Tutorial by Examples: re

Swift let datePicker = UIDatePicker(frame: CGRect(x: 0, y: 0, width: 320, height: 200) Objective-C UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(x: 0, y: 0, width: 320, height: 200)];

Recycling can be used in a clever way to simplify code. Subsetting If we want to keep every third element of a vector we can do the following: my_vec <- c(1,2,3,4,5,6,7,8,9,10) my_vec[c(TRUE, FALSE)] [1] 1 3 5 7 9 Here the logical expression was expanded to the length of the vector. ...

The simplest way to refer to a single cell on the current Excel worksheet is simply to enclose the A1 form of its reference in square brackets: [a3] = "Hello!" Note that square brackets are just convenient syntactic sugar for the Evaluate method of the Application object, so technicall...

To save a reference to a cell in a variable, you must use the Set syntax, for example: Dim R as Range Set R = ActiveSheet.Cells(3, 1) later... R.Font.Color = RGB(255, 0, 0) Why is the Set keyword required? Set tells Visual Basic that the value on the right hand side of the = is meant to be ...

os.path.abspath(os.path.join(PATH_TO_GET_THE_PARENT, os.pardir))

int i; int n = 1000000; double area = 0; double h = 1.0 / n; #pragma omp parallel shared(n, h) { double thread_area = 0; // Private / local variable #pragma omp for for (i = 1; i <= n; i++) { double x = h * (i - 0.5); thread_area += (4.0 / (1.0 ...

double area; double h = 1.0 / n; #pragma omp parallel for shared(n, h, area) for (i = 1; i <= n; i++) { double x = h * (i - 0.5); #pragma atomic area += (4.0 / (1.0 + x*x)); } pi = h * area; In this example, each threads execute a subset of the iteration count and they accumula...

double area; double h = 1.0 / n; #pragma omp parallel for shared(n, h, area) for (i = 1; i <= n; i++) { double x = h * (i - 0.5); #pragma omp critical { area += (4.0 / (1.0 + x*x)); } } double pi = h * area; In this example, each threads execute a subset of the iteratio...

int i; int n = 1000000; double area = 0; double h = 1.0 / n; #pragma omp parallel for shared(n, h) reduction(+:area) for (i = 1; i <= n; i++) { double x = h * (i - 0.5); area += (4.0 / (1.0 + x*x)); } pi = h * area; In this example, each threads execute a subset of the iteration...

You can re-throw error that you catch in CATCH block using TRHOW statement: DECLARE @msg nvarchar(50) = 'Here is a problem! Area: ''%s'' Line:''%i''' BEGIN TRY print 'First statement'; RAISERROR(@msg, 11, 1, 'TRY BLOCK', 2); print 'Second statement'; END TRY BEGIN CATCH print...

The PHP community has a lot of developers creating lots of code. This means that one library’s PHP code may use the same class name as another library. When both libraries are used in the same namespace, they collide and cause trouble. Namespaces solve this problem. As described in the PHP referenc...

realloc is conceptually equivalent to malloc + memcpy + free on the other pointer. If the size of the space requested is zero, the behavior of realloc is implementation-defined. This is similar for all memory allocation functions that receive a size parameter of value 0. Such functions may in fact ...

Expression trees represent code in a tree-like data structure, where each node is an expression Expression Trees enables dynamic modification of executable code, the execution of LINQ queries in various databases, and the creation of dynamic queries. You can compile and run code represented by expr...

Several 'insert' functions can "burn" ids. Here is an example, using InnoDB (other Engines may work differently): CREATE TABLE Burn ( id SMALLINT UNSIGNED AUTO_INCREMENT NOT NULL, name VARCHAR(99) NOT NULL, PRIMARY KEY(id), UNIQUE(name) ) ENGINE=InnoDB; IN...

to check if the given path is a directory dirname = '/home/john/python' os.path.isdir(dirname) to check if the given path is a file filename = dirname + 'main.py' os.path.isfile(filename) to check if the given path is symbolic link symlink = dirname + 'some_sym_link' os.path.islink(symli...

One of the primary uses for this cv-qualifiers is const correctness. This is the practice of guaranteeing that only accesses that need to modify an object are able to modify the object, and that any (member or non-member) function that doesn't need to modify an object doesn't have write access to t...

configuration EnableIISFeature { node localhost { WindowsFeature IIS { Ensure = “Present” Name = “Web-Server” } } } If you run this configuration in Powershell (EnableIISFeature), it will produce a localho...

Starting a DSC on a remote machine is almost just as simple. Assuming you've already set up Powershell remoting (or enabled WSMAN). $remoteComputer = "myserver.somedomain.com" $cred = (Get-Credential) Start-DSCConfiguration -ServerName $remoteComputer -Credential $cred -Verbose Nb: A...

To list available DSC resources on your authoring node: Get-DscResource This will list all resources for all installed modules (that are in your PSModulePath) on your authoring node. To list all available DSC resources that can be found in the online sources (PSGallery ++) on WMF 5 : Find-DS...

Before you can use a resource in a configuration, you must explicitly import it. Just having it installed on your computer, will not let you use the resource implicitly. Import a resource by using Import-DscResource . Example showing how to import the PSDesiredStateConfiguration resource and the F...