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Cheng ChengLuFred

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  • Stevens Institute of Technology
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ChengLuFred / package_management.md
Last active October 25, 2020 22:46
[Package Management in Python] smart way to import modules #Python

Import module from different file

import file_name as fn

or

from file_name import *
@ChengLuFred
ChengLuFred / operaters.md
Created September 16, 2020 03:17
[Operators in R] #R 
%in%
@ChengLuFred
ChengLuFred / flow_chart.md
Last active July 15, 2020 02:37
[Graph in Latex] #Latex

0 Package

\usepackage{tikz}                               % package Tikz for flow chart
\usetikzlibrary{shapes.geometric, arrows}       % package Tikz for flow chart

1 Defination of Node in Flow Chart

To begin with, we need define some nodes with specific shape and attributes.




  


  




    


          
    

      

        
        

          

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                ChengLuFred
                / dataframe.md
            
            

              Last active
              October 4, 2020 01:12
            

              
                [Data Process] #Python
              
          

        

      

        

  

      

    
0 Package


import pandas as pd


1 Index and locating


create multiple index and locate data according to multi-level index





  


  




    


          
    

      

        
        

          

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                ChengLuFred
                / re.md
            
            

              Last active
              June 25, 2020 00:53
            

              
                [Regular Expression] split text according to requirement #Python
              
          

        

      

        

  

      

    
Use re(regular expression) to split text


re.split('\W+|_',x)


We use | to seperate symbols that we want to use as spliter. Here \W+ means words. An example is following,


>>>text = 'I:\\Textual Analysis Data\\19950131_10-K_edgar_data_69970_0000950152-95-000069_1.txt'
>>>re.split('\W+',text)
['I',



  


  




    


          
    

      

        
        

          

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                ChengLuFred
                / cheat_sheet.md
            
            

              Last active
              June 23, 2020 17:30
            

              
                [Cheat Sheet for WSL] often used option #cmd
              
          

        

      

        

  

      

    
    

  • switch between WSL(Ubuntu) and CMD(Windows)
    • 



$ cmd.exe # to change to windows cmd
$ wsl.exe # to change to wsl ubuntu terminal




  


  




    


          
    

      

        
        

          

              @ChengLuFred
          

          

            
                ChengLuFred
                / cheat sheet.md
            
            

              Last active
              January 14, 2024 05:42
            

              
                [Markdown Cheat Sheet] #Markdown
              
          

        

      

        

  

      

    
    

  1. 

    Markdown
markdown
    

    2. 

  2. 

    R markdown
rmarkdown
    

    3. 




  


  




    


          
    

      

        
        

          

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                ChengLuFred
                / **kwarg.md
            
            

              Last active
              June 21, 2020 03:22
            

              
                [Pass variable number of parameters] #Python
              
          

        

      

        

  

      

    
*args pass a list of values or variables


**kwarg(key words arguments) pass a dictionary


def test_args_kwargs(arg1, arg2, arg3):
    print("arg1:", arg1)
    print("arg2:", arg2)
    print("arg3:", arg3)

# test *args



  


  




    


          
    

      

        
        

          

              @ChengLuFred
          

          

            
                ChengLuFred
                / cheat sheet.md
            
            

              Last active
              June 21, 2020 02:30
            

              
                [Math Syntax in Latex] #Latex
              
          

        

      

        

  

      

    
<object data="http://yoursite.com/the.pdf" type="application/pdf" width="700px" height="700px">
    <embed src="http://yoursite.com/the.pdf">
        <p>This browser does not support PDFs. Please download the PDF to view it: <a href="http://yoursite.com/the.pdf">Download PDF</a>.</p>
    </embed>




  


  




    


          
    

      

        
        

          

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                ChengLuFred
                / file_manage_python.md
            
            

              Last active
              December 1, 2020 19:54
            

              
                [File Management in Python]file combine, zip extract, etc. #Python
              
          

        

      

        

  

      

    
1. Quick way to read file using pandas


file_name = 'file_name.csv'
tickers_info = pd.read_csv(file_name,
                           sep = ",",			 # ',' for csv file and '\t' for text file
						   header = 0,			 # row number used as head
                           usecols=[1, 2], 		 # column index to be included
                           index_col = [0], 	 # column index which apdated above
 engine='c') # c engine is faster than python