New efficient programs to calculate general recoupling coefficients. Part II: Evaluation of a summation formula Original Research Article

In Comput. Phys. Commun. 83 (1994) 275, we described a program NJFORMULA to generate a summation formula in terms of 6-j coefficients for a general angular momentum recoupling coefficient. Here we present programs for the second part of the problem, i.e. the numerical computation of a general recoupling coefficient by evaluating the formula generated by the program NJFORMULA. We describe a sequential version NJSUMMATION, written in C, which runs on a range of computers, as well as a parallel version NJSUMPAR, also written in (Parallel) C, which runs on an arbitrary network of transputers.