jagged-arrays

A workaround for a big multidimensional array (Jagged Array) C#?

风格不统一 提交于 2019-12-07 00:37:34
问题 I'm trying to initialize an array in three dimension to load a voxel world. The total size of the map should be ( 2048/1024/2048 ). I tried to initialize an jagged array of "int" but I throw a memory exception. What is the size limit? Size of my table: 2048 * 1024 * 2048 = 4'191'893'824 Anyone know there a way around this problem? // System.OutOfMemoryException here ! int[][][] matrice = CreateJaggedArray<int[][][]>(2048,1024,2048); // if i try normal Initialization I also throws the

Numpy: average over one dimension in “jagged” 3D array

雨燕双飞 提交于 2019-12-06 14:22:16
Suppose I have an N*M*X-dimensional array "data", where N and M are fixed, but X is variable for each entry data[n][m]. (Edit: To clarify, I just used np.array() on the 3D python list which I used for reading in the data, so the numpy array is of dimensions N*M and its entries are variable-length lists) I'd now like to compute the average over the X-dimension, so that I'm left with an N*M-dimensional array. Using np.average/mean with the axis-argument doesn't work, so the way I'm doing it right now is just iterating over N and M and appending the manually computed average to a new list, but

Generic printing of jagged arrays

倾然丶 夕夏残阳落幕 提交于 2019-12-05 19:56:51
I am currently working with lots of arrays and for debugging purposes I wrote a generic Print() method to print different kinds of arrays static void Main() { Print(new double[]{ 1, 2, 3 }); // Output: [ 1, 2, 3 ] } static void Print<T>(T[] array) { int size = array.Length; if (size == 0) return; string str = "[ "; for (int i = 0; i < size; i++) { str += array[i].ToString(); if (i < size - 1) str += ", "; } str += " ]"; Console.WriteLine(str); } which works fine so far. Then I wanted to print an array of arrays, like double[][] , and tried the following: static void Main() { Print(new double[]

A workaround for a big multidimensional array (Jagged Array) C#?

寵の児 提交于 2019-12-05 04:48:05
I'm trying to initialize an array in three dimension to load a voxel world. The total size of the map should be ( 2048/1024/2048 ). I tried to initialize an jagged array of "int" but I throw a memory exception. What is the size limit? Size of my table: 2048 * 1024 * 2048 = 4'191'893'824 Anyone know there a way around this problem? // System.OutOfMemoryException here ! int[][][] matrice = CreateJaggedArray<int[][][]>(2048,1024,2048); // if i try normal Initialization I also throws the exception int[, ,] matrice = new int[2048,1024,2048]; static T CreateJaggedArray<T>(params int[] lengths) {

Jagged Arrays in Data | Text To Columns

蹲街弑〆低调 提交于 2019-12-05 03:40:19
What I have Let's take an example of this code which works. Sub Sample() Dim ws As Worksheet Set ws = ThisWorkbook.Sheets("Sheet1") ws.Columns(1).TextToColumns _ Destination:=Range("A1"), _ DataType:=xlFixedWidth, _ FieldInfo:=Array( _ Array(0, 1), Array(60, 1), Array(120, 1), Array(180, 1), _ Array(240, 1), Array(300, 1), Array(360, 1), Array(420, 1) _ ), _ TrailingMinusNumbers:=True End Sub What I want In a small set of data, the above code works. But what if I want to go up to say Array(2700,1) ? This means I will have to write it 46 times Array(0, 1), Array(60, 1)...Array(1080, 1)....Array

Fixed statement with jagged array

女生的网名这么多〃 提交于 2019-12-04 04:41:09
问题 I have jagged array which I need to pass to external method. [DllImport(...)] private static extern int NativeMethod(IntPtr[] ptrArray); ... fixed (ulong* ptr = array[0]) { for (int i = 0; i < array.Length; i++) { fixed (ulong* p = &array[i][0]) { ptrArray[i] = new IntPtr(p); } } NativeMethod(ptrArray); } The problem is that ptr is unused and is removed due compilation. Than fixed statement according to it is removed too. So array be moved by GC in that way that ptrArray elements become

Unexpected behavour when making array of 2D arrays, of similar dimension

一笑奈何 提交于 2019-12-04 04:14:24
问题 MWE: def showArrayOfList(a,b,c): wlist = [np.zeros((szNext,szThis)) for (szThis,szNext) in [(a,b),(b,b),(b,b),(b,c)]] print "wlist:", map(np.shape,wlist) wArray = np.asarray(wlist) print "wArray:", map(np.shape,wArray) print "shape wArray:", shape(wArray) np.zeros can be substituted for any other matrix function that returns a matrix given a shape The output from the following is what I expect (and get): In[1]: ShowArrayOfList(1,4,5) Out[1]: wlist: [(4, 1), (4, 4), (4, 4), (5, 4)] wArray: [(4

Array of Arrays

淺唱寂寞╮ 提交于 2019-12-03 16:08:39
How do you create an array of arrays in C#? I have read about creating jagged arrays but I'm not sure if thats the best way of going about it. I was wanting to achieve something like this: string[] myArray = {string[] myArray2, string[] myArray3} Then I can access it like myArray.myArray2[0]; I know that code won't work but just as an example to explain what I mean. Thanks. Simple example of array of arrays or multidimensional array is as follows: int[] a1 = { 1, 2, 3 }; int[] a2 = { 4, 5, 6 }; int[] a3 = { 7, 8, 9, 10, 11 }; int[] a4 = { 50, 58, 90, 91 }; int[][] arr = {a1, a2, a3, a4}; To

Multi-Dimensional Arrays in C: are they jagged?

醉酒当歌 提交于 2019-12-03 10:51:34
A simple question about the C programming language (ANSI-C): Are the multi-dimensional arrays in C jagged? I mean - are we talking about "array of arrays" (one array of pointers to other addresses in the memory) , or this is just "long one-dimensional array" (which is stored sequentially in the memory)? What that bothers me is that I'm kinda sure that: matrix[i][j] is equivalent to * ( * (matrix + i) + j) A multidimensional array in C is contiguous. The following: int m[4][5]; consists of 4 int[5] s laid out next to each other in memory. An array of pointers: int *m[4]; is jagged. Each pointer

How can I concatenate vectors to create non-rectangular matrices in MATLAB?

此生再无相见时 提交于 2019-12-02 21:44:30
问题 Is there a way to create non-rectangular matrices? For example, if I have a matrix a=[6 8 10] and another matrix b=[1 5] , can I vertically concatenate them in order to obtain [6 8 10] in one row and [1 5] in another? 回答1: The direct answer is no . MATLAB does not support ragged or non-rectangular or non-square matrices. One way you could get around this is to make a cell array, where each cell is a vector of unequal lengths. Something like: a = [6 8 10]; b = [1 5]; c = cell(1,2); c{1} = a; c