Home Forums GAMES102 几何建模与处理 计算\cos(\theta)时,出现绝对值大于1的数

Tagged: 

  • This topic has 0 replies, 1 voice, and was last updated 4 years ago by Q. C.
Viewing 0 reply threads
  • Author
    Posts
    • #7258 Score: 0
      Q. C
      Participant

      我在使用a.dot(b)/(a.norm()*b.norm())计算向量ab的夹角余弦值时,发现有出现余弦值绝对值大于1的情况。
      经过调试发现是由于norm()函数产生误差,使得 a.norm()*a.norm()与<a,a>的内积不相等。

      所以应该如何正确使用norm()计算模长呢?

      如图片所示,调试变量中 sqrt(dist(i-1))*sqrt(dist(i-1))与dist(i-1)存在较大误差,大到1e-5

      Attachments:
      You must be logged in to view attached files.
Viewing 0 reply threads
  • You must be logged in to reply to this topic.