Tutorial by Examples: r

In our last two examples, numpy assumed that a[0,:] was the first vector, a[1,:] the second, and a[2,:] the third. Numpy.cross has an optional argument axisa that allows us to specify which axis defines the vectors. So, >>> a=np.array([[1,1,1],[0,1,0],[1,0,-1]]) >>> b=np.array([0...

Required JARs on classpath: javax.money:money-api:1.0 (JSR354 money and currency api) org.javamoney:moneta:1.0 (Reference implementation) javax:annotation-api:1.2. (Common annotations used by reference implementation) // Let's create non-ISO currency, such as bitcoin // At first, t...

Using named ranges allows you to describe the meaning of a cell(s) contents and use this defined name in place of an actual cell address. For example, formula =A5*B5 can be replaced with =Width*Height to make the formula much easier to read and understand. To define a new named range, select cell ...

Create new named range called ‘MyRange’ assigned to cell A1 ThisWorkbook.Names.Add Name:="MyRange", _ RefersTo:=Worksheets("Sheet1").Range("A1") Delete defined named range by name ThisWorkbook.Names("MyRange").Delete Access Named Range by name...

Formulas tab > Defined Names group > Name Manager button Named Manager allows you to: Create or change name Create or change cell reference Create or change scope Delete existing named range Named Manager provides a useful quick look for broken links.

A natural division is simply to make one topic for each language feature. For instance, Python has: Classes Functions Generators Decorators . . . On the downside, features can be quite complicated and it's easy to come up with many more examples than make sense for a single page. Classes h...

Example sheet Code Sub Example() Dim wks As Worksheet Set wks = ThisWorkbook.Worksheets("Sheet1") Dim units As Range Set units = ThisWorkbook.Names("Units").RefersToRange Worksheets("Sheet1").Range("Year_Max").Value =...

BatchBashDescriptioncommand /?man commandShows the help for commandbitsadminwget or curlDownloads a remote filecertutil -hashfile file_name MD5md5sum file_nameGets the MD5 checksum of file_namecdpwdDisplays the current directorycd directorycd directoryChanges the current directory to the specified o...

BatchBashDescription%variable%$variableA regular variable!variable!$variableA variable inside of a code block when setlocal enabledelayedexpansion is on%errorlevel% or ERRORLEVEL$?Returns the status of the previous command: 0 if successful, 1 (or something else) if not%1, %2, %3, etc.$1, $2, $3, etc...

Using immutable locals: Uses less horizontal space but more vertical space than the "anonymous temporaries" template. Preferable over the "anonymous temporaries" template if the when expression is in a loop--in that case, regex definitions should be placed outside the loop. im...

The static factory method is a variation of the factory method pattern. It is used to create objects without having to call the constructor yourself. When to use the Static Factory Method if you want to give a meaningfull name to the method that generates your object. if you want to avoid over...

Implementing the Behavior This behavior will cause mouse wheel events from an inner ScrollViewer to bubble up to the parent ScrollViewer when the inner one is at either its upper or lower limit. Without this behavior, the events will never make it out of the inner ScrollViewer. public class Bubbl...

Smarty templating engine for PHP lets easily separate application logic and presentation, the first being in PHP code and the other generally, but not always, in HTML. That way a separation of PHP and HTML code is encouraged. Currently two versions of Smarty are maintained smarty2 for legacy purpos...

When a method is defined to be a macro, the compiler takes the code that is passed as its argument and turns it into an AST. It then invokes the macro implementation with that AST, and it returns a new AST that is then spliced back to its call site. import reflect.macros.blackbox.Context object ...

Macros can trigger compiler warnings and errors through the use of their Context. Say we're a particularly overzealous when it comes to bad code, and we want to mark every instance of technical debt with a compiler info message (let's not think about how bad this idea is). We can use a macro that d...

Declare @userList Table(UserKey VARCHAR(60)) Insert into @userList values ('bill'),('jcom'),('others') --Declared a table variable and insert 3 records Declare @text XML Select @text = ( select UserKey from @userList for XML Path('user'), root('group') ) --Set the XML value from ...

Some topics are loosely associated examples under a theme, such as C# 6.0 Features and Common pitfalls. On the whole, this style of topic has been discouraged since examples per topic were limited as there's no natural place to stop adding content. It's probably better to move the examples to anoth...

CREATE TABLE mytable (number INT); INSERT INTO mytable VALUES (1); CREATE MATERIALIZED VIEW myview AS SELECT * FROM mytable; SELECT * FROM myview; number -------- 1 (1 row) INSERT INTO mytable VALUES(2); SELECT * FROM myview; number -------- 1 (1 row) REFRESH ...

Java code: public class StdioApplication { public static void main(String[] args) { new ClassPathXmlApplicationContext("classpath:spring/integration/stackoverflow/stdio/stdio.xml"); } } Xml config file <?xml version="1.0" encoding="UTF-8"?&...

This example demonstrates how to develop a simple UWP application. On creation of a "Blank App (Universal Windows)" project there are many essential files that are created in your solution. All files in your project can be seen in the Solution Explorer. Some of the crucial files in your...