NJGRAF — An efficient program for calculation of general recoupling coefficients by graphical analysis, compatible with NJSYM

Abstract
NJGRAF calculates angular momentum recoupling coefficients by graphical methods. The results are sums of products of 6j coefficients. These can be evaluated several times with different values of the arguments. The number and the range of summation variables are minimal. It is intended to replace NJSYM, with a gain of computer time of up to two orders of magnitude.

Title of program: NJGRAF
Catalogue Id: ABBY_v1_0

Nature of problem
This program calculates a general recoupling coefficient for an arbitrary number of integer or half-integer angular momenta.

Versions of this program held in the CPC repository in Mendeley Data
ABBY_v1_0; NJGRAF; 10.1016/0010-4655(88)90192-0

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)

{'Abstract': 'NJGRAF通过图解法计算角动量重新耦合系数。结果为6j系数乘积之和。这些系数可以多次使用不同的参数值进行评估。求和变量的数量和范围均保持最小化。旨在替代NJSYM，从而在计算机时间上获得两个数量级的提升。', 'Title of program': '程序名称：NJGRAF', 'Catalogue Id': '目录编号：ABBY_v1_0', 'Nature of problem': '本程序计算任意数量整数或半整数角动量的通用重新耦合系数。', 'Versions of this program held in the CPC repository in Mendeley Data': '此程序版本存储于Mendeley数据中心的CPC程序库中', "This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)": '本程序已从贝尔法斯特女王大学的CPC程序库中导入（1969-2019）'}