[yt-users] log scale image for zero dynamic range

[Chang-Goo Kim]

Hi Nathan,




On Sun, May 18, 2014 at 2:17 AM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:

> Although it occurs to me that you might be able to work around this
> behavior by doing something like:
>
> slc = SlicePlot(ds, 'x', 'density')
> slc.set_zlim('density', 1e-4, 1e-0)
> slc.set_log('density', True)
>
> The key here is to call set_log after set_zlim.
>


As seen in the source code, this is exactly what I did. But, it didn't work.

Chang-Goo


>
> Just for some context: it is set up that way to avoid a crash in
> matplotlib which does not like creating logarithmic colorbars for data
> with zero dynamic range.
>
> Hope that's helpful,
>
> Nathan
>
> On Saturday, May 17, 2014, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>
>> Ah, thanks for the report - I replied hastily before getting on a
>> plane without looking at the source.
>>
>> I'll look at this tomorrow.
>>
>> Nathan
>>
>> On Saturday, May 17, 2014, Chang-Goo Kim <cgkim at astro.princeton.edu>
>> wrote:
>>
>>> Hi Nathan,
>>>
>>> I did set the limits explicitly, but yt switches colorer before it
>>> saves. See below for the link for my source code and the last part of error
>>> message.
>>>
>>> Chang-Goo
>>>
>>>
>>> http://paste.yt-project.org/show/4645/
>>>
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,766 Making a fixed resolution
>>> buffer of (('gas', 'pok')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,780 Making a fixed resolution
>>> buffer of (('athena', 'density')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,795 Making a fixed resolution
>>> buffer of (('gas', 'nH')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,810 Making a fixed resolution
>>> buffer of (('gas', 'density')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,825 Making a fixed resolution
>>> buffer of (('gas', 'temp')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,839 Making a fixed resolution
>>> buffer of (('athena', 'pressure')) 512 by 512
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:15,854 Making a fixed resolution
>>> buffer of (('gas', 'pressure')) 512 by 512
>>>
>>> yt : [WARNING  ] 2014-05-17 23:29:15,889 Plot image for field ('gas',
>>> 'nH') has zero dynamic range. Min = Max = 3.
>>>
>>> yt : [WARNING  ] 2014-05-17 23:29:15,889 Switching to linear colorbar
>>> scaling.
>>>
>>> yt : [WARNING  ] 2014-05-17 23:29:16,364 Plot image for field ('gas',
>>> 'nH') has zero dynamic range. Min = Max = 3.
>>>
>>> yt : [WARNING  ] 2014-05-17 23:29:16,364 Switching to linear colorbar
>>> scaling.
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:17,385 Saving plot
>>> /scratch/gpfs/changgoo/sntest_TI/png/n2_SN_dx2_L256_TE_multi_fm3/n2_SN_dx2_L256_TE_multi_fm3.0000_Slice_z_temp.png
>>>
>>> yt : [INFO     ] 2014-05-17 23:29:17,916 Saving plot
>>> /scratch/gpfs/changgoo/sntest_TI/png/n2_SN_dx2_L256_TE_multi_fm3/n2_SN_dx2_L256_TE_multi_fm3.0000_Slice_z_nH.png
>>>
>>>
>>>
>>>
>>> On Sat, May 17, 2014 at 7:50 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:
>>>
>>>> Hi Chang-Goo
>>>>
>>>> If you explicitly set the limits of the colorbar using the set_zlim
>>>> function you will avoid the zero dynamic range check.  That will also keep
>>>> the colorbar limits the same from frame to frame.
>>>>
>>>> Nathan
>>>>
>>>>
>>>> On Saturday, May 17, 2014, Chang-Goo Kim <cgkim at astro.princeton.edu>
>>>> wrote:
>>>>
>>>>> Hi all,
>>>>>
>>>>> When initial condition is uniform, it has zero dynamic range. Although
>>>>> it has no dynamic range, sometimes I need to plot it with log scale
>>>>> colorbar to make a movie with the same colorbar for later times. But, yt
>>>>> forced switch to linear colorbar. How can I make yt not to do that.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Chang-Goo
>>>>>
>>>>
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>>>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>>>
>>>>
>>>
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