Author Archives: Ajitesh Kumar
Learn R – How to Create Data Frame with Column Names
This article represents code in R programming language which could be used to create a data frame with column names. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: Create empty dataframe with column names Create non-empty dataframe with column names Create an Empty Dataframe with Column Names Following is the code sample: Following gets printed: Create non-empty Dataframe with Column Names Following is the code sample: Following gets printed. Note the column names such as “First Name” and “Age”
Learn R – How to Extract Rows & Columns from Data Frame
This article represents command set in R programming language, which could be used to extract rows and columns from a given data frame. When working on data analytics or data science projects, these commands come very handy in data cleaning activities. This article is meant for beginners/rookies getting started with R and wanting to know or see examples of extracting information from a data frame. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: Commands to extract rows and columns Command to extract a column as data frame Command …
Data Science – How to Load Data included with R
This article represents different ways in which data from different R packages could be loaded. One of the important aspect of getting on aboard with Data Science is to play with data as much as possible while one is going through the learning phase. When doing that, some of the key activities include data loading, data extraction, data wrangling/munging etc. This is where I found that loading data from different R packages is one of the key to get access to these data sets and hence, decided to write this quick article. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for …
ReactJS – Online Playground for JSX-HTML Expertise
This article represents quick introduction to online playground for JSX to HTML conversion and vice-versa. Very handy for those, especially the Javascript beginners, to get a hang on component-oriented programming related with ReactJS which is at the heart of it. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: HTML to JSX Compiler JSX to HTML Compiler Following are two online tool or playground to enhance familiarity with JSX. HTML to JSX Compiler: This Online playground for HTML-JSX compiler would help you to write HTML on one end, …
AngularJS – How to Handle XSS Vulnerability Scenarios
This article represents different scenarios related with XSS (cross-site scripting) and how to handle them appropriately using AngularJS features such as SCE ($sceProvider) and sanitize service ($SanitizeProvider). Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Do visit the page, how to prevent XSS attacks in Angular 2.*, Angular 4.* or Angular 5.*, if you are looking forward for handling XSS vulnerabilities in latest version of Angular apps. You may also want to check the page, Top 10 Angular Security Best Practices vis-a-vis vulnerability issues. Following are the key XSS-related scenarios described later in this article: Escape HTML completely …
AngularJS – Two Ways to Initialize an Angular App
This article represents code samples along with related concepts for two different ways in which Angular app can be defined. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: Automatic Initialization Manual Initialization Automatic Initialization All that is needed for automatic initialization (as of current AngularJS version) is to define “ng-app” on an element and you should be all set. Take a look at following code sample. Pay attention to some of the following: ng-app=”HelloApp” defined on div element ng-controller=”HelloCtrl” defined on the same element. It could as …
Machine Learning – How to Predict Software Developers Productivity
This article represents my thoughts on how machine learning techniques could be used to solve one of the most popular problem of software industry such as whether a software developer is productive or not. Of all the effort that I have made to solve this problem using traditional programming techniques (rules-based), I could say that there is no definitive way of finding a concrete solution. As a matter of fact, I created a tool, AgileSQM to capture the software quality metrics (SQM) such as code coverage, duplication, complexity and infer from the trending data whether a software developer is productive. However, I soon hit the road-block in terms of acceptance …
Java – Top 10 Java-based Web Frameworks for 2014-2015
This article represents an analysis on Java-based web frameworks that emerged in the top 10 list this year 2014, and worth consideration for your next project starting this year or next year (2015). I have done data analysis based on following: Job openings (as of today) on a very popular website, indeed.com Discussion threads (for this year) on a very popular Q&A based website, stackoverflow.com Responses on a very popular social bookmarking website, reddit.com Based on the analysis of top 10 frameworks, I have listed the top 5 frameworks which emerged as clear winner. Please feel free to comment/suggest if I missed to mention one or more important frameworks. Also, …
How to use Sonar Dashboard to Report on Software Code Quality
