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Wigner Symbols

Project description

WIGXJPF evaluates Wigner 3j, 6j and 9j symbols accurately using prime factorisation and multi-word integer arithmetic.

Known issue

Please install pycparser first.

(See https://github.com/pypa/setuptools/issues/391#issuecomment-202919511 )

Inline usage information

Available inline:

import pywigxjpf as wig
help(wig)                # For interfaces.
help(wig.pywigxjpf)      # For usage information.

Library usage

The python interface to wigxjpf uses cffi.

Defines seven functions:

wig_table_init(max_two_j,wigner_type)
wig_table_free()
wig_temp_init(max_two_j)
wig_temp_free()

wig3jj(jj1,jj2,jj3, mm1,mm2,mm3)
wig6jj(jj1,jj2,jj3, jj4,jj5,jj6)
wig9jj(jj1,jj2,jj3, jj4,jj5,jj6, jj7,jj8,jj9)

Note that the arguments are to be given as integers, with twice the numeric value (this is what jj tries to indicate). I.e. half-integer arguments will be passed as odd integers.

The two init functions must be called before evaluating any symbol.

In addition, interfaces that take an array with the arguments are also provided:

wig3jj_array([jj1,jj2,jj3, mm1,mm2,mm3])
wig6jj_array([jj1,jj2,jj3, jj4,jj5,jj6])
wig9jj_array([jj1,jj2,jj3, jj4,jj5,jj6, jj7,jj8,jj9])

Project details


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