[yt-users] ProjectionPlot of a new field

[Geoffrey So]

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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