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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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PHP explode and put into array

I have this line of string Fruits-banana|apple|orange:Food-fries|sausages:Desserts-ice cream|apple pie the : (colon) is the separator for the main topic, and the | is the separator for the different type of sub topics. I tried to explode it out and…
Sylph
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How to get indexOf location of a value in nested array in javascript?

Disclaimer: This question is NOT as same as this one. I have an example of nested array: var testArray = [ true, "", [ 1, {a: 2, b: [3, false]}, [2, []], null ], 4, undefined, [5, "test"], function() {} ]; How to get…
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How to get nested array length in Javascript?

I have an example of nested array: var testArray = [1,2,[3,4,[5,6],7],8,9,[10,11],12]; Here is my function for getting nested array length: Array.prototype.getLength = function() { var sum = 0; function getMultiLength(array) { for (count =…
Trung0246
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Unable to get all the common elements in multidimensional unsorted array

Criteria for solving the problem: Reduce the complexity to linear. I can only use Arrays with collection type of Comparable. Duplicates elements should be allowed. My concern: My snippet of code(methods for getting common elements(strings)):…
Fun-zin
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J: Coordinates with specific value

Let's say we have array 0 1 2 3 4 5 8 7 8 9 There are two indexes that have value 8: (i.10) ([#~8={) 0 1 2 3 4 5 8 7 8 9 6 8 Is there any shorter way to get this result? May be some built-in verb. But more important. What about higher…
Roman
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asort(src,dest) to a multidimensional array

I'm trying to abuse asort() (just because) to copy an array src to array dest, no problem there: $ awk 'BEGIN { split("first;second;third",src,";") # make src array for testing asort(src, dest, "@ind_num_asc") # copy array to dest …
James Brown
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In C/C++, is char* arrayName[][] a pointer to a pointer to a pointer OR a pointer to a pointer?

I understood multi-dimensional arrays as pointers to pointers, but perhaps I am wrong? For example, I though: char * var = char var[] char ** var = char* var[] or char var[][] char *** var = char var[][][] or char* var[][] or char** var[] Is…
Russel
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Confusion about pointers and multidimensional arrays

If the following is possible: MyFunction(int *array, int size) { for(int i=0 ; i
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numpy vectorize multidimensional function

I am having problems to vectorize a multidimensional function. Consider the following example: def _cost(u): return u[0] - u[1] cost = np.vectorize(_cost) >>> x = np.random.normal(0, 1,(10, 2)) >>> cost(x) Traceback (most recent call last): …
Donbeo
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Flatten/ravel/collapse 3-dimensional xr.DataArray (Xarray) into 2 dimensions along an axis?

I have a dataset where I'm storing replicates for different classes/subtypes (not sure what to call it) and then attributes for each one. Essentially, there are 5 subtype/classes, 4 replicates for each subtype/class, and 100 attributes that are…
O.rka
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np.ndarray with Periodic Boundary conditions

Problem To impose np.ndarray periodic boundary conditions as laid out below Details Wrap the indexing of a python np.ndarray around the boundaries in n-dimensions This is a periodic boundary condition forming an n-dimensional torus Wrapping only…
Alexander McFarlane
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Tensorflow nn.conv3d() and max_pool3d

Recently Tensorflow added support for 3d convolution. I'm attempting to train some video stuff. I have a few of questions: My inputs are 16-frame, 3-channel per frame .npy files, so their shape is: (128, 171, 48). 1) The docs for…
JohnAllen
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F# converting Array2D to array of arrays

In F# is there a concise way of converting a float[,] to float[][]? In case this seems like a stupid thing to do it is so I can use Array.zip on the resulting array of arrays. Any help greatly appreciated.
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iOS JSON Parsing, array with multiple array

I have a JSON array with multiple object and I don't know how do I grab the "url" tag as an NSArray or a NSDictionary and show that image url in Tableview. I can't change the JSON data format.How should I do this? Here is what the JSON response…
Mukesh
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Is using realloc() on a dynamically allocated 2D array a good idea?

I am mainly interested in the viability of shrinking such an array. I'm working on a project where I have used single malloc() calls to each create individual moderately large 2D arrays. (Each only few tens of MiB, at the largest.) The thing is that…
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