This article represents methods one could adopt to read the sonar dashboard and gather data appropriately to monitor and control the software code quality. The primary reason why I am writing this blog is the fact that I have come across several team leads who asked me the questions related with data on sonar dashboard and what all they could do with it. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are three different aspects of software quality which could be tracked using Sonar Dashboard: Maintainability (testability, reusability & modularity) Usability (readability and understand-ability) Security Following are …
Productivity – Top 3 Javascript IDEs/Text Editors to Consider
This article represents the top 3 Javascript IDE/Text Editors that you may want to explore for your next project for Javascript related development. The way the top 3 editors are chosen is the number of votes (thumbs up) given by different users in one of the Javascript IDE/Text Editor related discussion thread on one of the very popular social bookmarking website, as of today. Interestingly, newer editors such as Brackets and Atom are catching attention of some of the users. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are different Javascript Text Editors (at times, also called …
Data Science – Examples of Machine Learning Problems
This article represents different classification of machine learning problems along with some of the examples taken from real world problems. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following is listed different categories which covers 80% of machine learning problems: Classification Clustering Regression Machine Learning – Classification Problems Simply speaking, if the answer to problems consists of discrete values such as some of the following, the problem can be termed as classification problems. These are called as “Logistic Regression” problems. Yes or no,. e.g., 1 or 0. Finite set of values representing multi-classification problems Mathematically speaking, if “h(x)” …
Top 7 Data Science Subreddits to Follow
This article represents top subreddits related with Data Science on reddit.com that the Data Science aspirants or professionals could watch on regular basis for news, stories and discussions. Generally, I find reddit.com very useful to remain in touch with latest and interesting stories and keep myself up-to-date. For those unaware of what is subreddit, subreddit, simply speaking, represents the topic-based groups on reddit.com that comprise of users who want to publish/discuss news or stories related with that topic. For data science, there are multiple groups each focused on a single topic such as those mentioned below. Please feel free to comment/suggest if I missed to mention one or more important …
Javascript Frameworks Job Pattern with IT Companies in India
This article represents my analysis on job patterns vis-a-vis javascript frameworks with IT companies in India. This may also be read as a pattern of adoption of JS frameworks by developers community with IT companies in India. The analysis has been done based on number of job openings related with below listed JS frameworks, posted last month e.g., octobar 2014, on one of the topmost job portal catering to Indian IT market. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are top 7 javascript frameworks which are most seeked after skillsets in potential UI related candidates, from …
AngularJS – Top 6 Concepts That Developers Loved
This article represents top 6 popular AngularJS topics that has been used most by the AngularJS developer community till date. The inference is derived based on number of tagged discussions happening on Stackoverflow. Clearly, “Directive” is the winner and attracts most of them all. The article presents my thoughts on why these topics have been most popular. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following is the list of top 6 popular topics: Directives Scope Object Ng-repeat Angular UI & Bootstrap Routing Service Following plot demonstrates the popularity of different feature/topics in relation with AngularJS. …
Data Science – Quick Start Guide for Machine Learning
This article represents a very high-level information on different aspects of machine learning with an objective to present a quick-start read/guide for the data science beginners. One could grab one or more books on Machine Learning to learn the subject in detail. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: What is machine learning? Key phases of machine learning Prediction API model of machine learning What is Machine Learning? Simply speaking, Machine Learning is a set of artifical intelligence techniques which are used to solve one of …
Data Scraping – Top 5 Reasons for using Import.io Tool
This article represents my thoughts on why one would want to use this web data scraping tool, named as import.io. I must say that I am glad I found this tool for data scraping. Please feel free to comment/suggest if I missed to mention one or more important points. Also, sorry for the typos. Following are the key points described later in this article: Key aspects of Import.io Reasons Why One Must Try Import.io for their next Data Scraping Project Use-cases where Import.io scraping tool could be used Key Aspects of Import.io Tool Import.io is a cloud-based web scraping tool which could act as a boon for those looking …
I found it very helpful. However the differences are not too understandable for me