I have two or more arrays -- one with IDs, one or more with string values. I want to merge these into a hash table so I can look up values by ID. The following function does the job, but a shorter and sweeter version (LINQ?) would be nice: Dictionary<int, string[]> MergeArrays( IEnumerable<int> idCollection, ...
Given the type: class Field{ public string Name{get;set;} public string[] DependsOn{get;set;} } Let's say I have an array of Field items: List<Field> fields = new List<Field>(); fields.Add(new Field() { Name = "FirstName" }); fields.Add(new Field() { Name = "FullName", DependsOn = new[] {"FirstName",...
Most of my programming experience is in a language where there is one collection data structure -- an array. Now that I'm working primarily in .NET, I've come to appreciate the vast number of tools available to me, but I also find it difficult to determine which tools is best suited for each problem. I find this to be the case often wi...
How can I add a new key/value pair to an existing array inside of nested foreach loops and have that pair persist outside the scope of the loops? <?PHP include('magpierss/rss_fetch.inc'); /* one, two, skip a few... $urls is an associative array with database indices as keys and URLs as values ...
I've got a file INPUT that has the following contents: 123\n 456\n 789 I want to run my script like so: script.rb < INPUT and have it convert the contents of the INPUT file to an array, splitting on the new line character. So, I'd having something like myArray = [123,456,789]. Here's what I've tried to do and am not having much luck: ...
I'm attempting to make a data structure to represent a Maze in C++. All the data I need to hold about the maze can be stored in 16 bit integers using bitwise operations (to represent each cell of the maze): 16 bit unsigned integer So, I figured a 2d array of 16bit integers and I'm good to go for my Maze data structure. I wanted to ke...
Hi, I'm trying to create an array of arrays that will be using repeated data, something like below: int[] list1 = new int[4] { 1, 2, 3, 4}; int[] list2 = new int[4] { 5, 6, 7, 8}; int[] list3 = new int[4] { 1, 3, 2, 1 }; int[] list4 = new int[4] { 5, 4, 3, 2 }; int[,] lists = new int[4, 4] { list1 , list2 , list3 , list4 }; I ca...
I've got a multidimensional array: foo = [["a","b","c"], ["d", "e", "f"], ["g", "h", "i"]] Now I need to ruturn the "coordinates" of "f", which should be (1,2). How can I do this without knowing which "row" "f" is in? I've been trying to use the index method, but this only works when I tell it where to look, i.e. foo[1].index("f") #...
I have tried this example of array of pointers. I am getting the error "Illegal initialisation in function main" int main() { int a[]={1,2,3,4,5}; int b[]={1,2,3,4,5}; int c[]={1,2,3,4,5}; int *p[3]={a,b,c}; int i; clrscr(); for(i=0;i<3;i++) printf("%d - %u\n",*p[i],p[i]); getch(); } If I use stati...
(can you tell I'm learning Ruby today? :)) I want to determine if the multidimensional array I'm working with is a 'rectangle'--i.e., the rows are the same size. Here's what I'm doing, which works but feels clunky. if @myArray[0].size != @myArray[[email protected]].size raise "This array is not a rectangle." end Basically, I'm check...
Judy array is fast data structure that may represent a sparse array or a set of values. Is there its implementation for managed languages such as C#? Thanks ...
Ok so I have the following code. I'm trying to output some xml so that it can be read with jQuery, but for whatever reason, when I try to add an element in the array to a variable, it just turns the variable to 0. I did a print_r() on the array, and it's normal. Code if ($content == "tables") { $result = mysql_query("show tables");...
In the question "Is returning a whole array from a Perl subroutine inefficient" two people recommend against optimizing if there is no need for it. As a general rule, optimizing can add complexity, and if it's not needed, simple is better. But in this specific case, returning an array versus an array ref, I don't see that there's any a...
Hi In PHP, will these always return the same values? //example 1 $array = array(); if ($array) { echo 'the array has items'; } // example 2 $array = array(); if (count($array)) { echo 'the array has items'; } Thank you! ...
I need to have a static void* array[1024]; in a library and i need to have it set to NULL for every entries. My question is about the best way to set the entire array to NULL, is a memset (array, NULL, sizeof (void*) * 1024) the best solution? ...
If I have a loop that requests my data from my form: for ($i=0;$i < count($_POST['checkbx']);$i++) { // calculate the file from the checkbx $filename = $_POST['checkbx'][$i]; $clearfilename = substr($filename, strrpos ($filename, "/") + 1); echo "'".$filename."',"; } how do I add that into the sample ...
I know that it's more performant to use '' delimited strings rather than ""... but I was wondering if there's any performance improvemente doing this $a = array( 'table' => 'myTable', 'order' => 'myOrder' ); $table = $a['table'] instead of $a = array( table => 'myTable', order => 'myOrder' ); $table = $a[table] I guess so, bu...
how do you initialize and uninitialize a multidimensional character array in C++? ...
Lets assume I have an array in PHP: $array = array("apple", "banana", "cap", "dog", etc..) up to 80 values. and a string variable: $str = "abc"; If I want to check whether this string ($str) is exists in the array or not, I use preg_match function. Which is like this: $isExists = preg_match("/$str/", $array); if ($isExists){ ...
On a quad-core machine, I am considering the parallelization of C#/.NET algorithm which involves having multiple threads reading the small int[] array concurrently. So far, it seems to be working rather well, but I am not sure where it is specified that concurrent reads on an array are thread-safe in .NET. Any pointers? Then, I am also ...