[yt-users] Potential problem with the field_parameters dictionary in SlicePlot (and certainly others)

Nathan Goldbaum nathan12343 at gmail.com
Wed Sep 3 10:07:52 PDT 2014


On Wed, Sep 3, 2014 at 10:05 AM, Chris Malone <chris.m.malone at gmail.com>
wrote:

> Hi Antoine,
>
> As you hinted, the field_parameters dictionary is mainly used for derived
> fields and defaults to the center of the domain.  For a SlicePlot (and
> others), the keyword variable 'center' is actually what determines where in
> the domain the slice should be taken - it is completely independent of the
> field_parameters['center'] value.
>

You can also adjust the plot center using the set_center function that
hangs off of SlicePlot instances.


>
> Hope that helps.
>
> Chris
>
>
> On Wed, Sep 3, 2014 at 10:45 AM, Antoine Strugarek <
> strugarek at astro.umontreal.ca> wrote:
>
>> Hi Matthew,
>>
>> Thank you for the quick answer. I’m on 3.0 (obtained with yt.__version__).
>>
>> I’m not completely sure how to fix this since I’m discovering the code,
>> but I’m suspecting something strange there. To my understanding, the
>> field_parameters dictionary given in argument to SlicePlot should be used
>> for derived fields only, and the center keyword to specify the location
>> where the Slice should be taken, right?
>> Also, if I specify in advance the center (doing ad = ds.all_data() ;
>> ad.set_field_parameter("center", custom_center)), this new center does not
>> seem to be used in the SlicePlot to compute, e.g., the cylindrical radius
>> (in this latter case I try to do a SlicePlot without giving a
>> field_parameters dictionary in argument).
>>
>> Antoine
>>
>>
>> Le 2014-09-03 à 12:27 , Matthew Turk <matthewturk at gmail.com> a écrit :
>>
>> > Hi Antoine,
>> >
>> > Thanks for reporting this!  Which version of the code are you on?  "yt
>> > instinfo" should be able to tell you this.
>> >
>> > -Matt
>> >
>> > On Wed, Sep 3, 2014 at 11:08 AM, Antoine Strugarek
>> > <strugarek at astro.umontreal.ca> wrote:
>> >> Hi,
>> >>
>> >> I’ve been trying to specify by hand the ‘center’ entry of the
>> dictionary field_parameters to a SlicePlot so that the derived field can
>> make use of another center to compute, e.g., cylindrical coordinates. After
>> tracking why my specified center had no effect, I noticed that the function
>> _set_center is called when a SlicePlot is created, and this function erases
>> any ‘center’ entry in the field_parameters dictionary, putting there the
>> ‘center’ keyword specified as an argument to SlicePlot. It appears to me
>> this should not be the normal behaviour, but I may be misunderstanding
>> something. I would naively suggest not to update the ‘field_parameters’
>> dictionary in the _set_center function, though I’m not completely sure?
>> >>
>> >> Thanks in advance for your help and suggestion about this issue!
>> >>
>> >> Antoine
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