[yt-users] light ray woes

[Stephanie Tonnesen]

OH yeah, that is the other funky thing about what I am doing...(I am
rolling my eyes at myself for not mentioning this right away...)

I am using another person's enzo run, and he cannot find the parameter
file.  I made one as best as I could from copying a redshift output into
what I thought the format should be, but there could be some problems
there.

See attached.  Just in case, I am also attaching the redshiftoutput file
that I used.

Thank you for looking into this!

Stephanie

--
Dr. Stephanie Tonnesen
Alvin E. Nashman Postdoctoral Fellow
Carnegie Observatories, Pasadena, CA
stonnes at gmail.com

On Thu, May 26, 2016 at 4:20 AM, Britton Smith <brittonsmith at gmail.com>
wrote:

> Hi Stephanie,
>
> Could you send along the Enzo parameter file that you're using with this
> light ray?
>
> Britton
>
> On Thu, May 26, 2016 at 4:41 AM, Cameron Hummels <chummels at gmail.com>
> wrote:
>
>> Stephanie,
>>
>> It looks like there are two problems you're encountering.  One, you're
>> trying to include a field "velocity", when there is no such field in your
>> dataset, only 3 scalar fields for "velocity_x", "velocity_y"...  These will
>> be included by default when you set use_peculiar_velocity=True as you are
>> doing.  So for one, remove the velocity field from your list of fields.
>> The second problem, as you quite rightly identify, is that yt is messing up
>> the order that it's getting the redshifts of the outputs, so it's jumping
>> straight from 0.4 to 0.1.  I can't dig into the code right now to see why
>> it is ordering it weirdly, but I might be able to look at it in the next
>> day or two.  Britton may also have an idea on what is going on here.
>>
>> Also of note is that there are some nice wrapper functions on the
>> LightRay functionality in the new Trident code.  In particular, the
>> make_compound_ray function wraps this cleanly.  That said, it will not fix
>> this problem, as it is just using the underlying yt LightRay
>> infrastructure:
>> http://trident.readthedocs.io/en/latest/generated/trident.make_compound_ray.html#trident.make_compound_ray
>>
>> Cameron
>>
>> On Wed, May 25, 2016 at 1:47 PM, Stephanie Tonnesen <stonnes at gmail.com>
>> wrote:
>>
>>> Hi all,
>>>
>>> I am trying to make a light ray using a few redshift outputs from z=0.4
>>> to z=0.1.  Right now I just have two commands in my code taken basically
>>> directly from the docs:
>>>
>>> lr = LightRay("CBOX.enzo",simulation_type="Enzo",near_redshift=0.1,
>>>
>>> far_redshift=0.4,time_data=False,redshift_data=True,find_outputs=True)
>>>
>>>
>>> lr.make_light_ray(seed=8934876,fields=['temperature','density','velocity'],use_peculiar_velocity=True)
>>>
>>> My current problem is that the first command "LightRay" doesn't seem to
>>> be using any of my outputs between 0.4 and 0.1!  I am attaching the error
>>> file, and you can see that it finds 9 outputs, 7 of which are between and
>>> including 0.4 to 0.1.  However, then it claims that I am asking it to go
>>> straight from 0.399996 to 0.1.
>>>
>>> I do only have redshift dumps to work with, but I think that those
>>> should be used since redshift_data=True
>>>
>>> Does anyone have any advice for making this work?
>>>
>>> Thanks,
>>> Stephanie
>>> --
>>> Dr. Stephanie Tonnesen
>>> Alvin E. Nashman Postdoctoral Fellow
>>> Carnegie Observatories, Pasadena, CA
>>> stonnes at gmail.com
>>>
>>> _______________________________________________
>>> yt-users mailing list
>>> yt-users at lists.spacepope.org
>>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>>
>>>
>>
>>
>> --
>> Cameron Hummels
>> NSF Postdoctoral Fellow
>> Department of Astronomy
>> California Institute of Technology
>> http://chummels.org
>>
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>>
>>
>
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