jagged-arrays

Converting jagged array to 2D array C#

由 [亡魂溺海] 提交于 2019-11-26 17:07:47
问题 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

How to convert list of arrays into a multidimensional array

由 筅森魡賤 提交于 2019-11-26 16:44:56
I need to convert the following collection into double[,]: var ret = new List<double[]>(); All the arrays in the list have the same length. The simplest approach, ret.ToArray() , produces double[][], which is not what I want. Of course, I can create a new array manually, and copy numbers over in a loop, but is there a more elegant way? Edit: my library is invoked from a different language, Mathematica, which has not been developed in .Net. I don't think that language can utilize jagged arrays. I do have to return a multidimensional array. I don't believe there's anything built into the

How to get a dimension (slice) from a multidimensional array

由 纵然是瞬间 提交于 2019-11-26 16:33:53
问题 I'm trying to figure out how to get a single dimension from a multidimensional array (for the sake of argument, let's say it's 2D), I have a multidimensional array: double[,] d = new double[,] { { 1, 2, 3, 4, 5 }, { 5, 4, 3, 2, 1 } }; If it was a jagged array, I would simply call d[0] and that would give me an array of {1, 2, 3, 4, 5} , is there a way I can achieve the same with a 2D array? 回答1: No. You could of course write a wrapper class that represents a slice, and has an indexer

How do I set up a “jagged array” in VBA?

由 安稳与你 提交于 2019-11-26 16:20:22
I have a classroom full of kids, each of whom have to list their favorite toys for an assignment. Some kids only list 1 toy whereas others list more. How do I create a jagged array such that Kids(x)(y)...where x is the number of kids in my class, and y is the list of toys that they list as their favorites? "Jagged array" is slang for array of arrays. VBA's Variant data type can contain just about anything*, including an array. So you make an array of type Variant , and assign to each of its elements an array of arbitrary length (i.e. not all of them have to have equal length). Here's an

Java Jagged Array

由 拜拜、爱过 提交于 2019-11-26 08:33:10
问题 Our homework assignment asks us to use a jagged array to store the values of a two dimensional boolean matrix. Is there a built in java class for the jagged array or am I going to have to manually create it with an Array of ArrayLists? 回答1: In Java, a 2D array is an array of 1D array objects. Each 1D array can have different length, which means that you get jagged arrays out of the box. For example, the following is perfectly valid Java, and prints out 3 5 3 4 : int x[][] = {{0,1,2,3,4},{0,1

What is a jagged array?

由 情到浓时终转凉″ 提交于 2019-11-26 06:42:58
问题 What is a jagged array (in c#)? Any examples and when should one use it.... 回答1: A jagged array is an array of arrays. string[][] arrays = new string[5][]; That's a collection of five different string arrays, each could be a different length (they could also be the same length, but the point is there is no guarantee that they are). arrays[0] = new string[5]; arrays[1] = new string[100]; ... This is different from a 2D array where it is rectangular, meaning each row has the same number of

How do I set up a “jagged array” in VBA?

由 社会主义新天地 提交于 2019-11-26 05:56:21
问题 I have a classroom full of kids, each of whom have to list their favorite toys for an assignment. Some kids only list 1 toy whereas others list more. How do I create a jagged array such that Kids(x)(y)...where x is the number of kids in my class, and y is the list of toys that they list as their favorites? 回答1: "Jagged array" is slang for array of arrays. VBA's Variant data type can contain just about anything*, including an array. So you make an array of type Variant , and assign to each of

Do jagged arrays exist in C/C++?

由 情到浓时终转凉″ 提交于 2019-11-26 05:56:16
问题 Is there such a thing as a jagged array in C or C++? When I compile this: int jagged[][] = { {0,1}, {1,2,3} }; I get this error: error: declaration of `jagged\' as multidimensional array must have bounds for all dimensions except the first 回答1: In C I would use an array of pointers. For instance: int *jagged[5]; jagged[0] = malloc(sizeof(int) * 10); jagged[1] = malloc(sizeof(int) * 3); etc etc. 回答2: There's a bunch of ways to do it. Here's another way: int jagged_row0[] = {0,1}; int jagged

How to convert list of arrays into a multidimensional array

由 一曲冷凌霜 提交于 2019-11-26 04:54:42
问题 I need to convert the following collection into double[,]: var ret = new List<double[]>(); All the arrays in the list have the same length. The simplest approach, ret.ToArray() , produces double[][], which is not what I want. Of course, I can create a new array manually, and copy numbers over in a loop, but is there a more elegant way? Edit: my library is invoked from a different language, Mathematica, which has not been developed in .Net. I don\'t think that language can utilize jagged

What are the differences between a multidimensional array and an array of arrays in C#?

由 天大地大妈咪最大 提交于 2019-11-25 22:16:28
问题 What are the differences between multidimensional arrays double[,] and array-of-arrays double[][] in C#? If there is a difference, what is the best use for each one? 回答1: Array of arrays (jagged arrays) are faster than multi-dimensional arrays and can be used more effectively. Multidimensional arrays have nicer syntax. If you write some simple code using jagged and multidimensional arrays and then inspect the compiled assembly with an IL disassembler you will see that the storage and
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