Yes, but you need to declare it readonly instead of const: public static readonly string[] Titles = { “German”, “Spanish”, “Corrects”, “Wrongs” }; The reason is that const can only be applied to a field whose value is known at compile-time. The array initializer you’ve shown is not a constant expression in C#, so it … Read more
To access column 0: >>> test[:, 0] array([1, 3, 5]) To access row 0: >>> test[0, :] array([1, 2]) This is covered in Section 1.4 (Indexing) of the NumPy reference. This is quick, at least in my experience. It’s certainly much quicker than accessing each element in a loop.
For ruby >= 2.4 you can use sum: array.sum For ruby < 2.4 you can use inject: array.inject(0, :+) Note: the 0 base case is needed otherwise nil will be returned on empty arrays: > [].inject(:+) nil > [].inject(0, :+) 0
In PHP, all variables except objects are assigned by the mechanism called copy-on-write, while objects are assigned by reference. Which means that for the arrays with scalar values simply $b = $a already will give you a copy: $a = array(); $b = $a; $b[‘foo’] = 42; var_dump($a); Will yield: array(0) { } Whereas with … Read more
You can use Enumerable.SequenceEqual method. using System; using System.Linq; … var a1 = new int[] { 1, 2, 3}; var a2 = new int[] { 1, 2, 3}; var a3 = new int[] { 1, 2, 4}; var x = a1.SequenceEqual(a2); // true var y = a1.SequenceEqual(a3); // false If you can’t use .NET 3.5 … Read more
If your row length is a compile time constant, C++11 allows auto arr2d = new int [nrows][CONSTANT]; See this answer. Compilers like gcc that allow variable-length arrays as an extension to C++ can use new as shown here to get fully runtime-variable array dimension functionality like C99 allows, but portable ISO C++ is limited to … Read more
You’ll have to construct the query-string. <?php $ids = array(1, 2, 3, 7, 8, 9); $inQuery = implode(‘,’, array_fill(0, count($ids), ‘?’)); $db = new PDO(…); $stmt = $db->prepare( ‘SELECT * FROM table WHERE id IN(‘ . $inQuery . ‘)’ ); // bindvalue is 1-indexed, so $k+1 foreach ($ids as $k => $id) $stmt->bindValue(($k+1), $id); $stmt->execute(); … Read more
First, declare your Array as a typed array so that you can call methods when you iterate: var images : [imageFile] = [] Then you can simply do: Swift 2 images.sorted({ $0.fileID > $1.fileID }) Swift 3+ images.sorted(by: { $0.fileID > $1.fileID }) The example above gives the results in descending order.
Both array_push and the method you described will work. $cart = array(); $cart[] = 13; $cart[] = 14; // etc //Above is correct. but below one is for further understanding $cart = array(); for($i=0;$i<=5;$i++){ $cart[] = $i; } echo “<pre>”; print_r($cart); echo “</pre>”; Is the same as: <?php $cart = array(); array_push($cart, 13); array_push($cart, 14); … Read more
Use usort, here’s an example adapted from the manual: function cmp($a, $b) { return strcmp($a->name, $b->name); } usort($your_data, “cmp”); You can also use any callable as the second argument. Here are some examples: Using anonymous functions (from PHP 5.3) usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);}); From inside a class usort($your_data, array($this, “cmp”)); // “cmp” should … Read more