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The Python community has developped a large set of additional modules for many
purposes. Some functions that SIC does not provide can be imported from an
external Python module. User can also define its own functions written with Python.
The numerical functions can be called from SIC formulas. When SIC does not find a
function in its own builtin or user-defined ones, it will have a look in the
Python main namespace area (if Python interpreter is launched!). If one object name
matches and is callable, it will call this Python function with the arguments you
SIC> PYTHON from scipy.special import jn
>>> from scipy.special import jn
SIC> PYTHON print jn.__doc__
>>> print jn.__doc__
y = jn(n,x) returns the Bessel function of integer order n at x.
SIC> DEF REAL A
SIC> A = JN(0,1)
SIC> EXA A
A = 0.7651977 ! Real GLOBAL
jn5 is the Bessel function, called here at
order 0 with x = 1. Always take care to import (or create) your Python
functions in the main namespace. Note that function names are fully lowercased
before trying to match them with Python names.