Tutorial by Examples: p

Create a group of checkboxes that can be used to toggle multiple choices independently. The server will receive the input as a character vector of the selected values. library(shiny) ui <- fluidPage( checkboxGroupInput("checkGroup1", label = h3("This is a Checkbox group&...

Types can represents various kind of things. It can be a single data, a set of data or a function. In F#, we can group the types into two categories.: F# types: // Functions let a = fun c -> c // Tuples let b = (0, "Foo") // Unit type let c = ignore // Records...

1. Add Devise Gem Open up your Gemfile and add this line gem 'devise' Then run; bundle install 2. Set up devise in your app Run the following command in the terminal rails g devise:install 3. Configure Devise Ensure you have defined default url options in your environments files. Open...

In order to ssh into a server your identity's public key has to be added to the list of trusted keys. Most commonly this is done per-user: ssh-copy-id -i ~/.ssh/<identity>.pub <user>@<hostname> Which can be also done manually: cat ~/.ssh/<identity>.pub | ssh <user>...

Many people don't make use of file.path when making path to a file. But if you are working across Windows, Mac and Linux machines it's usually good practice to use it for making paths instead of paste. FilePath <- file.path(AVariableWithFullProjectPath,"SomeSubfolder","SomeFileNam...

The following function is returning another function as its result which can be later assigned to a variable and called: func jediTrainer () -> ((String, Int) -> String) { func train(name: String, times: Int) -> (String) { return "\(name) has been trained in the Force \(times)...

Every function has its own function type, made up of the parameter types and the return type of the function itself. For example the following function: func sum(x: Int, y: Int) -> (result: Int) { return x + y } has a function type of: (Int, Int) -> (Int) Function types can thus be use...

Every object in R is assigned a class. You can use class() to find the object's class and str() to see its structure, including the classes it contains. For example: class(iris) [1] "data.frame" str(iris) 'data.frame': 150 obs. of 5 variables: $ Sepal.Length: num 5.1 4.9 4.7 4...

Problem: When you use many labels inside a view, you maybe get a warning: How can we fix this warning? Solution: We calculate and set the priorities in order. The priorities must be different from labels. It means which is important will get higher priority. For example, in my case, I set the ve...

import javax.ws.rs.FormParam; import javax.ws.rs.POST; import javax.ws.rs.Path; import javax.ws.rs.core.Response; @Path("hello") public class HelloWorldResource { @POST @Path("/receiveParams") public Response receiveHello(@FormParam("name") String ...

Often data comes in tables. Generally one can divide this tabular data in wide and long formats. In a wide format, each variable has its own column. PersonHeight [cm]Age [yr]Alison17820Bob17445Carl18231 However, sometimes it is more convenient to have a long format, in which all variables are in o...

In this exercise, we will generate four bootstrap linear regression models and combine the summaries of these models into a single data frame. library(broom) #* Create the bootstrap data sets BootData <- lapply(1:4, function(i) mtcars[sample(1:nrow(mtcars), ...

This example shows how PLINQ can be used to calculate the even numbers between 1 and 10,000 using multiple threads. Note that the resulting list will won't be ordered! var sequence = Enumerable.Range(1, 10000); var evenNumbers = sequence.AsParallel() .Where(x => x % 2...

The degree of parallelism is the maximum number of concurrently executing tasks that will be used to process the query. var sequence = Enumerable.Range(1, 10000); var evenNumbers = sequence.AsParallel() .WithDegreeOfParallelism(4) .Where(x =&gt...

Derives from Object Key members public Dispatcher Dispatcher { get; } Summary Most objects in WPF derive from DispatcherObject, which provides the basic constructs for dealing with concurrency and threading. Such objects are associated with a Dispatcher. Only the thread that the Dispatcher w...

Derives from DispatcherObject Key members public object GetValue(DependencyProperty dp); public void SetValue(DependencyProperty dp, object value); Summary Classes derived from DependencyObject participate in the dependency property system, which includes registering dependency properties ...

In case your activities, fragments and UI require some background processing a good thing to use is a MockWebServer which runs localy on an android device which brings a closed and testable enviroment for your UI. https://github.com/square/okhttp/tree/master/mockwebserver First step is including t...

As Angular uses HTML to extend a web page and plain Javascript to add logic, it makes it easy to create a web page using ng-app, ng-controller and some built-in directives such as ng-if, ng-repeat, etc. With the new controllerAs syntax, newcomers to Angular users can attach functions and data to the...

This is the basic HTML file that can be used as a boilerplate when starting a project. This boilerplate uses orbit controls with damping (camera that can move around an object with deceleration effect) and creates a spinning cube. <!DOCTYPE html> <html> <head> <t...

public function drawDisplayObjectUsingBounds(source:DisplayObject):BitmapData { var bitmapData:BitmapData;//declare a BitmapData var bounds:Rectangle = source.getBounds(source);//get the source object actual size //round bounds to integer pixel values (to aviod 1px str...