Hello Reju,

I think you are using yt2.x, then you can do it like that, create a field

h=0.702
Box_size_Simulation = 128 * 1000 * (1+z) * h # if box size of simulation is 128Mpccm/h

@derived_field(name = "Know_cell_size", take_log=False, units='')
def _Name(field, data):
    temp = data["mach_number"].copy()
    temp.fill(0)
    ind = np.where(data['dx']*Box_size_Simulation*h < 100)
    temp[ind]= 1.0
    return temp

Now you can find the number of cells less than 100 kpc by taking the total of the created field ("Know_cell_size") within the specific region you want. Something like sp.quantities.total_quantity("Know_cell_size") in yt3.x

Regards

-Prateek

On Thu, Nov 1, 2018 at 3:30 PM Reju Sam John <rejusamjohn@gmail.com> wrote:

Dear all,

I have the following derived field:
h=0.702
@derived_field(name = "Name", take_log=False, units='g/s**3')
def _Name(field, data):
    temp = data["Mach"].copy()
    temp.fill(0)
    ind = np.where(((data['dx']*128*1000)*(1+z)*h<100))
    temp[ind]= 0.5*data["Density"][ind]*(data["Mach"][ind]*data["SoundSpeed"][ind])**3

    return temp
How to check that, how many cells with cell size less than 100 kpc (data['dx']*128*1000)*(1+z)*h<100) ?

thankyou
--
Reju Sam John
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