coordinates, which are increasing with time.
>>
>> Britton
>>
>>
>> On Mon, Nov 12, 2012 at 1:21 PM, Nathan Goldbaum 
>> <nathan12343 at gmail.com <mailto:nathan12343 at gmail.com>> wrote:
>>
>>     Hi Patrick,
>>
>>     I'm unable to reproduce the issue you're seeing.  I'm running the
>>     following script:
>>
>>     from yt.mods import * # set up our namespace
>>     from yt.analysis_modules.level_sets.api import *
>>
>>     pf = load("galaxy0030/galaxy0030")
>>
>>     master_clump = pf.h.load_object('My_Clumps')
>>
>>     all_clumps = get_lowest_clumps(master_clump)
>>
>>     for i in range(1,3):
>>
>>         prj = ProjectionPlot(pf,2,'Density',center='c')
>>
>>         prj.set_width((20,'kpc'))
>>
>>         slc.annotate_text([0.0,1.05], "Clump %s" % i)
>>
>>         slc.annotate_clumps([all_clumps[i]])
>>
>>         slc.save(str(i))
>>
>>     I've previously saved the clump objects in the file "My_clumps".
>>      I did this following Britton's recipe from the workshop:
>>
>> https://bitbucket.org/brittonsmith/yt.workshop2012.clump-finding/src/1e7af99cec95fb307bb79055f908d39a200b7091/scripts/find_clumps_and_save.py?at=default
>>
>>     When I run the script, I get the following two images:
>>
>>     http://i.imgur.com/MhkaQ.png
>>     http://i.imgur.com/ZGzTl.png
>>
>>     This script uses the IsolatedGalaxy dataset stored at
>>     yt-project.org/data <http://yt-project.org/data>
>>
>>     It would help me track down what's going wrong if you could come
>>     up with a somewhat simpler script that reproduces the error,
>>     preferably using one of the datasets on yt-project.org
>>     <http://yt-project.org>.  Please feel free to e-mail me in private
>>     or join us on irc so we can iterate on this.
>>
>>     Cheers,
>>
>>     Nathan
>>
>>
>>     On 11/12/12 9:50 AM, Patrick Rieser wrote:
>>
>>         Hey all,
>>
>>         So I still get some strange behaviour with the ProjectionPlot.
>>         If I use the projection.set_width() with the clumps callback
>>         method I get the real image shrinked inside the the plot
>>         window. Strange thing is, that it grows with each step! Here
>>         is a demonstration how it looks (you have to look closely as
>>         it doesn't grow that much each step):
>>
>> http://www.flickr.com/photos/87912862@N05/sets/72157631990474435/
>>
>>         If I don't use the set_width() then the image itself looks
>>         fine, but the scale on the axis grows with each step. So it
>>         seems to be the same error than with fixed width.
>>
>>
>>         Best wishes,
>>         Patrick
>>
>>
>>
>>         Here is the code that I am using:
>>
>>         # ID is just a list of tuples with clumps/their position in an
>>         array
>>         # sim_files and clump_files is a list containing the filenames
>>         # get_myclump() simply returns a specific clump
>>
>>         for j, series in enumerate(ID):
>>             for i in series:
>>                 pf = load(sim_files[i[0]])
>>                 myclump = get_myclump(clump_files[i[0]], i[1])
>>
>>                 pc = ProjectionPlot(pf, axis, my_field, center =
>>         pf.domain_center, weight_field = my_wfield)
>>                 pc.set_width(28, "mpc")
>>                 pc.annotate_text([0.0,1.05], "Clump %s" % j)
>>
>>                 if redshift:
>>                     pc.annotate_text([0.917,1.05], "z = %0.4f" %
>>         pf.current_redshift)
>>                 if grid:
>>                     pc.annotate_grids()
>>                 if fix_scale:
>> pc.set_zlim(my_field,boundaries[0],boundaries[1])
>>
>>                 pc.set_cmap("Density", "idl01")
>>                 pc.annotate_clumps(myclump)
>>
>> pc.save('%s/Clump_%s_File_%s_Nr_%s_%s_Projection.png'
>>         % (myBASEDIR, j, i[0], i[1], axis))
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