principal component analysis python

(regression, interpolation)2. Convex Optimization (global optimization, local optimality, constrained optimization)3. Integral (numerical integral, Analog integral)4. Symbolic calculation (base, equation, integral, differential)Eighth lecture, Random analysisThe characterization and research of uncertainty is an important aspect of financial research and analysis, and this paper introduces some knowledge of stochastic

Jieba "Jieba" Chinese Word Segmentation: The best Python Chinese Word Segmentation component "Jieba" Feature Three word segmentation modes are supported: Accurate mode, which is suitable for text analysis; Full mode: scans all words in a sentence that can be used as words. The speed is very fast, but ambiguity cannot be solved; The search eng

(attrs={"class": "C1"}), #这个属性, to create the desired style by setting it on the front endAdd: Generate native strings on the server and do not escape when front-end rendering is required" " = Mark_safe (txt) #前端可以正常显示 Select Radio Box:sel_inp= fields. Choicefield ( = [(1,'a'), (2,'b' ) ),])Select box:SEL_INP = Fields . Charfield ( = widgets. Select (choices=[(1,'a'), (2,'b ' ),]))Combo Multi-Select:radio_inp= fields. Multiplechoicefield ( = [(1,'a'), (2,'b ' ),] #含有multiple时可以

Python sorting method instance analysis and python sorting instance analysis This example describes the python sorting method. Share it with you for your reference. The details are as follows: >>> Def my_key1 (x ):... return x % 10... >>> alist = [4, 5, 8, 1, 63, 8] >>> al

participle" This open source software statistics The occurrence of each word in a dream of red mansions (that is, the frequency), and then use words as the characteristics of each chapter back, finally using the "principal component Analysis" algorithm to map each chapter back to three-dimensional space, So as to compare the terms of each chapter back to how sim

)1.707825127659933or accept a row, the operation of a column, by the parameter Axis=1 (row) or axis=0 (column) to control, such as:>>> C.mean (1)Array ([1.5, 3.5, 5.5])>>> C.mean (0)Array ([3., 4.])Linear algebra1. Use dox to multiply the matrix, as>>> A=np.array ([[5,7,2],[1,4,3]])>>> AArray ([[5, 7, 2],[1, 4, 3]])>>> B=np.ones (3)>>> bArray ([1., 1., 1.])>>> A.dot (b)Array ([14., 8.])Or:>>> Np.dot (a, B)Array ([14., 8.])A is the 2*3 array, B is the 3*1 array, then A.dot (b) is clearly the 2*1

crisis dataLesson Eighth: Data Aggregation and packet processing-data aggregation, grouping operations and transformations, pivot tables and cross-tablesThe third part of data analysis The Nineth lesson: Hypothesis Test--common hypothesis test and case analysisThe tenth lesson: linear regression--linear regression model, analysis result presentation and interpretation; Example: Commodity price forecast11th

a technique of 1.pandas Apply () and applymap () are functions of the Dataframe data type, and map () is a function of the series data type. The action object of the Apply () dataframe a column or row of data, Applymap () is element-wise and is used for each of the dataframe data. Map () is also element-wise, calling a function once for each data in series. 2.PCA decomposition of the German DAX30 index The DAX30 index has 30 stocks, it doesn't sound like much, but it's quite a lot, and it's nec

In-depth analysis of the use of builder mode in Python Design Mode Programming, python Design Mode Builder Mode: Separates the construction of a complex object from its representation, so that different representations can be created during the same construction process. Basic IdeasThe construction of a product is composed of many complex components;Some details

. push (42) 4 s. push ([3, 4, 5]) 5X=S. Pop () # x gets [3, 4, 5] (read) 6Y=S. Pop () # y gets 42 7 del s # Destroy s (delete) This statement calculates the value of the expression and then assigns the calculation result to the principal variable as its new value. When a value assignment occurs, principal's initial bound value of 1000 is discarded. The value assignment ends. Not only does the principa