Hi,

I am trying to calculate a function with a complete elliptic integral
of the 1st kind

I have defined

Phase = 4.*sqrt(p/(p -6. - 2.*e)) * ellipk(-4.*e/(p - 6. -2.*e))

where

a_mpc = 4.0

p = a_mpc * (1 - e**2.)

and I have of course done this

#!/usr/bin/env python
from pylab import *

But when calling the script, I get:

NameError: name 'ellipk' is not defined

What am I doing wrong? Any help will be very much appreciated.

Thanks a lot,

Pau

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