[yt-users] Strange Behaviour in ProjectionPlot
Nathan Goldbaum
nathan12343 at gmail.com
Mon Nov 12 10:38:37 PST 2012
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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