arrays

How to convert single dimensional arrays to multi dimensional ones? (C#)

I have to use a method which accepts double[,], but I only have a double[]. How can I convert it? Solution so far: var array = new double[1, x.Length]; foreach (var i in Enumerable.Range(0, x.Length)) { array[0, i] = x; } ...

Is it possible to extend arrays in C#?

I'm used to add methods to external classes like IEnumerable. But can we extend Arrays in C#? I am planning to add a method to arrays that converts it to a IEnumerable even if it is multidimensional. Not related to http://stackoverflow.com/questions/628427/how-to-extend-arrays-in-c ...

How to build recursive function to list all combinations of a multi-level array?

I have an array that can contain any number of elements. Each element contains an ID and an array called "options" (also with any number of elements). Here is the structure: $arr = array( array('id' => 10, 'options' => array(3, 5)), array('id' => 15, 'options' => array(2, 4, 8, 9)), array('id' => 2...

Filling Array with Custom Class - retrieving values...

I have the following code NSMutableArray *leeTemp = [[NSMutableArray alloc] init]; Player* playerLee = [[Player alloc] init]; playerLee.name = [array objectAtIndex:1]; [leeTemp addObject:playerLee]; [playerLee release]; And this generates an array of Players (I think)! When I do the following it shows the addresses of the Players. N...

working with string arrays in c++

I wanna create a list of 50 elements which consist of four chars each. Every four char string should go into a loop one by one and get checked for one of three letters (o, a, e) anywhere in the current string. dependent on whether or not these letters are identified different commands are executed I tried all day im frustrated please he...

PHP: Sorting array with natsort

I have a PHP script that creates a thumbnail and lists an image gallery. The problem I'm having is that it lists it by timestamp on the server but I want it to list 'naturally'. <?php # SETTINGS $max_width = 100; $max_height = 100; $per_page = 24; $page = $_GET['page']; $has_previous = false; $has_next = false; function getPictures()...

php function to split an array at each blank line?

Hello, I'm building a script which will open a saved text file, export the contents to an array and then dump the contents in a database. So far I've been able to get the file upload working quite happily and can also open said file. The trouble I'm having is the contents of the file are variable, they have a fixed structure but the co...

php copying array elements by value, not by reference

I have the following code: $data['x'] = $this->x->getResults(); $data['y'] = $data['x']; //some code here to modify $data['y'] //this causes (undesirably) $data['x] to be modified as well I guess since all the elements of $data are themselves references, modifying $data['y'] also modifies $data['x']..which is NOT what I want. I w...

Finding if the major and minor diagonals of 2D array are comprised of 0's

This is a school problem I am working on for an intro Java class. The assignment is to write a program that generates an 8 x 8 matrix of randomly generated binary numbers and have the program check which, if any, columns are all 0's and if the major and minor diagonals are also comprised of zeroes. A major diagonal is the diagonal formed...

Subtracting one Array from another in Ruby

I've got two arrays of Tasks - created and assigned. I want to remove all assigned tasks from the array of created tasks. Here's my working, but messy, code: @assigned_tasks = @user.assigned_tasks @created_tasks = @user.created_tasks #Do not show created tasks assigned to self @created_not_doing_tasks = Array.new @created_tasks.e...

Sorting an array of arrays in Ruby

I have an array of arrays like so: irb(main):028:0> device_array => [["name1", "type1", ["A", "N", "N"], ["Attribute", "device_attribute"], 9], ["name2","type2", ["A", "N", "N"], ["Attribute", "device_attribute"], 7]] I would like to sort the entire device_array on the 4th element. I've tried AllDevicesController.all_devices.sort d...

Can this code to loop through photos in a folder be optimised?

I have written this code having not used PHP for 2 years now to loop through a folder of photos and write them to the page in alphabetical order. It is a fairly simple request but it took me the best part of 15 minutes to write. if ($handle = opendir('photos')) { $count = 0; $list[] = array(); while (false !== ($file = readdir($ha...

PHP arrays and solution to 'undefined index' errors.

I am working through some code done by a previous developer. I'm pretty new to PHP so I am wondering if there is any well known pattern or solution to this problem. Basically the original author does not check any array indexes before he tries to use them. I know I can use isset() to check each before it is used, but right now there ar...

Multidimensional array manipulation - Java

I have a series of arrays that i draw data from and ultimately lead to a final array that holds the information i want. The final array is 2-dimensional, being comprised of a large number of single dimensional arrays, each holding up to 3 entries. int[][] realOcc = new int[result.length][3]; The way the array holds data is as follows:...

Find which two values of an array a given value is between

Suppose I have an array similar to this (actual values probably will not be so predictable): $ar[0] = 5; $ar[1] = 10; $ar[2] = 15; $ar[3] = 20; and I have $n = 8, what would be a good way to find that $n falls between $ar[0] and $ar[1]? Preferably, the solution would avoid looping through the entire array, as this will probably repeat...

Built-in PHP function to reset the indexes of an array?

Example: $arr = array(1 => 'Foo', 5 => 'Bar', 6 => 'Foobar'); /*... do some function so $arr now equals: array(0 => 'Foo', 1 => 'Bar', 2 => 'Foobar'); */ ...

Caching large Arrays to SQLite - Java/ Android

Im currently developing a system where the user will end up having large arrays( using android). However the JVM memory is at risk of running out, so in order to prevent this I was thinking of creating a temporary database and store the data in there. However, one of the concerns that comes to me is the SDcard limited by read and write....

Serializing a checkbox array

Hi all, long time reader/first time poster here. So I've got a checkbox array that posted just fine to my table when I had an ajax post via: var createListingString="&features=" + arrayCheckBox; Now I'm jquerying EVERYTHING (and loving it), but each time I try to post my array with data: $("#create_listing_1").serialize(), I just ge...

CakePHP array structure from a HABTM query.

I have two tables linked via a HABTM. countries & networks. They are linked together by the countries_networks lookup table. I need to get all of the countries and all of the associated network ids for each corresponding country. I don't need to go as far as getting the network names, simply getting the ids from the lookup table will su...

Get array element after performing a function on it??

Hey all, I'm looking to see if there is some PHP syntax that I'm missing that will allow me to grab the contents of the array I just manipulated using a function.. Good example: $firstElement = sort($myArray)[0]; Where normally I would have to do this: $myArray = sort($myArray); $firstElement = $myArray[0]; Any clean way of doing...