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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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neff_m72
改程序是计算出金属表面等离子体直波导的有效折射率随波长和传输长度随波的两色散曲线，另外给定Drude-Lorentzia模型参数给定后，还可以求解介电常数以及画出相应实部和虚部的曲线(This programer is used to calculate Ag relative dielectric constant
accroding to the Drude-Lorentzia and sovle the transcendental equation
for even illumination. At the same time,it can draw the diagram of
relationship between the dispersion curve and the Transmission with
the length. )
- 2012-10-18 20:33:53下载
- 积分：1
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Delany_Bazley
纤维状多孔材料的D_B吸声模型，用于计算高孔隙率的刚性多孔材料的吸声系数(D_B absorption model fibrous porous material for sound absorption coefficient high porosity rigid porous material)
- 2021-03-13 10:09:25下载
- 积分：1
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composite_streng_compute
复合材料强度计算的程序，采用与ansys软件集成后计算(Composite material strength calculation procedures, the use of ANSYS software and the integration of computing)
- 2008-01-03 22:35:13下载
- 积分：1
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lsq
打靶法求微分方程边值问题，这是数学上的求取方程问题的边值的方法
(Shooting method for boundary value problems for differential equations, which is to strike a mathematical equation of the boundary value problem approach)
- 2008-05-22 19:46:32下载
- 积分：1
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mazar-model_umat
UMAT in ABAQUS for Mazar s model of concrete damage
- 2012-09-03 10:45:03下载
- 积分：1
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1
说明： fluent数值计算中在指定单元坐标加入源项的udf(Add source term to cell coordinates in numerical analysis)
- 2018-07-28 10:08:29下载
- 积分：1
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xianshi
偏微分方程数值解上机实习 运用古典显式差分格式求解二维扩散方程的初边值问题 运用P-R差分格式求解二维扩散方程的初边值问题
- 2020-11-11 10:19:45下载
- 积分：1
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jacobi
对于方程组AX=b，当系数矩阵非奇异时，对原方程进行改写，利用公式X^k=BX^(k+1)+g进行迭代求解。(For equations AX = b, when the coefficient matrix is nonsingular, rewriting the original equation, using the formula X ^ k = BX ^ (k+1)+g for iterative solution.)
- 2013-10-26 10:11:06下载
- 积分：1
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3nodes
基于牛拉法的电力系统潮流计算，该程序是计算IEEE3节点的，采用matlab编程(Cattle Rafah-based power system load flow calculation, the program the calculation IEEE3 node, using matlab programming)
- 2020-12-17 21:29:12下载
- 积分：1
