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Basic syntax, basic operations and functions of R language The following code details the basic syntax and arithmetic operators, relational operators, logical operators and some basic mathematical functions of R language Mathematical operator The following table lists the main mathematical operators and their operation order: prioritySymbol ...

Pandas is an open source, BSD licensed library that must be mastered when starting Python to do data analysis. It provides high-performance, easy-to-use data structures and data analysis tools. The main data structures are Series (one-dimensional data) and DataFrame (two-dimensional data), which are sufficient to deal with most typical use ...

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1 pandas Library Our general alias is pd: import pandas as pd pandas can not only read data from a variety of different file formats, but also have a variety of data processing functions. 1.1 using pandas to read csv files The pandas module provides a read_ csv method, you can directly read the csv file and return a DataFrame object. ...

1, Basic usage of Numpy array 1. Numpy is a Python scientific computing library used to quickly process arrays of arbitrary dimensions. 2. NumPy provides an N-dimensional array type ndarray, which describes a collection of "items" of the same type. 3. numpy.ndarray supports vectorization. 4. NumPy is written in c language, and the GIL ...

Hello, everyone. I'm Mr. Tony, who only talks about technology and doesn't cut his hair. Recently, a friend shared that he participated in the internship interview of data analyst of an Internet (live delivery) company. The following is my analysis of relevant SQL test questions. The database used is MySQL 8.0. If you find the article useful, ...

1. Case conversion and filling of English letters s = pd.Series(['lower', 'CAPITALS', 'this is a sentence', 'SwApCaSe']) Uppercase to lowercase: s.str.lower()Lowercase to uppercase: s.str.upper()Change to news title form: s.str.title()The first letter is uppercase, and the rest is lowercase: s.str.capitalize()Convert the original upperca ...

Creative background This dish chicken recently encountered such a column of data during data analysis, as shown in the figure What I want to do is: Extract the administrative divisions and names. eg: Jiangsu Province, Beijing. The goal has been achieved, see article. Like pd.to_ Time can be called after datetime()_ Series.dt.year returns ...

In financial data analysis or quantitative research, the processing of time series data can not be avoided. Time series refers to the value sequence of a variable measured in time order within a certain time. Common time series data include temperature series that change with time in a day, or stock price series that fluctuate continuously duri ...