• Introduction to Exploratory Data Analysis in Python

      Recently I finished up Python Graph series by using Matplotlib to represent data in different types of charts. In this post I am giving a brief intro of Exploratory data analysis(EDA) in Python with help of pandas and matplotlib. What is Exploratory data analysis? According to Wikipedia: In statistics, exploratory data analysis (EDA) is an approach to analyzing data sets to summarize their main characteristics, often with visual methods. A statistical model can be used or not, but primarily EDA is for seeing what the data can tell us beyond the formal modeling or hypothesis testing task. You can say that EDA is statisticians way of story telling where you explore…

  • Develop your first python app integrated with decentralized Stellar network

    In this post I am going to discuss how to create a decentralized blockchain app aka dApp for Stellar Network. I will build a very simple web app, world’s simplest Ecommerce app, called it RocketCommerce where people can buy a single item by paying Lumens(XLM), stellar’s currency. The interface of the app looks like below: Before we get into the development of the application itself, allow me to discuss some background of Blockchain, decentralized apps and Stellar Network itself. What is Blockchain? From Wikipedia: A blockchain, originally block chain is a continuously growing list of records, called blocks, which are linked and secured using cryptography.[1][6] Each block typically contains a cryptographic hash of the previous block,[6] a timestamp and transaction data.[7] By design, a…

  • 2017 in numbers

      Credits   2017 is almost over. This year was very exciting in terms of taking initiatives in different aspects of life. I resumed technical blogging, create more open source work and starting video tutorials. Actually it all started when I resumed blogging on this very blog and created a post that became massive hit and made me to continue blogging. BTW I am not new into writing. I had a technical blog back in 2003 where I used to share different things. I had another blog where I used to share the other side of me, that is about politics, religion and current affairs. I am happy to say…

  • Data Visualization in Python – Subplots in Matplotlib

    In this post I am going to discuss a Matplotlib feature which let you add multiple plots within a figure called subplots. Subplots are helpful when you want to show different data presentation in a single view, for instance Dashboards. There are multiple ways you can create subplots but I am here going to discuss the one which let you add graphs in grids by using subplot2grid method. subplot2grid takes two mandatory parameters, the first one is size and the next is location. A typical subplot2grid call will look like below: ax = plt.subplot2grid((2, 2), (0, 0)) The first parameter is the size that is a 2 x 2 grid, the 2nd is…

  • Data Visualization in Python – Pie charts in Matplotlib

    In last post I discussed scatter, today I am going to discuss Pie charts. What are Pie Charts? An Emma chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented. The earliest known pie chart is generally credited to William Playfair’s Statistical Breviary of 1801.[1][2]   Pie charts are good to show proportional…

  • Data Visualization in Python – Scatter plots in Matplotlib

    In last post I talked about plotting histograms, in this post we are going to learn how to use scatter plots with data and why it could be useful. What is Scatter Plot? From Wikipedia: A scatter plot (also called a scatterplot, scatter graph, scatter chart, scattergram, or scatter diagram)[3] is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data. If the points are color-coded, one additional variable can be displayed. The data are displayed as a collection of points, each having the value of one variable determining the position on the horizontal axis and the value…

  • Data Visualization in Python – Histogram in Matplotlib

      In the last post I talked about bar graphs and their implementation in Matplotlib. In this post I am going to discuss Histograms, a special kind of bar graphs. What is Histogram? From Wikipedia A histogram is an accurate graphical representation of the distribution of numerical data. It is an estimate of the probability distribution of a continuous variable (quantitative variable) and was first introduced by Karl Pearson. It is a kind of bar graph. To construct a histogram, the first step is to “bin” the range of values—that is, divide the entire range of values into a series of intervals—and then count how many values fall into each…

  • Data Visualization in Python – Bar Graph in Matplotlib

      In last post I covered line graph. In this post I am going to show how to draw bar graph by using Matplotlib. Bar Graph What is bar graph? According to Wikipedia A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally.    So in short, bar graphs are good if you to want to present the data of different groups that are being compared with each other. For this post I have picked the data of movies genres released from 1995-2017. The source of data is here. [crayon-5c15ec6852b2a663129600/] I take two lists, label and…

  • Data Visualization in Python – Line Graph in Matplotlib

      I recently covered data gathering via scraping. Now I am going to cover how the data can be visualized. The best way to do is to plot graphs. Graphs makes it easier to see the relation between a data variable with other. There are various kinds of graphs available: Line, Bar, Chart, Histogram etc. Since we are dealing in Python, it provides a very good library for plotting cool graphs. It’s called Matplotlib. From the Official Site: Matplotlib is a Python 2D plotting library which produces publication quality figures in a variety of hardcopy formats and interactive environments across platforms. Installation The best way to install it by using…

  • Structures and Methods in Go

    In this post I am going to discuss Go lang’s another features, structs As I told earlier that Go is not a typical Object Oriented Language. Structures is kind of answers of what you do with Classes and objects. Well, Structure is not a special concept to Go only. If you have worked on C language then you could have an idea what is it all about. Let’s write a simple program [crayon-5c15ec6853258686555627/] Ok this is the complete program. After typical declarations I am defining a struct with name person. As you remember you write variable name first and then it’s type in Go. Alright.. so now we have to use…