# principal component analysis python

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### [Mathematical model] python Implementation of principalcomponentanalysis and pythonAnalysis

[Mathematical model] python Implementation of principal component analysis and python Analysis Def pca (dataMat, topNfeat = 9999999): # data matrix. The top feat meanVals = mean (dataMat, axis = 0) is output) # calculate the aver

### (Data Science Learning Codex 20) Derivation of principalcomponentAnalysis principle &amp;python self-programmed function realization

main component from the largest contribution rate, until the cumulative contribution rate to meet the requirements;Then define the principal component load (loadings, which is called the factor load in the factor analysis):That is, the correlation coefficients of the first princi

### "Python" uses Python for principalcomponentanalysis

components in a lower proportion of PCA dimensionality, it uses a number of random algorithms to accelerate SVD. Full is the traditional SVD, using the corresponding implementation of the SCIPY library. Arpack and randomized similar to the applicable scenario, the difference is that randomized uses scikit-learn own SVD implementation, and Arpack directly uses scipy the library sparse SVD implementation. The default is auto, that is, the PCA class will go through the three alg

### [Python Machine learning and Practice (6)] Sklearn Implementing principalcomponentAnalysis (PCA)

factors other than the data set.2) orthogonal between the main components, can eliminate the interaction between the original data components of the factors.3) Calculation method is simple, the main operation is eigenvalue decomposition, easy to achieve.The main drawbacks of PCA algorithms are:1) The meaning of each characteristic dimension of principal component has certain fuzziness, which is not better

### [Machine Learning Algorithm Implementation] PrincipalComponentAnalysis (PCA)-based on python + numpy, pcanumpy

[Machine Learning Algorithm Implementation] Principal Component Analysis (PCA)-based on python + numpy, pcanumpy[Machine Learning Algorithm Implementation] Principal Component Analysis

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### Principle of principalcomponentanalysis and its implementation by Python

Principle of principal component analysis and its Python implementation preface:This article mainly refers to Andrew Ng's machine learning course handout, I translated, and with a Python demo demo to deepen understanding.This paper mainly introduces a dimensionality reductio

### "Machine Learning Algorithm-python realization" PCA principalcomponentanalysis, dimensionality reduction

references: The reference is the low-dimensional matrix returned. corresponding to the input parameters of two.The number of references two corresponds to the matrix after the axis is moved.The previous picture. Green is the raw data. Red is a 2-dimensional feature of extraction.3. Code Download:Please click on my/********************************* This article from the blog "Bo Li Garvin"* Reprint Please indicate the source : Http://blog.csdn.net/buptgshengod***********************************

### [Mathematical model] python Implementation of principalcomponentanalysis

[Mathematical model] python Implementation of principal component analysis Def pca (dataMat, topNfeat = 9999999): # data matrix. The top feat meanVals = mean (dataMat, axis = 0) is output) # calculate the average meanRemoved = dataMat-meanVals covMat = cov (meanRemoved, rowvar = 0) # Calculate the covariance matrix ei

### PythonprincipalComponentAnalysis PCA

://matplotlib.org/downloads.html(3) Dateutil and pyparsing modules: required when installing the configuration Matplotlib package. installation files for Win32: http://www.lfd.uci.edu/~gohlke/pythonlibs/3. The compilation encountered a problem:(1) Hint "No module name six", copy six.py Six.pyc six.pyo three files from \python27\lib\site-packages\scipy\lib to \python27\lib\ Site-packages directory.(2) Hint "Importerror:six 1.3 or later is required; You have 1.2.0 ", stating that the six.py versio

### Principalcomponentanalysis of Python remote sensing data

)#Display OutputFigure () Gray () forIinchRange (File_len): Subplot (3,4,i + 1) pic= Immatrix[i].reshape (180,360) pic= Pic[::-1]#picshow = rot90 (pic,4)imshow (pic) Colorbar () show ()#Convert to sample populationX =Immatrix. T#get to this sizeM,n = X.shape[0:2]#obtain the average of each sampleMeanval = mean (X,axis =0)#Tempmean = Tile (Meanval, (64800,1))#Sample matrix de -CentralizedX = X-tile (Meanval, (64800,1))#Calculate covarianceS = dot (x.t,x)/(m-1)#calculate eigenvalues eg and eigenve

