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http://vanilla-chan.cn/blog/2024/06/10/How-to-calculate-R-2-and-r-in-Matlab/
Problem当你使用polyfit函数进行多项式拟合之后,你希望计算决定系数或者相关系数看看拟合效果如何。聪明的你肯定觉得聪明的 Matlab 的polyfit函数的返回值中会有$R^2$或者$r$吧。你尝试disp了一下,发现有一个结构体$S$。再查一查帮助文档,发现误差估计结构体$S$中只有一个范德蒙德矩阵$R$、自由度$df$和残差的范数$normr$,并没有你想要的$R^2$或者$r$。
http://vanilla-chan.cn/blog/2024/06/08/Welcome/?
由于洛谷个人简介迟迟没有维护完毕,故在博客园同步一份 欢迎来看我的博客!
http://vanilla-chan.cn/blog/2024/06/10/AtCoder-Beginner-Contest-357-C/
ProblemFor a non-negative integer
http://vanilla-chan.cn/blog/2024/03/03/%E6%B4%9B%E8%B0%B7P1580-yyy-loves-Easter-Egg-I/
洛谷传送门 调试的有点惨痛的简单字符串模拟题目
http://vanilla-chan.cn/blog/2024/02/05/AtCoder-Beginner-Contest-341-F/
F - Breakdown Problem给你一个由
http://vanilla-chan.cn/blog/2024/02/20/CF1928G-Vlad-and-Trouble-at-MIT/
Vlad and Trouble at MIT ProblemMIT的学生宿舍可以用一棵有$n$个顶点的树来表示,每个顶点代表一个房间,每个房间一个学生。 今晚,有三种类型的学生: 想参加派对和玩音乐的学生(标记为
http://vanilla-chan.cn/blog/tags/
但Vanilla会努力的
http://vanilla-chan.cn/blog/about/
我叫
http://vanilla-chan.cn/blog/2024/03/07/CF-contest-1935-Round-932-Div-2-A-D%E9%A2%98%E8%A7%A3/
Codeforces Round 932 (Div. 2) A-D题解Codeforces Round 932 (Div. 2) 绪言很菜,AB速度慢,卡在C,想DP,但是时间优化不下来,说服自己$2\times10^3$能过$n^3$,D稍微简单,但是没看D,遂掉分。
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