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@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@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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