公式推导 直观自然的数学表达式,智能的关联菜单,交互式助手等协助您从容通过推导过程,让您更容易地完成解决方案的开发,快速.无错! 分析 Maple 内置超过大量的计算函数,包括积分变换,微分方程求解器(常微分方程.偏微分方程.微分代数方程),线性代数,统计,信号处理,FFT.小波等等,超过5000个计算命令让您通常只需要一个函数就可以完成复杂的分析任务.Maple 的计算引擎可 以帮助你解决最复杂的数学问题,您可以使用Maple的交互式工具对各种假定分析,以达到最佳参数值. 编程和代码生成 Ma
Problem Description A frog has just learned some number theory, and can't wait to show his ability to his girlfriend. Now the frog ,,⋯ from the bottom, so are the columns. At first the frog is sitting at grid (sx,sy), and begins his journey. To show
今天推导公式,发现居然有对矩阵的求导,狂汗--完全不会.不过还好网上有人总结了.吼吼,赶紧搬过来收藏备份. 基本公式:Y = A * X --> DY/DX = A'Y = X * A --> DY/DX = AY = A' * X * B --> DY/DX = A * B'Y = A' * X' * B --> DY/DX = B * A' 1. 矩阵Y对标量x求导: 相当于每个元素求导数后转置一下,注意M×N矩阵求导后变成N×M了 Y = [y(ij)] --> dY/
Toxophily Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1429 Accepted Submission(s): 739 Problem Description The recreation center of WHU ACM Team has indoor billiards, Ping Pang, chess an
Problem Description One day, Y_UME got an integer N and an interesting program which is shown below: Y_UME wants to play with this program. Firstly, he randomly generates an integer n∈[1,N] in equal probability. And then he randomly generates a permu
1 Unsupervised Learning 1.1 k-means clustering algorithm 1.1.1 算法思想 1.1.2 k-means的不足之处 1.1.3 如何选择K值 1.1.4 Spark MLlib 实现 k-means 算法 1.2 Mixture of Gaussians and the EM algorithm 1.3 The EM Algorithm 1.4 Principal Components