[yt-dev] axes units behaving correctly?

Chris Malone chris.m.malone at gmail.com
Thu Oct 2 12:45:33 PDT 2014


So I should be interpreting code_* units as separate from whatever is set
as ds.length_unit, ds.time_unit, ds.mass_unit, etc.?

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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