[yt-dev] axes units behaving correctly?

[Nathan Goldbaum]

On Thu, Oct 2, 2014 at 12:47 PM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

>
>
> On Thu, Oct 2, 2014 at 12:45 PM, Chris Malone <chris.m.malone at gmail.com>
> wrote:
>
>> So I should be interpreting code_* units as separate from whatever is set
>> as ds.length_unit, ds.time_unit, ds.mass_unit, etc.?
>>
>
> No, they're the same. It just doesn't automatically replace code_length
> with whatever ds.length_unit is.
>
>

Something I could get behind (although this would likely break a lot of
things) would be presenting Dataset attributes in physical units (i.e.
whatever ds.length_unit is).

Since we use Dataset attributes at the cython level, this would be a bit of
work to change, but I think it's doable.


>
>> On Thu, Oct 2, 2014 at 1:39 PM, Nathan Goldbaum <nathan12343 at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Thu, Oct 2, 2014 at 12:35 PM, Chris Malone <chris.m.malone at gmail.com>
>>> wrote:
>>>
>>>> Yup.  That one was screwy, and I had no idea what to think of it.
>>>> Filed here
>>>> https://bitbucket.org/yt_analysis/yt/issue/915/sliceplot-fails-with-odd-combination-of
>>>>
>>>> I'm trying to understand if the second plot is working as intended.
>>>> I'm happy to change my intuition about units, but I would like some
>>>> clarification.
>>>>
>>>>
>>> I think so, you specified that you wanted the width in code units, since
>>> domain_left_edge and domain_right_edge are in code units.  If you
>>> explicitly specify a width tuple it will make the plot in whichever units
>>> you specify.
>>>
>>>
>>>> On Thu, Oct 2, 2014 at 1:28 PM, Nathan Goldbaum <nathan12343 at gmail.com>
>>>> wrote:
>>>>
>>>>> That last plot looks like you're exposing a bug to me.  Can you file
>>>>> an issue?
>>>>>
>>>>> On Thu, Oct 2, 2014 at 12:26 PM, Chris Malone <
>>>>> chris.m.malone at gmail.com> wrote:
>>>>>
>>>>>> All,
>>>>>>
>>>>>> I'm seeing some behavior[1] with units of axes that seems
>>>>>> counter-intuitive, but maybe I need to change my intuition.
>>>>>>
>>>>>> In particular, if one makes a slice plot, but specifies the width of
>>>>>> the plot in units of 'code_length' - for example, from using
>>>>>> domain_right_edge - the units aren't properly converted to whatever was set
>>>>>> as `ds.length_unit`.  Is this working as intended?  Are users expected to
>>>>>> manually apply `.in_cgs()` to such items that have code_length?  Naively, I
>>>>>> would expect that when units are displayed, if they are code_* units, they
>>>>>> should be converted to whatever is declared in
>>>>>> `ds._set_code_unit_attributes`.
>>>>>>
>>>>>>
>>>>>> [1]
>>>>>> http://nbviewer.ipython.org/urls/dl.dropbox.com/s/bf62wclpjduvlit/example.ipynb?dl=0
>>>>>>
>>>>>> Chris
>>>>>>
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>>>>>>
>>>>>
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