Hi Reju,

One way to do this would be to modify the ‘Halo’ class in halo_objects.py to also contain your new definition (copying the format from the original virial_mass). 

As far as I’m aware (and I don’t use the halo profiler myself, so I could be wrong…) there isn’t a way of adding to the class from an external script. I think you have to modify. 

Elizabeth

On Jun 7, 2014, at 10:48 PM, Reju Sam John <rejusamjohn@gmail.com> wrote:

Hello Elizabeth ,

I Would like to create a new function virial_CRFraction()

>>> vcr = halos[0].virial_CRFraction() 

should give the virial CRFraction of the halo. 

where CRFraction is defined as follows 

@derived_field(name = "CRFraction")

def my_new_field(field, data):

    .

    .

    .

    .    

    temp =....

    return temp

On Sat, Jun 7, 2014 at 6:01 PM, Elizabeth Tasker <tasker@astro1.sci.hokudai.ac.jp> wrote:

Hi Reju,

If you want to see exactly what the function looks like, you can just examine you source directly for yt.

e.g. go into 

~/yt/src/yt-hg

and then grep for “virial_mass” (bearing in mind there are subdirectories). So:

grep virial_mass */*/*/*py

will tell you that this particular routine lives in:

~/yt/src/yt-hg/yt/analysis_modules/halo_finding/halo_objects.py

def virial_mass(self, virial_overdensity=200., bins=300):

.

.

.

Hope that helps!

If you explain a more clearly what you’d like a new function to do, we might be able to help a little more or point you to similar examples.

Elizabeth

On Jun 7, 2014, at 9:18 PM, Reju Sam John <rejusamjohn@gmail.com> wrote:

Where can I find the definition (source code) of the following function  ?

virial_mass(virial_overdensity=200.0, bins=300)

Like this function I have to create a new function for my derived field. 

--

Reju Sam John

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--

Reju Sam John

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