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PCA算法程序 pca
PCA算法程序设计步骤：
1、去均值
2、计算协方差矩阵及其特征值和特征向量
3、计算协方差矩阵的特征值大于阈值的个数
4、降序排列特征值
5、去掉较小的特征值
6、去掉较大的特征值(一般没有这一步）
7、合并选择的特征值
8、选择相应的特征值和特征向量
9、计算白化矩阵
10、提取主分量
(PCA algorithm programming steps: 1 to mean 2, calculation of covariance matrix and its eigenvalues and eigenvectors 3, the calculation of covariance matrix eigenvalues greater than the threshold number of 4, in descending order of eigenvalue 5, remove the smaller eigenvalue 6, remove the larger eigenvalue (usually not this step) 7, the combined choice of eigenvalues 8, select the appropriate eigenvalues and eigenvectors 9, computing whitening matrix 10, principal component extraction)
- 2021-03-09 13:09:27下载
- 积分：1
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int
符号积分法，有中文注释，大家试试，供参考学习~(Symbolic integration, notes in Chinese, we try, for reference to learn ~)
- 2009-04-09 23:54:47下载
- 积分：1
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CHANGCHANGLENGTH
说明： 复合材料层内基于断裂韧性退化的VUMAT子程序(VUMAT subroutine based on fracture toughness degradation in composite laminates)
- 2021-04-07 17:49:01下载
- 积分：1
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AddMatrix
用三元组表为结构，实现稀疏矩阵的加法并输出。(Achieve sparse matrix addition)
- 2014-02-19 19:59:00下载
- 积分：1
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潮流计算(3机9节点)
本程序应用python编程，用到3机9节点算例，数据也给出，可以实现潮流计算。(This program uses python programming, uses 3 machines and 9 nodes to calculate the example, and the data is also given, which can realize the load flow calculation.)
- 2020-07-03 05:00:02下载
- 积分：1
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e1
说明： 16点基4—FFT算法编程。输入16点的序列，采用基4-fft方法计算其快速傅里叶变换。(16 points-based 4-FFT algorithm for programming. Enter the 16-point sequence, with the base 4-fft method for calculating the fast Fourier transform.)
- 2010-11-19 18:21:25下载
- 积分：1
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smallest
这是数值计算当中最小二乘法的例子，在matlab中实现(This is the numerical calculations of the least squares method, for example to achieve Matlab)
- 2006-06-07 23:54:29下载
- 积分：1
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leifing
用谱方法计算流体力学一些流动现象的整体稳定性,利用自然梯度算法，包括四元数的各种计算。( Spectral methods of computational fluid dynamics flow of some of the overall stability of the phenomenon, Use of natural gradient algorithm, Including quaternion various calculations.)
- 2017-01-03 17:25:25下载
- 积分：1
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repeated-measures-ANOVA
用MATLAB实现单因素/两因素重复测量方差分析，自带工具包中只有非重复测量的方差分析函数ANOVA。anova_rm实现单因素；rm_anova2实现两因素( function stats = rm_anova2(Y,S,F1,F2,FACTNAMES) Two-factor, within-subject repeated measures ANOVA.For designs with two within-subject factors.
function [p, table] = anova_rm(X, displayopt)Single factor, repeated measures ANOVA.)
- 2021-01-26 17:58:37下载
- 积分：1
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ElectriFieldLine
用matlab对偶极子电场线描绘，能够和等势线一起画出。改变电荷量就能得到不同的电场线分布。(Electric field line of a diple)
- 2011-11-14 16:35:17下载
- 积分：1
