Tutorial by Examples: b

A common refrain in R goes along these lines: You should not have a bunch of related tables with names like DT1, DT2, ..., DT11. Iteratively reading and assigning to objects by name is messy. The solution is a list of tables of data! Such a list looks like set.seed(1) DT_list = lapply(setNam...

This attribute applies a version to the assembly. [assembly: AssemblyVersion("1.0.*")] The * character is used to auto-increment a portion of the version automatically every time you compile (often used for the "build" number)

Using .NET's rich reflection APIs, you can gain access to an assembly's metadata. For example, you can get this assembly's title attribute with the following code using System.Linq; using System.Reflection; ... Assembly assembly = typeof(this).Assembly; var titleAttribute = assembly.GetCust...

This example shows how a MongoDB collection can be displayed in a React component. The collection is continuously synchronized between server and client, and the page instantly updates as database contents change. To connect React components and Meteor collections, you'll need the react-meteor-data...

Publications can be merged on the client, resulting in differently shaped documents within a single cursor. The following example represents how a user directory might publish a minimal amount of public data for users of an app, and provide a more detailed profile for the logged in user. // client...

PMF FOR THE BINOMIAL DISTRIBUTION Suppose that a fair die is rolled 10 times. What is the probability of throwing exactly two sixes? You can answer the question using the dbinom function: > dbinom(2, 10, 1/6) [1] 0.29071 PMF FOR THE POISSON DISTRIBUTION The number of sandwhich ordered in ...

General Using the package RMySQL we can easily query MySQL as well as MariaDB databases and store the result in an R dataframe: library(RMySQL) mydb <- dbConnect(MySQL(), user='user', password='password', dbname='dbname',host='127.0.0.1') queryString <- "SELECT * FROM table1 t1 JO...

The module Better Buttons for GridField adds new form actions and buttons to the GridField detail form. Save and add another: Create a record, and go right to adding another one, without having to click the back button, and then add again Save and close: Save the record and go back to list view ...

The Dashboard module provides a splash page for the CMS in SilverStripe 3 with configurable widgets that display relevant information. Panels can be created and extended easily. The goal of the Dashboard module is to provide users with a launchpad for common CMS actions such as creating specific pag...

Chaining and Chainable is a design methodology used to design object behaviors so that calls to object functions return references to self, or another object, providing access to additional function calls allowing the calling statement to chain together many calls without the need to reference the v...

A class is also allowed to have static members, which can be either variables or functions. These are considered to be in the class' scope, but aren't treated as normal members; they have static storage duration (they exist from the start of the program to the end), aren't tied to a particular inst...

import std.stdio; void main() { writeln("Hello World!"); } Multiple imports can either be specified in the same line, separated with a comma or in a new line. import std.stdio, std.math; import std.datetime; void main() { writeln("2^4: ", pow(2, 4)); writ...

Modules can be exposed to other modules with public imports. public import std.math; // only exports the symbol 'pow' public import std.math : pow;

You can re-use a moved object: void consumingFunction(std::vector<int> vec) { // Some operations } int main() { // initialize vec with 1, 2, 3, 4 std::vector<int> vec{1, 2, 3, 4}; // Send the vector by move consumingFunction(std::move(vec)); // Here...

Assertions are used not to perform testing of input parameters, but to verify that program flow is corect -- i.e., that you can make certain assumptions about your code at a certain point in time. In other words: a test done with Debug.Assert should always assume that the value tested is true. Debu...

var pattern = createPattern(imageObject,repeat) Creates a reusable pattern (object). The object can be assigned to any strokeStyle and/or fillStyle. Then stroke() or fill() will paint the Path with the pattern of the object. Arguments: imageObject is an image that will be used as a patter...

The Python interpreter compiles code to bytecode before executing it on the Python's virtual machine (see also What is python bytecode?. Here's how to view the bytecode of a Python function import dis def fib(n): if n <= 2: return 1 return fib(n-1) + fib(n-2) # Display the disas...

CPython allows access to the code object for a function object. The __code__object contains the raw bytecode (co_code) of the function as well as other information such as constants and variable names. def fib(n): if n <= 2: return 1 return fib(n-1) + fib(n-2) dir(fib.__code__) de...

This example goes over how to set up CoreNLP from the GitHub repo. The GitHub code has newer features than the official release, but may be unstable. This example will take you through downloading, building, and running a simple command-line invocation of CoreNLP. Prerequisites: Java 8 or newer....

Get current date and time lib.date = TEXT lib.date { data = date:U strftime = %d.%m.%Y %H:%M:%S wrap = Today is | } Get last login time and date from fe_users lib.date = TEXT lib.date { data = TSFE:fe_user|user|lastlogin strftime = %d.%m.%Y %H:%M:%S wrap = Last logi...