做机器人逆运动学（IK）的时候，你迟早会遇到矩阵指数和对数这些东西。为什么呢？因为计算三维旋转的误差，不能简单地用欧氏距离那一套，那只对位置有效。旋转得用另一套方法——你需要算两个旋转矩阵之间的差异，这就涉及到矩阵对数了。

Stocks on Wall Street inched further into record territory in afternoon trading Thursday, following new economic data and a mixed batch of earnings reports from big U.S. companies. The S&P 500 was up ...

DENVER — (AP) — The Colorado Avalanche added depth at forward on Wednesday by signing Victor Olofsson to a one-year deal. The 30-year-old Olofsson spent last season with the Vegas Golden Knights, ...

Cynthia Sass is a nutritionist and registered dietitian with master's degrees in both nutrition science and public health. Frequently seen on national TV, she's Health's contributing nutrition editor ...

‘The Map That Leads to You,’ directed by Lasse Hallstrom, released on Prime Video on August 20 and stars Madelyn Cline, KJ Apa, Sofia Wylie, Madison Thompson, and ...