### PrincipalcomponentAnalysis (PrincipalComponentANALYSIS,PCA

principal component Analysis ( Principal Component Analysis , PCA is a multivariate statistical analysis method that transforms multiple variables through a linear transformation to sel

### [Mathematical model] The principalcomponentanalysis Method Python implementation

def PCA (Datamat, topnfeat=9999999): #数据矩阵, output before Topnfeat feat meanvals = Mean (Datamat, axis=0) # Calculate Average meanremoved = datamat-meanvals Covmat = CoV (meanremoved, rowvar=0) #计算协方差矩阵 eigvals,eigvects = Linalg.eig (Mat (Covmat)) #特征值, eigvalind = Argsort (eigvals) #排序, to find the eigenvalues. In fact, the most inconsistent with other changes Eigvalind = eigvalind[:-( topnfeat+1): -1] #反转 redeigvects = eigvects[

### [ZZ] PrincipalComponentAnalysis (PCA) principal components

Http://matlabdatamining.blogspot.com/2010/02/principal-components-analysis.htmlEnglish principal components Analysis of the blog, write very good, worried after not open, full text reproduced.Principal Components AnalysisIntroductionReal-world data sets usually exhibit relationships among their variables. These relationships is often linear, or at least approxima

### PrincipalcomponentAnalysis (Principal, PCA)

Principle analysis of PCA algorithm for principal component analysesDiscussion on the understanding of principal component Analysis (PCA) algorithmPrincipal component

### pca--principalcomponentAnalysis (Principal)

the straight line, the direction vector of the line, and is the unit vector.4) The mean value of each dimension feature of the sample point (sample) is equal to the mean of the sample point projected onto U.The best projection vector u can make the sample point variance maximum after projection.In this case, the known mean value is 0, so the variance isTherefore, λ is the eigenvalues of Σ, and U is the eigenvector. The best projection line is the characteristic vector that corresponds to the ma

### R in action Reading Notes (19) Chapter 1 PrincipalComponent and factor analysis, action Reading Notes

R in action Reading Notes (19) Chapter 1 Principal Component and factor analysis, action Reading Notes Chapter 2 Principal Component and Factor Analysis Content of this Chapter Principal

### T-sne and principalcomponentAnalysis _ visualization

'] = e_cl.fit_transform (df[' Device_brand '].values) df[' Device_type ' ] = E_cl.fit_transform (df[' Device_type '].values) df[' network_type '] = e_cl.fit_transform (df[' Network_type ') DF = df.apply (pd.to_numeric,errors= ' coerce ') df = Df.dropna () x = Mbs.fit_transform (df.values) x = x[:6000] Digits_proj = Tsne (random_state=20150101). Fit_transform (x) pca_y = PCA (n_components=2). Fit_transform (x) plt.subplot (211) Plt.scatter (digits_proj[:,0],digits_proj[:,1])Plt.subplot (212) Plt

### Principle of principalcomponentAnalysis (PCA) and implementation of R language

Principle:Principal component Analysis-Stanford Principal component Analysis Method-think tank Principle of PCA (Principal Component analysis

### R Language Learning Note (12): Principalcomponentanalysis and factor analysis

#主成分分析par (mfrow= (c)) library (Psych) head (usjudgeratings,5) head (usjudgeratings[,-1],5) Fa.parallel ( Usjudgeratings[,-1],fa= "PC", N.iter=100,show.legend = false,main= "scree plot with parallel analysis")#如, one of the main ingredients found in the test data#提取主成分pc Principal Components AnalysisCall:principal (r = usjudgeratings[,-1], nfactors = 1)Standardized loadings (pattern matrix) based upon corre

### Mathematics in Machine learning (4)-Linear discriminant analysis (LDA), principalcomponentanalysis (PCA)

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