[yt-users] ProjectionPlot of a new field

[Geoffrey So]

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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