Tutorial by Examples: v

Listing files in a tar archive is done with untar function from the utils package (which is included in base R). untar(zipfile = "bar.tar", list = TRUE) This will list all files in "bar.tar" and extract none. Tilde expansion is done automatically from your working directory. ...

Extracting files from a tar archive is done with untar function from the utils package (which is included in base R). untar(tarfile = "bar.tar", exdir = "./foo") This will extract all files in "bar.tar" to the "foo" directory, which will be created if nece...

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)

Vlookup finds some value in the leftmost column of a range and returns a value some number of columns to the right and in the same row. Let's say you want to find the surname of Employee ID 2 from this table: =VLOOKUP(2,$A$2:$C$4,3,0) The value you're retrieving data for is 2 The table you...

Your code in source control has version numbers either by default (SVN ids or Git SHA1 hashes) or explicitly (Git tags). Rather than manually updating versions in AssemblyInfo.cs you can use a build time process to write the version from your source control system into your AssemblyInfo.cs files and...

function onOpen() { // Add a custom menu to run the script var ss = SpreadsheetApp.getActiveSpreadsheet(); var searchMenuEntries = [ {name: "Run", functionName: "search"}]; ss.addMenu("Get Files", searchMenuEntries); } function getFiles() { // Get...

Instead of struct IShape { virtual ~IShape() = default; virtual void print() const = 0; virtual double area() const = 0; virtual double perimeter() const = 0; // .. and so on }; Visitors can be used: // The concrete shapes struct Square; struct Circle; // The v...

The SilverStripe Grid Field Extensions Module has some very nice features to enhance the basic GridField... GridFieldAddExistingSearchButton - a more advanced search form for adding items GridFieldAddNewInlineButton - builds on GridFieldEditableColumns to allow inline creation of records. GridF...

First thing to do is enable the mod rewrite on wamp go to Apache modules and scroll down the list If not showing tick enable it and then restart all servers. Linux users can also use below terminal command to enable rewrite module sudo a2enmod rewrite Then restart apache using: sudo service...

Paste your fonts file inside android/app/src/main/assets/fonts/font_name.ttf Recompile the Android app by running react-native run-android Now, You can use fontFamily: 'font_name' in your React Native Styles

Check screencast video on YouTube about this feature IntelliJ provides a quick-preview feature called Viewing Definition. Using this feature allows a user to quickly see the contents of a method/class without navigating into the class itself OS X - (⌘+Y) or (⌥+Space) Unix / Windows - Ctrl+Shif...

When you also want to expose metadata without a config file you can build on the example programmatically creating a ServiceHost: public ConsoleHost() { mHost = new ServiceHost(typeof(Example), new Uri("http://localhost:8000/Example"), new Uri("net.tcp://9000/Example")); ...

Selective imports can help to cleanup the namespace and speed-up the compile-time even more, because the compiler only needs to parse the specific, selected functions. import std.stdio: writeln; void main() { writeln("Hello world"); }

Selective imports may also be renamed. void main() { import std.stdio : fooln = writeln; fooln("Hello world"); }

You can move a container instead of copying it: void print(const std::vector<int>& vec) { for (auto&& val : vec) { std::cout << val << ", "; } std::cout << std::endl; } int main() { // initialize vec1 with 1, 2, 3, 4 and...

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...

Suppose, that we have three users : The Administrator of the database > admin The application with a full access for her data > read_write The read only access > read_only --ACCESS DB REVOKE CONNECT ON DATABASE nova FROM PUBLIC; GRANT CONNECT ON DATABASE nova TO user; With th...

This function executes an AJAX request using the HEAD method allowing us to check whether a file exists in the directory given as an argument. It also enables us to launch a callback for each case (success, failure). function fileExists(dir, successCallback, errorCallback) { var xhttp = new XM...

You can also perform this task recursively, but I have chosen in this example to use an iterative approach. This task is useful if you are inserting all of your nodes at the beginning of a linked list. Here is an example: #include <stdio.h> #include <stdlib.h> #define NUM_ITEMS 10...

Given this setup code: var dict = new Dictionary<int, string>() { { 1, "First" }, { 2, "Second" }, { 3, "Third" } }; Use the Remove method to remove a key and its associated value. bool wasRemoved = dict.Remove(2); Executing this code remo...