I tried: somearray = [“some”, “thing”] anotherarray = [“another”, “thing”] somearray.push(anotherarray.flatten!) I expected [“some”, “thing”, “another”, “thing”] but got [“some”, “thing”, nil] 18 s 18 You’ve got a workable idea, but the #flatten! is in the wrong place — it flattens its receiver, so you could use it to turn [1, 2, [‘foo’, ‘bar’]] into … Read more
Given this array: $inventory = array( array(“type”=>”fruit”, “price”=>3.50), array(“type”=>”milk”, “price”=>2.90), array(“type”=>”pork”, “price”=>5.43), ); I would like to sort $inventory‘s elements by price to get: $inventory = array( array(“type”=>”pork”, “price”=>5.43), array(“type”=>”fruit”, “price”=>3.50), array(“type”=>”milk”, “price”=>2.90), ); How can I do this? 22 s 22 PHP 7+ As of PHP 7, this can be done concisely using usort … Read more
In Python, I have an ndarray y that is printed as array([0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1]) I’m trying to count how many 0s and how many 1s are there in this array. But when I type y.count(0) or y.count(1), it says numpy.ndarray object has no attribute count What … Read more
How do i declare a 2d array using new? Like, for a “normal” array I would: int* ary = new int[Size] but int** ary = new int[sizeY][sizeX] a) doesn’t work/compile and b) doesn’t accomplish what: int ary[sizeY][sizeX] does. 27 s 27 If your row length is a compile time constant, C++11 allows auto arr2d = … Read more
I want to define a two-dimensional array without an initialized length like this: Matrix = [][] But this gives an error: IndexError: list index out of range 29 s 29 You’re technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this “list … Read more
I have been reading online and some places say it isn’t possible, some say it is and then give an example and others refute the example, etc. How do I declare a 2 dimensional array in JavaScript? (assuming it’s possible) How would I access its members? (myArray[0][1] or myArray[0,1]?) 5 54
How can I sort this array by the value of the “order” key? Even though the values are currently sequential, they will not always be. Array ( [0] => Array ( [hashtag] => a7e87329b5eab8578f4f1098a152d6f4 How to Sort a Multi-dimensional Array by Value => Flower [order] => 3 ) [1] => Array ( [hashtag] => b24ce0cd392a5b0b8dedc66c25213594 … Read more
I have a JavaScript array like: [[“$6”], [“$12”], [“$25”], [“$25”], [“$18”], [“$22”], [“$10”]] How would I go about merging the separate inner arrays into one like: [“$6”, “$12”, “$25”, …] 8 84
Yes, you should iterate over 2D boolean array in order to deep copy it. Also look at java.util.Arrays#copyOf methods if you are on Java 6. I would suggest the next code for Java 6: public static boolean[][] deepCopy(boolean[][] original) { if (original == null) { return null; } final boolean[][] result = new boolean[original.length][]; for (int i … Read more
I want to create a 2D array that each cell is an ArrayList! If you want to create a 2D array of ArrayList.Then you can do this : ArrayList[][] table = new ArrayList[10][10]; table[0][0] = new ArrayList(); // add another ArrayList object to [0,0] table[0][0].add(); // add object to that ArrayList
