n.四個(gè)一組；四人一組；四元數(shù)

The norm of a quaternion is similar to that of a vector. 四元數(shù)的平均值與矢量的有點(diǎn)相似。

This paper studies comparatively dual Euler method and quaternion method which are used for the solution of the singularity of the Euler equation. 對(duì)解決歐拉方程奇異性的雙歐法和四元數(shù)法進(jìn)行了對(duì)比研究。