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Questions tagged [multidimensional-array]

Multidimensional-arrays can be described as multi-dimensional tables. Each index used in order to find a given element is called a dimension.

An array is typically a data structure meant to store a collection of elements to which is associated a given index. These elements are often in contiguous memory locations although this is not a requirement.

Multidimensional-arrays can be described as multi-dimensional tables. Each index used in order to find a given element is called a dimension.

Depending on the programming language, such a data structure can be achieved through a specific multi-dimension array data structure or in the shape of an "array of arrays" (also known as jagged arrays or Iliffe vector).

Multidimensional-arrays are often used to put values in a table format (e.g. rows and columns).

Tutorials:

This StackOverflow thread provides some insight on the difference between multi-dimensional arrays and jagged arrays in C#.

Wikipedia article.

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Pythonic way to generate random uniformly distributed points within hollow square lamina

Suppose we have a hollow square lamina of size n. That is, we have a nxn square from which a k*l rectangle has been removed (1<=k,l<=n-2). I want to calculate an average of distances between 2 random, uniformly distributed points within such hollow…
Nick Slavsky
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Creating multidimensional arrays & matrices in Javascript

Trying to create a function mCreate() that given a set a numbers returns a multidimensional array (matrix): mCreate(2, 2, 2) // [[[0, 0], [0, 0]], [[0, 0], [0, 0]]] When this functions handles just 2 levels of depth ie: mCreate(2, 2) //[[0,…
cmdv
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How to get the length of dynamically allocated two dimensional arrays in C

The question is how to get the length of dynamically allocated 2D Arrays in C? I thought the code below should get the number of rows, but it doesn't. char** lines; /* memory allocation and data manipulation */ int length; //the number of…
aminfar
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Complex merge technique: How to transpose specific sets of data using a configuration array?

I've been struggling the whole day to create a merge function for a multidimensional array. The scenario is a little different and tricky to describe in words. Instead I will try to explain it with a practical example. $actual_array = [ …
Basheer Kharoti
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Optimized "Multidimensional" Arrays in Ruby

From birth I've always been taught to avoid nested arrays like the plague for performance and internal data structure reasons. So I'm trying to find a good solution for optimized multidimensional data structures in Ruby. The typical solution would…
Justin L.
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typescript multidimensional array with different types

I have an custom object declared (ThreadObj) and I want to create a THREADLISTS, holding multiple arrays of Threadlist. So Threadlist:ThreadObj[]=[]; THREADLISTS:[ThreadObj[]][ThreadObj]=[][]; //how to type and init? The first dim is of ThreadObj[]…
Han Che
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How to count number of elements of a multidimensional array without using loop in PHP?

I have a an array like below: $array = Array ( '0' => Array ( 'num1' => 123, 'num2' => 456, ), '1' => Array ( …
Amit Rajput
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Practical use of N-Dimensional Arrays,where (N>3)

I have been programming for the last 8 years and now I was just wondering that if there is any practical use of N-Dimensional array,where N>3.I can only visualize of a data structure that is less than or equal to 3 dimensions.Has any one used more…
Emil
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Java - 2D array checking diagonal number board

Currently I'm working on a program that generates random 0's and 1's in a 8x8 2D array board. What I have to do is check whether or not if all the numbers on the diagonal are the same (starting from the corners, not just any…
Flinze
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2-d array using Python's array.array module?

array.array is a built-in type, looks like it will be much more efficient than list for some numerical tasks. In numpy I could create a 2-d array easily, for example: a = numpy.asarray([[1,2][3,4]], dtype='int') But I couldn't find how to create a…
avocado
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Python: NxM array of samples drawn from NxM normal distributions

I have two 2D arrays (or of higher dimension), one that defines averages (M) and one that defines standard deviations (S). Is there a python library (numpy, scipy, ...?) that allows me to generate an array (X) containing samples drawn from the…
Andrea
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Accessing rows of an array, inside an array of arrays?

Say i have: H = [array(a), array(b), array(c)...] a = [[1,2,3,4,5,6], [11,22,33,44,55,66], #row 1 of H[0] [111,222,333,444,555,666]] b = [[7,8,9,0,1,2], [77,88,99,00,11,22], [777,888,999,000,111,222]] c = ... I want to access…
layces
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sort an array base on key

i have an array like this: Array ( [0] => Array ( [title] => some title [time] => 1279231500 ) [1] => Array ( [title] => some title 2 [time] => 1279231440 ) …
greenbandit
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R subsetting and assigning in a multidimensional array

I am working with R with a 3D dimensional array. I am trying to use it like a set of 2D matrix for different time instants. I have find a behavior that I really don't understand and I will like to know why is happening. I have tried to find a…
Cohet
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Iterating through fields in a Nodejs MySQL result set

I'm a relative node newbie (old school programmer) I have working code to grab a result set and parse through rows. I'm using felx's node-mysql driver. It's not hard to specifically print out columns. connection.query('SELECT * FROM Company',…
Barry Smith
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