Hi, I would like to find out safe ways of implementing three dimensional arrays of integers in C++, using pointer arithmetic / dynamic memory allocation, or, alternatively using STL techniques such as vectors. Essentially I want my integer array dimensions to look like: [ x ][ y ][ z ] x and y are in the range 20-6000 z is known and ...
I am trying to solve numerically a set of partial differential equations in three dimensions. In each of the equations the next value of the unknown in a point depends on the current value of each unknown in the closest points. To write an efficient code I need to keep the points close in the three dimensions close in the (one-dimension...
I have CSV data loaded into a multidimensional array. In this way each "row" is a record and each "column" contains the same type of data. I am using the function below to load my CSV file. function f_parse_csv($file, $longest, $delimiter) { $mdarray = array(); $file = fopen($file, "r"); while ($line = fgetcsv($file, $longe...
If you have a hash (or reference to a hash) in perl with many dimensions and you want to iterate across all values, what's the best way to do it. In other words, if we have $f->{$x}{$y}, I want something like foreach ($x, $y) (deep_keys %{$f}) { } instead of foreach $x (keys %f) { foreach $y (keys %{$f->{$x}) { } ...
Say for example you just queried a database and you recieved this 2D array. $results = array( array('id' => 1, 'name' => 'red' , 'spin' => 1), array('id' => 2, 'name' => 'green', 'spin' => -1), array('id' => 3, 'name' => 'blue' , 'spin' => .5) ); I often find myself writing loops like this. foreach($results as $result) ...
I have a 2 dimensional array, like so: char[,] str = new char[2,50]; Now, after I've stored contents in both str[0] and str[1], how do I store it in a string[] s = new string[2]; ? I tried s[0] = str[0].ToString(); but that seems to be an error: VC# expects 'two' indices within the braces, which means I can convert only a cha...
In C++ I'd like to do something like: int n = get_int_from_user(); char* matrix = new char[n][n]; matrix[0][0] = 'c'; //... matrix[n][n] = 'a'; delete [][] matrix; but of course this doesn't work. What is the best way to do something similar? I've seen some solutions to this but they seem pretty messy. ...
Hello, I am a bit new to Perl, but here is what I want to do: my @array2d; while(<FILE>){ push(@array2d[$i], $_); } It doesn't compile since @array2d[$i] is not an array but a scalar value. How sould I declare @array2d as an array of array? Of course, I have no idea of how many rows I have. ...
I'm in a basic programming class, and everything is done in pseudo code. My question is this: How do you link two arrays? I have a single-dimensional array that lists students names, and I have a two-dimensional array that lists the top eight scores of each student...this is all fine and dandy, but now I need to sort the arrays by th...
What is the accepted/most commonly used way to manipulate dynamic (with all dimensions not known until runtime) multi-dimensional arrays in C and/or C++. I'm trying to find the cleanest way to accomplish what this Java code does: public static void main(String[] args){ Scanner sc=new Scanner(System.in); int rows=sc.nextInt(); int co...
Hi all, I have the following code: <tr> <td width="60%"><dl> <dt>Full Name</dt> <dd> <input name="fullname[]" type="text" class="txt w90" id="fullname[]" value="<?php echo $value; ?>" /> </dd> </dl></td> <td width="30%"><dl> <dt>Job Title</dt> <dd>...
I'm tasked with creating a datawarehouse for a client. The tables involved don't really follow the traditional examples out there (product/orders), so I need some help getting started. The client is essentially a processing center for cases (similar to a legal case). Each day, new cases are entered into the DB under the "cases" table....
I'm setting up Fact and Dim tables and trying to figure out the best way to setup my time values. AdventureworksDW uses a timekey (UID) for each time entry in the DimTime table. I'm wondering there's any reason I shouldn't just use a time value instead i.e. 0106090800 (My granularity is hourly)? ...
I am now designing an SNMP library. The problem is caused by a special function like this, *** GetTable(string id) This function may return Variable[,] which is a two dimensional array sometimes, but also Variable[,,] and arrays with more dimensions. So I believe it is not reasonable to return fixed array such as Variable[,], Variable[...
Dear All I have a PHP file going to write a two-dimensional array in javascript: <?php print "<script language='javascript'>"; print " extra[0][0]=new Array(1,'Bob',12);"; print " extra[0][1]=new Array(2,'Alice',18);"; .. // need to assign the extra[1][0],extra[1][1] so on. print "</script>"; ...
In main: char *myData[500][9]; //dynamic rows?? char **tableData[500]={NULL}; //dynamic rows?? int r; newCallBack(db, &myData, &tableData, &r); and passing into function by: void newCallBack(sqlite3 *db, char** mdat, char*** tdat, int* r ) { Doesn't seem to like this? Any suggestions? Lots of examples online when you don...
how do I make a pointer to a multidimensional array, which have a unknown size? I've tried this: int **triangles; triangles = new int[numTriangles][3]; But i get this error: cannot convert 'int (*)[3]' to 'int**' in assignment ...
This question builds off of a previously asked question: Pass by reference multidimensional array with known size I have been trying to figure out how to get my functions to play nicely with 2d array references. A simplified version of my code is: unsigned int ** initialize_BMP_array(int height, int width) { unsigned in...
I'd like to test a function that takes runtime-allocated multidimensional arrays, by passing it a hardcoded array. The function has a signature of void generate_all_paths(int** maze, int size) and the array is defined as int arr[5][5] = {REMOVED}. I'm not exactly sure how to properly coerce the array for the function (or if that is imp...
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") #...