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

[Nathan Goldbaum]

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.

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<javascript:_e(%7B%7D,'cvml','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
>>>>
>>>
>>> _______________________________________________
>>> yt-users mailing list
>>> yt-users at lists.spacepope.org
>>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>>
>>>
>>
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