Tutorial by Examples: a

The size of a set can be determined using the SCARD command. SCARD will return the cardinality of a set or the number of members in the set. For example, if I had a Redis set my_set stored in the database that looked like (Apple, Orange, Banana), I could get the size using the following code: SCA...

The basic Redis command for adding an item to a set is SADD. It takes a key and one or more members and adds them to the set stored at the given key. For example, lets say that I wanted to create a set with the items apple, pear and banana. I could execute either of the following: SADD fruit app...

Redis provides the ZADD command to add items to a sorted set. The basic form of the ZADD command is to specify the set, the item to add and it's score. For example, if I wanted to construct an ordered set of my favorite food (from least to most), I could use either of: zadd favs 1 apple zadd fav...

The size of a Redis list can be deterimed using the LLEN command. If I have a four element list stored at the key my_list, I can get the size using: LLEN my_list which will return 4. If a user specifies a key that doesn't exist to LLEN, it will return a zero, but if a key is used that points t...

Redis provides seven different operations for working with scripts: Eval operations (EVAL, EVALSHA) SCRIPT operations (DEBUG, EXISTS, FLUSH, KILL, LOAD) The EVAL command evaluates a script provided as a string argument to the server. Scripts can access the specified Redis keys named as argum...

/** * Resizes an image using a Graphics2D object backed by a BufferedImage. * @param srcImg - source image to scale * @param w - desired width * @param h - desired height * @return - the new resized image */ private BufferedImage getScaledImage(Image srcImg, int w, int h){ //Cre...

The simpler way to use Bash in Windows is to install Git for Windows. It's shipped with Git Bash which is a real Bash. You can access it with shortcut in : Start > All Programs > Git > Git Bash Commands like grep, ls, find, sed, vi etc is working.

Be aware that the WebBrowser control is not sympathetic to your XAML definition, and renders itself over the top of other things. For example, if you put it inside a BusyIndicator that has been marked as being busy, it will still render itself over the top of that control. The solution is to bind th...

Since we have many different algorithms to choose from, when we want to sort an array, we need to know which one will do it's job. So we need some method of measuring algoritm's speed and reliability. That's where Asymptotic analysis kicks in. Asymptotic analysis is the process of describing the ef...

g + geom_bar(aes(x = cut, fill = color), position = "fill") + guides(fill = guide_legend(title = NULL))

g + geom_bar(mapping = aes(x = cut, fill = clarity), position = "dodge") + theme(axis.text = element_text(colour = "red", size = 12))

g + geom_histogram(aes(price, fill = cut), binwidth = 500) + labs(x = "Price", y = "Number of diamonds", title = "Distribution of prices \n across Cuts") + theme(plot.title = element_text(colour = "red", face = "italic"), ...

let messageBox:MessageBox = MessageBox() // set messageBox.setObject("TestObject1", forKey:"TestKey1") // get // but don't remove it, keep it stored, so that it can still be retrieved later let someObject:String = messageBox.getObject(forKey:"TestKey1", remov...

// init mUIPheonix = UIPheonix(with:myCollectionView) mUIPheonix = UIPheonix(with:myTableView) // connect model-view mUIPheonix.setModelViewRelationships([MyModel.nameOfClass:MyView.nameOfClass]) // add models for the UI models.append(SimpleButtonModel(id:1, title:"Hello World!")...

We show a plot similar to the showed at Linear regression on the mtcars dataset. First with defaults and the with some customization of the parameters. #help("mtcars") fit <- lm(mpg ~ wt, data = mtcars) bs <- round(coef(fit), 3) lmlab <- paste0("mpg = ", bs[1], ...

How to ... 1 - use twig extension class that extends use \Twig_Extension class dobToAge extends \Twig_Extension { 2 - Add the appropriate filter by overriding getFilters() method public function getFilters() { return array( 'age' => new \Twig_Filter_Method($this, '...

If you need to select between several options, enabling just one via enable_if<> can be quite cumbersome, since several conditions needs to be negated too. The ordering between overloads can instead be selected using inheritance, i.e. tag dispatch. Instead of testing for the thing that ne...

Installation: To install the LoopBack command-line interface (CLI) tool: npm install -g loopback-cli This installs the lb command-line tool for scaffolding and modifying LoopBack applications. Create new application: To create a new application: lb The LoopBack application generator will ...

This is the typical approach for novice developers building SQL action queries. They are vulnerable to the Bobby Tables type SQL Injection attacks. Dim strSQL As String strSQL = "INSERT INTO Employees chrFirstName, chrLastName, chrPhone " _ & "VALUES ('" & M...