SEARCH KEYWORD -- BIG DATA
Write Your Own R Packages
Introduction A set of user-defined functions (UDF) or utility functions are helpful to simplify our code and avoid repeating the same typing for daily analysis work. Previously, I saved all my R functions to a single R file. Whenever I want to use them, I can simply source the R file to import all functions. This is a simple but not perfect approach, especially when I want to check the documentation of certain functions. It was quite annoying that you can’t just type ?func&n...
DATA SCIENCE,R PROGRAMMING,DATA ENGINEERING 2019-10-19 07:20:52
Show Bootstrap tooltip in AngularJS ng-repeat elements
In contemporary web application development, many front-end frameworks have been used to accelerate the speed of development and circumvent browser compatibility issues. Among them, AngularJS and Bootstrap are two frequently used. AngularJS is a MVC JavaScript framework developed by Google to provide easy synchronization between user view and data model. While Bootstrap is developed by Twitter and it eases the work of designing a simple and concise UI without much manual design work ...
My ten development principles
After several years developing software, I have acquired a very a strong opinion on how software should be developed, I actually have come to the conclusion that everything boils down to 10 principles, that if well implemented, will make any software development successful. 1.- Customer first. “If we don’t take care of the customer… somebody else will.†Customer first means focusing from a customer perspective on real value for the product being developed,...
Principle,Software,Development,Communica 2011-08-15 07:28:55
Many Chinese applicants to US universities may be affected by Gmail cut out
Just after Christmas, many Chinese found that they could not connect to Gmail anymore in mainland China. Since Google announced leaving from China in 2010, the web version of Gmail was not accessible anymore. But people from China could still access Gmail through some Gmap apps. This time, Gmail is not accessible even with these apps. It is said that all the mail service protocols of Gmail including IMAP/POP/SMTP have been cut out by Chinese government. This means no mails can be sent to or rece...
Gmail, China, Gmail cut out 2014-12-30 00:35:28
File System vs Core Data: the image cache test
Code for this project is on GitHub While doing a full re-write of Droplr's iOS app for the 2.0 launch, I couldn't find any good file/image caches out there had a particular feature I really wanted: extending item expiration whenever it's touched. I set out to write my own — which wasn't that much of a challenge — but somewhere along the process I had this crazy idea that perhaps (SQLite-backed) Core Data would be a much better tool for the job: No mismatch between cache index ...
File system.Image cache,Multimedia 2012-02-01 08:52:02
Create wireless hotspot on your smartphone
It's now very common that you may not get Internet connection in first few days when you move to a new place. And you may have some important things to handle or you may just want to connect to Internet and share with others your new place. If you have a smartphone which has enough mobile data package, then you are on the way to enjoy Internet. Today we will introduce how to create a wireless hotspot on your smartphone with Samsung Galaxy S3 i9300. Step 1 Go to Settings -> More Settings ->...
Wireless hotspot, Smartphone, Samsung 2013-01-12 23:08:39
Understanding GoLang interface
If goroutine and channel are considered as the foundation for GoLang concurrency, interface would be the key for data types in GoLang. In practical Go programming, almost all data types are built/used around interfaces, interface is the core of GoLang data structures. Go is not a typical OOP language, it has no class and inheritance concept syntactically. But it doesn't mean that there cannot be polymorphism in GoLang. Because of interface, it achieves the same polymorphism effect as in C++, tho...
Learning Python as your first programming language
Python is a widely used general-purpose, high-level programming language Its design philosophy emphasizes code readability, and its syntax allows programmers to express concepts in fewer lines of code than would be possible in languages such as C. Python now becomes more and more popular and is now being used the first teaching language in some universities. Why would you like to learn Python as your first programming language? Below are the reasons. Python is a high-level language with dynami...
Opinion: The Elusive 'Quick Iteration' - Tips for Indie Devs
[In this reprinted #altdevblogaday-opinion piece, WB Games/Kindling Games' Kristen Bornemann offers independent developers advice on iterating and shipping their projects as fast as possible.] From agile and scrum to extreme programming, everyone's trying to nail down what it takes to iterate on products quickly and efficiently. There are a lot of methodologies that you can employ to guide you through shipping products. But today, I'll be talking specifically about video games and how, as a...
Game,Electronic,Efficient,Development me 2011-08-15 07:41:47
ConcurrentHashMap vs Collections.synchronizedMap()
ConcurrentHashMap and Collections.synchronizedMap() both provide thread-safe operations of collections of data. They are used in multithreaded programs to provide both thread safety and performance improvements. In many cases, we can use either of them. But the realization of thread safety is different for these two implementations. ConcurrentHashMap will create an HashEntry[] array internally to store the elements passed in from a Map, while Collections.synchronizedMap() will return a Synchroni...
ConcurrentHashMap,Collections.synchronizedMap 2014-09-18 05:04:59
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