摘要： 转自：https://www.cnblogs.com/mfrbuaa/p/5319365.html 麻省理工学院线性代数课笔记。 1.一维投影 2.三维投影 最后还涉及到了最小二乘法的几何意义。也就是投影得到的公式啊！ 阅读全文

摘要： The basic task is simple: given N real numbers, you are supposed to calculate their average. But what makes it complicated is that some of the input n 阅读全文