计算物理 ›› 1992, Vol. 9 ›› Issue (S2): 714-716.

• 论文 • 上一篇    下一篇

分子积分中辅助函数的任意精度计算(Ⅰ)——用向前递推方案计算不完全Gamma函数

李延欣, 董夏兰, 潘守甫   

  1. 吉林大学原子与分子物理研究所, 130023
  • 收稿日期:1992-01-19 出版日期:1992-12-31 发布日期:1992-12-31

COMPUTATION OF AUXILIARY FUNCTIONS IN MOLECULAR INTEGRAL UP TO ARBITRARY ACCURACY(Ⅰ)EVALUATION OF INCOMPLETE GAMMA FUNCTION BY FORWARD RECURRENCE SCHEME

Li Yanxin, Dong Xialan, Pan Shoufu   

  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130023
  • Received:1992-01-19 Online:1992-12-31 Published:1992-12-31

摘要: 本文给出v∈[0,∞)和z∈(-∞,0]时标准不完全Gamma函数的两个基本不等式。由此出发,推导出这种函数向前递推方案的误差规律。此误差规律所预计的相对误差与数值实验给出的相对误差下限在vz的定义域内几乎重合。

关键词: 分子积分, 不完全Gamma函数, 误差分析, 数值实验, 不等式

Abstract: Two inequalities of incomplete Gamma function are given for the domain v∈[0,-∞) and z∈(-∞,0].Based upon the inequalities, we derive the round off error propagation regularity of the forward recurrence scheme. Our numerical experiments indicate that the relative error predicated by our regularity almost coincides with that from authentic regularity in the whole domain of v and z.

Key words: molecular integral, incomplete Gamma function, error analysis, numerical experiment, inequality