Tutorial by Examples: t

The X-macro approach can be generalized a bit by making the name of the "X" macro an argument of the master macro. This has the advantages of helping to avoid macro name collisions and of allowing use of a general-purpose macro as the "X" macro. As always with X macros, the mas...

There are three ways of creating a new branch feature which tracks the remote branch origin/feature: git checkout --track -b feature origin/feature, git checkout -t origin/feature, git checkout feature - assuming that there is no local feature branch and there is only one remote with the featur...

The class name selector select all elements with the targeted class name. For example, the class name .warning would select the following <div> element: <div class="warning"> <p>This would be some warning copy.</p> </div> You can also combine class n...

ID selectors select DOM elements with the targeted ID. To select an element by a specific ID in CSS, the # prefix is used. For example, the following HTML div element… <div id="exampleID"> <p>Example</p> </div> …can be selected by #exampleID in CSS as sho...

Text prefixed with one to six pound signs (hash symbols, #) becomes a header <h1> through <h6>, according to how many pound signs were used. # This is a first-level (`<h1>`) header ## This is a second-level (`<h2>`) header ### And so on. This is a first-level (<h1&...

Characters for bulleted lists: * Asterisks + Plus signs - Minus signs Characters for bulleted lists: Asterisks Plus signs Minus signs Please note: For the best results you have to use the same character because as you can see in the example below different signs make the list ...

1. Lists can be nested * Four spaces - Eight spaces + Twelve spaces 2. And back Lists can be nested Four spaces Eight spaces Twelve spaces And back

In this example we are going to plot multiple lines onto a single axis. Additionally, we choose a different appearance for the lines and create a legend. % create sample data x = linspace(-2,2,100); % 100 linearly spaced points from -2 to 2 y1 = x.^2; y2 = 2*x.^2; y3 = 4*x.^2; ...

Creating an empty table is as simple as this: local empty_table = {} You can also create a table in the form of a simple array: local numeric_table = { "Eve", "Jim", "Peter" } -- numeric_table[1] is automatically "Eve", numeric_table[2] is "Ji...

A database snapshot is a read-only, static view of a SQL Server database (the source database). It is similar to backup, but it is available as any other database so client can query snapshot database. CREATE DATABASE MyDatabase_morning -- name of the snapshot ON ( NAME=MyDatabase_data, -- l...

If data in a source database becomes damaged or some wrong data is written into database, in some cases, reverting the database to a database snapshot that predates the damage might be an appropriate alternative to restoring the database from a backup. RESTORE DATABASE MYDATABASE FROM DATABASE_SNAP...

docker run hello-world This will fetch the latest hello-world image from the Docker Hub (if you don't already have it), create a new container, and run it. You should see a message stating that your installation appears to be working correctly.

docker run docker/whalesay cowsay 'Hello, StackExchange!' This command tells Docker to create a container from the docker/whalesay image and run the command cowsay 'Hello, StackExchange!' in it. It should print a picture of a whale saying Hello, StackExchange! to your terminal. If the entrypoin...

Normally, a Docker container persists after it has exited. This allows you to run the container again, inspect its filesystem, and so on. However, sometimes you want to run a container and delete it immediately after it exits. For example to execute a command or show a file from the filesystem. Dock...

In this example we will write a basic program that checks the number of inputs and outputs passed to a MEX-function. As a starting point, we need to create a C++ file implementing the "MEX gateway". This is the function executed when the file is called from MATLAB. testinputs.cpp // Mat...

git add -i (or --interactive) will give you an interactive interface where you can edit the index, to prepare what you want to have in the next commit. You can add and remove changes to whole files, add untracked files and remove files from being tracked, but also select subsection of changes to put...

There are several ways to set which editor to use for committing, rebasing, etc. Change the core.editor configuration setting. $ git config --global core.editor nano Set the GIT_EDITOR environment variable. For one command: $ GIT_EDITOR=nano git commit Or for all commands run in a ...

SELECT * FROM Employees WHERE ManagerId IS NULL This statement will return all Employee records where the value of the ManagerId column is NULL. The result will be: Id FName LName PhoneNumber ManagerId DepartmentId 1 James Smith 1234567890 NULL 1 SEL...

Alt-text is used by screen readers for visually impaired users and by search engines. It's therefore important to write good alt-text for your images. The text should look correct even if you replace the image with its alt attribute. For example: <!-- Incorrect --> <img src="anonymo...

An std::map takes (key, value) pairs as input. Consider the following example of std::map initialization: std::map < std::string, int > ranking { std::make_pair("stackoverflow", 2), std::make_pair("docs-beta", 1) }; In an std::...