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R (programming language)

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BASIC INFORMATION R (open source language) is successor of S (proprietary language)  Like Python use # for comments Use Ctrl + Enter to run the current line OR select multiple lines and press Ctrl + Enter Ctrl + L to clear console in R studio How to print variable? use print(variable)   → CAN only print 1 object at a time OR select variable and hit Ctrl + Enter Put things in () to print while doing assigning (x < -  5)   → makes x=5 and prints x  x < -  5    → only makes x=5 Use View() for better visualisaion (for matrix or data frame) Variable name can have {letters, number, . , _ } But can start only with letter or . If printing multiple things on same line USE ; (semicolon) Eg.- a <- 10; b <- 20 Write (TRUE & FALSE) or (T & F) → but True or true are both wrong Can store string in " " or ' ' single-quoted strings can’t contain single quotes Similarly, double-quoted string can’t contain double quotes '...
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Latex + Matlab + Jupyter Notebook + Google Colab + Markdown

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Latex Where to edit  — Can be accessed online through the  “Overleaf”  website. File format  —  .tex \documentclass[]{article} --> Use \documentclass{...} to choose class \begin{document} use exam or beemer (for slides) instead of article ..... \end{document} use [] for Optional arguments -> eg- font size: [12pt] For title -> use \title{title_name} and Close title using \maketitle Packages  — load them right after  \documentclass : \usepackage{amsmath}  —  for equations \usepackage{graphicx}  —  to insert figures Equations & figures Use  \begin{equation} ... \end{equation}  inside body Figure skeleton: \begin{figure} \centering \includegraphics[width=\textwidth]{image_name} \caption{...} \end{figure} Paragraphs  — start new paragraph by  leaving an empty line Graphic adjustments \includegraphics[width=\textwidth]{image_name}  — scale to text...
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Random hacks

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Bank Tips Issue of Multi City Cheque books: Savings Bank (SB)  [leaf = 1 page in chequebook] For all Segments   - First 10 cheque leaves free in financial year But after that —  10 Leaf Cheque Book at ₹40/- + GST                              25 Leaf Cheque Book at ₹75/- + GST E mergency Cheque Book ₹50/-  + GST for 10 cheque leaves or part thereof S enior Citizen - Free Income Tax Tips TDS (Tax deducted at Source)  - amount cut and then send to employee (like me) Deductor = Company ........ Deductee = Salaried Employee (me) ........  Website TDS is deducted on base amount and not on GST  Eg - base amount = 100 → GST = 18 and TDS = 10% → 10 deducted If something is expense → TDS must be deducted (If not, then treated as income) Expense is like giving salary to employees or rent TAN number is issued by Income Tax department to deductor (like PAN issued to each individual) → compan...
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Business Analyst Terms + MS Excel + Tableau

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Data Analyst  -  uses technical skills to generate informative insights which helps in the decision-making processes. Key Skills - Data visualization, presentation skills, MS Excel, SQL, R or Python use data to find patterns and correlations + build models to see how data responds to his models. What is likely to happen in the future? + What do we need to do?  Business Analyst  -  uses knowledge + experience + insights generated by data analyst => take decisions that affect the business Key Skills: -  Critical thinking, Problem-solving, Communication and Process improvement, understand organization’s objectives and procedures to analyze performance, identify inefficiencies and propose and implement solutions.  They must have at least a working knowledge of the technology involved in analysis. presents conclusion of the final analyzed data set. What has happened? + What is happening right now? Advantage of data driven decision Risk assessment - ...
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Miscellaneous Tech

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Bitcoin resources   →   Youtube resource        Learning Bitcoin from CLI APK (Android Package Kit)  - file format used by Android to install apps has all components of app and packaged in single apk → code, resources, assets Like .exe are executables  on Windows → APKs are for Android Mod APK (Modified APK) - altered version of original Android app Sideloading - installing apps on device from sources other than official app store Used for apps not available on Play Store or for beta versions XAPK (extended Android package kit)  -  APK file + OBB files + graphics + media compressed for easy distribution of large apps / heavy games for android not officially supported by Android → special installers are needed Manually, users can extract XAPK and place OBB files in respective folder OBB (Opaque Binary Blob) files  - extra data files used by some Android apps to  store large assets like graphics, media files, ...
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Corporate Tips

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***************************   How to approach task   ********************* Understand the problem Objective - what are we solving (core issue) What already exists in system Make flowchart (HLD) on how you will be approaching what columns to be added in DB what functions to be made Confirm it with seniors on validity of approach Always think all aspects first before asking or connecting with seniors Make adjustments accordingly Think from your perspective also → if things seem off → think & question it If solving A, creates new task B → first tell situation to seniors and ask how to proceed → maybe B can be assigned to others or to you Divide whole problem into chunks → solve it level wise If have dependency with sales team or others → after completion of each chunk ask for confirmation and adjust code accordingly after each level At each level, stick to DRY create functions wherever possible to reuse it in future If major changes needed → better to create separate file and...
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