Hi,

according to

http://yt-project.org/docs/2.6/analyzing/creating_derived_fields.html?

what worked for me for enzo data is the following

def _HINeutralFraction(field, data):

return data['HI_Density']/(data['HI_Density']+data['HII_Density'])

add_field('HINeutralFraction',function=_HINeutralFraction,

units=r"\rho_\mathrm{HI}/\rho_\mathrm{H}")

unless there's something strange with ramses dataset, the above should work.

From

G.S.

On Thu, Aug 14, 2014 at 10:12 AM, Professor Maller <amaller@citytech.cuny.edu> wrote:

Hi,

Does anyone have code to create derived fields of ionization states, e.g. HI, for ramses data sets? If that's a no, does anyone have an example of a derived field where you have to read in a table and interpolate the field values.

Thanks,

Ari

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