[yt-users] ProjectionPlot of a new field

[Nathan Goldbaum]

Hi Geoffrey,

It depends on what you're trying to do.

Can you share the script you're working on?

-Nathan

On Mon, Feb 24, 2014 at 6:24 PM, Geoffrey So <gsiisg at gmail.com> wrote:
> A follow-up question,
>
> Is there a way to change the labels on the x, y axes and colorbar text?
>
> From
> G.S.
>
>
> On Mon, Feb 24, 2014 at 5:31 PM, Geoffrey So <gsiisg at gmail.com> wrote:
>>
>> Hi Sam,
>>
>> I might be mistaken but it seems the convert_function requires there to be
>> already a cgs conversion factor YT knows about, and unfortunately this field
>> I'm working with does not have that.  What I used to do is just multiply the
>> conversion factors in after making the FRB, but I'm starting to try to using
>> the new Projection/PhasePlot.
>>
>> I tried the script you have up there, and I think it is doing the same
>> thing I was with the FRB.  At least I see the colorbar also changed
>> accordingly, which is exactly what I hoped for, thanks!
>>
>> From
>> G.S.
>>
>>
>>
>> On Mon, Feb 24, 2014 at 4:52 PM, Sam Skillman <samskillman at gmail.com>
>> wrote:
>>>
>>> Hi Geoffrey,
>>>
>>> Yes, it would save time to multiply the projection object by a constant
>>> factor if your projection has already been done. However, it is a bit
>>> dangerous to do this since now you need to manually edit how all the
>>> units/labels work out.
>>>
>>> I'd suggest just creating a new derived field that uses the
>>> convert_function option
>>> (http://yt-project.org/docs/dev/analyzing/creating_derived_fields.html#field-options).
>>> A good, non-trivial example is the SZY field:
>>>
>>> https://bitbucket.org/yt_analysis/yt/src/61e6b84f875cc8fcf25b5b1e67ddd501a19daf68/yt/data_objects/universal_fields.py?at=yt#cl-577
>>>
>>> If you do want to manually modify an projection object, you can do
>>> something like the following:
>>>
>>> from yt.mods import *
>>> pf = load('IsolatedGalaxy/galaxy0030/galaxy0030')
>>> proj_pw = ProjectionPlot(pf, 0, 'Density', weight_field='Density')
>>> proj_pw.save('before')
>>> proj_pw.data_source['Density'] *= 1.5
>>> proj_pw.refresh()
>>> proj_pw.save('after')
>>>
>>> Sam
>>>
>>>
>>>
>>> On Mon, Feb 24, 2014 at 12:26 PM, Geoffrey So <gsiisg at gmail.com> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> Will I be saving computation time by multiplying some constant
>>>> conversion factors on the projection object instead of creating a derived
>>>> field with an existing field multiplied by the factors?
>>>>
>>>> And how would I go about multiplying the projection by some factors?
>>>>
>>>> If there's no significant saving I'll just do the derived field.
>>>>
>>>> From
>>>> G.S.
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
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>>
>
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