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一阶导数的五点数值微分公式及外推算法 被引量:6
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作者 王燕 《数学的实践与认识》 CSCD 北大核心 2011年第6期163-167,共5页
通过对四次Lagrange插值多项式求导推导出一阶导数的五点数值微分公式,其截断误差为O(h^4).利用Richardson外推原理得到该公式的外推算法,K次外推后,中间节点的数值精度提高到O(h^(2(k+2))),其它节点的精度提高到O(h^(k+4)).
关键词 插值多项式 Richardson外推算法 五点数值微分公式
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High-Precision Direct Method for the Radiative Transfer Problems
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作者 ZHANG Yan HOU Su-Qing +1 位作者 YANG Ping WU Kai-Su 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第6期782-788,共7页
It is the main aim of this paper to investigate the numerical methods of the radiative transfer equation. Using the five-point formula to approximate the differential part and the Simpson formula to substitute for int... It is the main aim of this paper to investigate the numerical methods of the radiative transfer equation. Using the five-point formula to approximate the differential part and the Simpson formula to substitute for integral part respectively, a new high-precision numerical scheme, which has 4-order local truncation error, is obtained. Subsequently, a numerical example for radiative transfer equation is carried out, and the calculation results show that the new numerical scheme is more accurate. 展开更多
关键词 radiative transfer equation direct method five-point numerical formula truncation error
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