jagged-arrays

I'm trying to marshal a 2D C# jagged array ( double[][] jaggedArray ) to a C++ dll where i've specified the receiving variable to be a double** . However, i'm getting the message: There is no marshaling support for nested arrays. Short of flattening the jagged array is there a way to use jagged arrays from C# in a C++ dll? Using low level Marshal class methods, it is possible to marshal any type to unmanaged memory. For example, for every double[] array in jaggedArray, allocate unmanaged memory block with Marshal.AllocHGlobal, and copy array members to it using Marshal.Copy Method (Double[],

I have a C# WCF webservice which is called by two VB 6 project. The target VB project is sending to the client VB project a multidimensional array. I want to convert the multidimensional array to a jagged array but i have no luck. How can i find the number of olements in my object[,] to be able to initialize the jagged array ? I want to follow the answer from this question but i don't have a GetLength method on my object. I tried : int firstElement = astrManTfrLetters.GetLength(0); int secondElement = astrManTfrLetters.GetLength(1); And i stuck here. Usually the solutions presented assume 0

I would like some help to create the following convertions: A need to convert an 800*600 multidimensional array into a jagged array and then the same method in reverse (jagged array with the same data to the original multidimensional array) Is this possible? and any help about it? user2989975 I realize the question is a bit old but for flexability sake, I modfied the method a bit to calculate the array sizes within the method as opposed to having to pass them in: static object[][] convertToJaggedArray(object[,] multiArray) { int firstElement = multiArray.GetLength(0); int secondElement =

Consider the following array: int[,] numbers = new int[3, 2] { { 2, 1 }, { 3, 4 }, { 6, 5 } }; I would like to use LINQ to construct an IEnumerable with numbers 2, 1, 3, 4, 6, 5. What would be the best way to do so? Bob Vale How about: Enumerable .Range(0,numbers.GetUpperBound(0)+1) .SelectMany(x => Enumerable.Range(0,numbers.GetUpperBound(1)+1) .Select (y =>numbers[x,y] )); or to neaten up. var xLimit=Enumerable.Range(0,numbers.GetUpperBound(0)+1); var yLimit=Enumerable.Range(0,numbers.GetUpperBound(1)+1); var result = xLimit.SelectMany(x=> yLimit.Select(y => numbers[x,y])); EDIT Revised

Is it possible to have a jagged array in JavaScript? Here is the format of the data I want to store in a jagged array: (key)(value1, value2, value3) Can I put this in a jagged array? Yes, you can create that type of array using object or array literal grammar, or object/array methods. An array of arrays: // Using array literal grammar var arr = [[value1, value2, value3], [value1, value2]] // Creating and pushing to an array var arr = []; arr.push([value1, value2, value3]); An object of arrays: // Using object literal grammar var obj = { "key": [value1, value2, value3], "key2": [value1, value2]

Simple question here: is there any way to convert from a jagged array to a double pointer? e.g. Convert a double[][] to double** This can't be done just by casting unfortunately (as it can in plain old C), unfortunately. Using a fixed statement doesn't seem to resolve the problem either. Is there any (preferably as efficient as possible) way to accomplish this in C#? I suspect the solution may not be very obvious at all, though I'm hoping for a straightforward one nonetheless. A double[][] is an array of double[], not of double* , so to get a double** , we first need a double*[] double[][]

I'm trying to convert this function from Jagged Array to 2D array, and I'm not able to convert everything Original Function: public static double[][] InvertMatrix(double[][] A) { int n = A.Length; //e will represent each column in the identity matrix double[] e; //x will hold the inverse matrix to be returned double[][] x = new double[n][]; for (int i = 0; i < n; i++) { x[i] = new double[A[i].Length]; } /* * solve will contain the vector solution for the LUP decomposition as we solve * for each vector of x. We will combine the solutions into the double[][] array x. * */ double[] solve; //Get

How can you create a 2D array,say, arr[][] with 5 rows and each row has a variable number of columns in it? possibly arr[5][] with 1st row arr[0][] with 4 columns 2nd row arr[1][] with 5 columns and so on? I wouldn't mind a STL vector solution but I don't know vectors very well yet. With C++11, you can do it easily with vectors (line breakes added for readability): std::vector< std::vector <int > > arr = { {1,2,3}, {4,5}, {6,7,8,9,0} }; If you don't have a C++11 compiler, it works the exact same way, but you will not be able to initialize them as easy. You can set elements individually: std:

In C# there are 2 ways to create mutlidimensional arrays. int[,] array1 = new int[32,32]; int[][] array2 = new int[32][]; for(int i=0;i<32;i++) array2[i] = new int[32]; I know that the first method creates a 1-dimensional array internally, and that the second method creates an array of arrays (slower access). However in Java, there is no such thing as [,], and I see multidimensional arrays declared like this: int[][] array3 = new int[32][32]; Since such syntax is illegal in C#, and Java has no int[,] , I'm wondering if this is equivilant to array1 ? Or is it still an array of arrays? You are