Building Web apps with R Language - Part 1

 R language is open source with a huge number of developers. It has a great arsenal of great stuff already accomplished. It is a language that you should get exposed to yourself. You just install R Gui and you are ready.


Shiny is an enterprise-grade web application framework targeted for those who want to develop with R using the familiar HTML5, CSS and JavaScript. Using R you can turn terrific analytic solutions you have developed/developing into interactive web applications.

Go to this site (https://shiny.rstudio.com/) directly and learn more.

 
Rshiny-00

If you have R Studio you have Shiny because Shiny is a package that you can download.

In this first part we only talk about the very basics.

I assume you have read my previous hands-on R examples in my blogs.

http://hodentekhelp.blogspot.com/2015/09/what-is-good-way-to-learn-r-language.html
http://hodentekhelp.blogspot.com/search?q=R+language

Here I just show a very basic (aka Hello World) example of creating content for a web page using R GUI. More will come later in my blogs.

Launch R Gui as shown and provide reference to the shiny "library" as shown by typing in the three lines of code (The four lines of code in red).


 HelloWorld_00

When you hit Enter after the third line where you define the shiny app, a browser window will open as shown displaying the apps output as shown at a port of the local host.



HelloWorld_01

You also get a response (the last line) in the R GUI as shown.




HelloWorld_02
That is all there is to create a content.

The ui summarizes your user interface, the server is something like a web server and shinyApp is your web response. No fuss, very simple.

Comments

Post a Comment

Popular posts from this blog

Towards cross-platform development..

There are lots and lots of Apps. In fact there are over a couple of million Apps including all of the major brands, Apple, Google, Blackberry, Microsoft with Apple at the top and Microsoft in the bottom. But this is a growing market. The variety is truly bewildering, different size devices; different operating systems(OS); different programming languages;  and different orientations. This post is not very recent but you can see how the various mobile operating systems compare: http://www.ibtimes.com/android-vs-ios-whats-most-popular-mobile-operating-system-your-country-1464892 The interactive image in the article really shows the popularity of a given OS/device among different geographical regions. Windows Phone Apps is for example based on Microsoft's Window 7, 8, 8.1 OSs using .NET. With Windows OS and Visual Studio one can build Apps for all of Microsoft devices covering Phone, Tablet and Desktop. However Microsoft Windows Apps sans Html5/CSS/Javascript is OS specific. E
Read more

Event Code: UI design with XAML in Visual Studio 2017 - 2

Image
I assume you have followed me with this post here: http://hodentekhelp.blogspot.com/2017/12/how-do-i-configure-button-in-xaml.html After reading the above you will see that you start with an empty project whose code is shown here: WinPhoneStep1 In the final step you will have achieved this: WinPhoneStep11 This project when deployed will just show a button as in the above and nothing more: WinPhoneStep13 Writing code for a click event of this button. Let us first give a name for this button, like ClickMe . When you highlight the button in the design by clicking it, the Property pane opens where you can write the name you want as shown. winPhoneStep20 In the XAML code the Button gets a qualifier x:Name="ClickMe" as shown here: Now enter the Click event to the code by just enter "cl" after a space as shown and the intellisense kicks-in showing your options as shown. winPhoneStep22.png You pi
Read more

Deploying a Universal Windows Project to Lumia 950

Image
We will be using the Lumia 950 as the connected device and it has been set to Developer Mode as described earlier. We start with the HelloWorld Universal Windows Project(UWP) that has been tested to run without errors on the Local Machine as described here. Open the project in Visual Studio 2017 as shown. LumiaDeploy_0 and LumiaDeploy_7 Build (Using Menu Build and its context menu) the Project and verify it is successful. -------- 1>------ Build started: Project: HelloWorld, Configuration: Debug x86 ------ 1>  HelloWorld -> C:\Users\Owner\source\repos\HelloWorld\HelloWorld\bin\x86\Debug\HelloWorld.exe ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ===== ------------------ Click Local Machine along Debug as shown. LumiaDeploy_1 Pick Device from the list, the display changes as shown. LumiaDeploy_2 Connect your Windows 10 Mobile(Lumia 950) to one of the USB ports. This will result in an
Read more