[yt-users] passing parameters to 'ray'

[Sam Skillman]

Hi Elizabeth,

It looks like there might be an issue with the transfer of parameters after
using validate spatial, which creates a smoothed covering grid.  I'll get
back to you when I figure it out.

Best,
Sam

On Thu, Aug 11, 2011 at 2:53 PM, Elizabeth Tasker <taskere at mcmaster.ca>wrote:

> Hi Sam,
>
> OK, I've succeeded in breaking your improved script. When you try and set
> both parameter and spatial validators, the code stops recognising them. So:
>
> add_field("RayTest", function=_RayTest, validators=[ValidateParameter(**
> "disk_vector")])
>
> works while
>
> add_field("RayTest", function=_RayTest, validators=[ValidateParameter(**"disk_vector"),
> ValidateParameter("disk_**center"), ValidateSpatial(1, ["x-velocity",
> "y-velocity", "z-velocity", "x", "y", "z"])])
>
> does not.Which it why it didn't work in my longer script.
>
> Perhaps I've put the format in incorrectly?
>
> Elizabeth
>
>
>
> Elizabeth Tasker wrote:
>
>> Hi Sam,
>>
>> Thank you -- my test script now works fine but I've managed to break my
>> longer one so completely it's become impossible to test anything. Oops.
>> However, I think when I tried the method below originally, I put the
>> set_field_parameters in the wrong place, which would explain why they didn't
>> work.
>>
>> Thanks loads for the example.
>>
>> Elizabeth
>>
>> Sam Skillman wrote:
>>
>>> Hi Elizabeth,
>>>
>>> So the problem is that when you add_field and ask to validate the
>>> height_vector, it doesn't exist yet.  I believe you can get the desired
>>> behavior with:
>>>
>>> from yt.mods import *
>>>
>>> def _RayTest(field, data):
>>>
>>>    center = data.get_field_parameter("**center")
>>>    h_vec = na.array(data.get_field_**parameter("height_vector"))
>>>
>>>    print "center :", center, "h_vec: ", h_vec
>>>
>>>    return data["Density"]
>>>
>>> add_field("RayTest", function=_RayTest)
>>>
>>> # Grab data
>>> fn = "GravPotential/DD0301/GT_**BTAccel_256AMR4_PeHeat_sf5_**SNe_0301"
>>> pf = load(fn)
>>> ray1 = pf.h.ray((2.0, 2.0 ,2.0), (12.0, 12.0, 12.0))
>>> ray1.set_field_parameter('**height_vector',na.array([0.,0.**,1.]))
>>> ray1.set_field_parameter('**center',[0.5]*3)
>>> ray1["RayTest"]
>>>
>>> When I run this I get: center : [0.5, 0.5, 0.5] h_vec:  [ 0.  0.  1.]
>>>
>>> I'm not sure what dd was in your dd.center since dd wasn't defined in
>>> that script, but you should be able to set center to whatever you want here.
>>>  I also changed density to Density.
>>> Best,
>>> Sam
>>>
>>> On Wed, Aug 10, 2011 at 9:36 AM, Elizabeth Tasker <taskere at mcmaster.ca<mailto:
>>> taskere at mcmaster.ca>> wrote:
>>>
>>>    Hi Matt,
>>>
>>>    I think this script explains what I mean. When I run it, I get:
>>>
>>>    /1/home/taskere/yt/yt/data_**objects/field_info_container.**py in
>>>    __call__(self, data)
>>>      357                 doesnt_have.append(p)
>>>      358         if len(doesnt_have) > 0:
>>>    --> 359             raise NeedsParameter(doesnt_have)
>>>      360         return True
>>>      361
>>>
>>>    NeedsParameter: (['height_vector'])
>>>
>>>
>>>    As a side note, I think 'ray' sets its own value for the field
>>>    parameter, "center", making it the start of the ray. If that's
>>>    true, does it have problems for calling radius? e.g.
>>>
>>>    ray["Radius"]
>>>
>>>    where radius would need to be the center of the object, not
>>>    necessarily the start of the ray? (This particular issue wouldn't
>>>    affect me, but I thought it might bite someone later).
>>>
>>>    Elizabeth
>>>
>>>
>>>
>>>    Matthew Turk wrote:
>>>
>>>
>>>        Hi Elizabeth,
>>>
>>>        Could you elaborate on what you mean, and provide an example
>>>        script?
>>>
>>>        Thanks,
>>>
>>>        -Matt
>>>
>>>        On Aug 10, 2011 7:22 AM, "Elizabeth Tasker"
>>>        <taskere at mcmaster.ca <mailto:taskere at mcmaster.ca>
>>>        <mailto:taskere at mcmaster.ca <mailto:taskere at mcmaster.ca>>> wrote:
>>>        > Hi,
>>>        >
>>>        > I'm having problems passing parameters to a ray object. I'm
>>>        trying:
>>>        >
>>>        > ray1 = pf.h.ray( com[c], com[nearestcore], field_parameters =
>>>        > {'height_vector':na.array([0,**0,1]), 'center':dd.center})
>>>        > Omega0 = ray1["Omega"]
>>>        >
>>>        > and I also tried out:
>>>        >
>>>        > ray1.set_field_parameter("**height_vector", na.array([0,0,1]))
>>>        > ray1.set_field_parameter("**center", dd.center)
>>>        >
>>>        > But it can't recognise them.
>>>        >
>>>        > Elizabeth
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