An array is a systematic arrangement of similar objects, usually in rows and columns.

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44 views

Converting a 1D character array to a 2D array in random order.

I define my character array (9 items) as the following: char arr[] = {'a', 'c', 'b', 'z', 'k', 'l', 'j', 'o', 'd'} From this array, I would like to create a 3x3 array, in which the characters are ...
-2
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0answers
49 views

Dotnet Core add Arraylist to Project [closed]

I just want to lern C# and need a ArrayList. First i add the System.Collections Package. But i can't find the ArrayList Class! Is there a package for the Arraylist in NuGet? And how is the easiest ...
0
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0answers
19 views

Javascript - Switching Array values and loading input values

Hey i'm alittle new to programming and i'm trying to make a battle simulator for a future text-based rpg for practice but i've run into a wall. In either Javascript or JQuery I need to set the value ...
2
votes
3answers
181 views

Why are arrays often treated as second-class citizens?

In many programming languages, arrays don't get as much attention as other data structures. In Java, there is no Array<T> type collection to make arrays feel more consistent, such as in ...
-3
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0answers
28 views

Parameter with Multidimensional array & params keyword

By using params keyword with 1D array in method declearation, we can pass variable number of arguments without populating arrays. Why it is compile time error when we use params keyword with ...
-2
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0answers
51 views

Lib to convert XML to JSON and arrays as lossless as possible

I'm trying to work with some input that has mixed data, raw strings, XML and markdown, get it into a php array to do some calculations over it. Most calculations are statistical data with the words, ...
-2
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0answers
76 views

How can I place an SQL Server query result into an array and then extract specific values from the array in PHP?

I have an SQL Server database which runs the following query: SELECT t_Addresses.Coord_X, t_Addresses.Coord_Y, t_Addresses.Cust_ID INTO #temptable --Hash prefix specifies a temporary table FROM ...
6
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3answers
111 views

What is the origin of counting from zero in programming languages?

This is a question which I have wondered (and been asked) about for a long time. In (most? all?) programming languages, an index begins at zero for an array, string, etc. I recognize it became ...
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1answer
106 views

What is the proper or recommended way to save String[]'s, Array's, ArrayList's and int[]'s to Android?

I've looked up this question many many times but keep seeing different answers, what is the BEST way to save array's? It seems ludicrously infantile that there is no standard or easy way to save ...
1
vote
1answer
19 views

How to map collection of unique large numbers to an array?

I have a list of unique 8 byte random ids and new ids are generated often. Let's say that the total number of ids can become at most N (let's say 100,000). Now, I want to map each of these ids to a ...
1
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4answers
213 views

Readability & Performance: Is it better to allow the Java garbage collector to clear a datastructure?

I work with large HashMap's and ArrayLists. When not needing them to be in memory any longer, I use myArray.clear(); to free up the memory. When my colleague saw that line, he changed it to myArray ...
-1
votes
1answer
77 views

Should I add 1 to my unknown string size when I create a char array to hold it via malloc? [closed]

When I have a string of unknown size and I create an char array to hold this string. I do something like this: #define LINE_END "\r\n" int line_end_size = strlen(LINE_END); char line[]="Hello! ...
-3
votes
1answer
125 views

Using System.out.println() with loops and arrays [closed]

Is there anyway I can create a loop for System.out.println("...") and reading in the values? For example I wish to do this: System.out.println("Input the Executive's name: "); String eName = ...
0
votes
0answers
54 views

Realizing pagination for merged array from multiple data sources (APIs)

I'm improving a WordPress theme with PHP. The theme contains a gallery section which loads data from the Flickr API. Now the client wants to display Flickr galleries as well as "local" galleries ...
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1answer
98 views

How to compare and replace value from two object inside array?

Here i want to replace price in data1 to price from data2, and it updated if the id is same. Is it possible to do that without nested loop? var data1 = [{ "id": "56e641d4864e5b780bb992c6", ...
1
vote
1answer
78 views

How to combine N non-comparable arrays up to an output limit in a fair way?

Given N non-comparable arrays of different sizes, what is the best method to combine them into one output array? Since the input arrays are non-comparable, a metric is needed to represent how ...
1
vote
4answers
76 views

Obtaining lists from an array

Let's say my array contains integers. I'd like to create lists, so that every list contains indexes where a particular value occured in the array. For instance, if the array was 5,0,3,5,2,5,3, we ...
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0answers
82 views

Why my greedy algorithm not working for merge stone problem

Merge Stone Problem: You have n piles of stones in a line. For example, [4, 1, 2] means 3 piles of stone, the first pile has 4 stones, the second pile has 1 stone, and so on. You task is to merge ...
0
votes
1answer
122 views

Is there ever a reason to use variable variables in PHP rather than an array? [closed]

Is there any situation where an array is not suitable but a variable variable is? I cannot think of one or find one on any Stack Programmer Q&A. <?php $foo = array(); for($i = 0;$i < 3; $i+...
0
votes
1answer
133 views

How to save tuplas values, to later search on it

Scenario I have some values of the type : (Name - Email) From this couples of data, I have to set a ArrayList of "Name" values,something like: |Name1|Name2| --- |NameN| to set a Spinner. (Ordered ...
2
votes
2answers
197 views

Merge sort and O(n log n) mystery

I read every explanation here but still not convinced. I think mergesort is n * n and I know I am wrong but not sure where. Here is what I think: Suppose we are sorting 8 elements and this is the ...
-1
votes
1answer
59 views

(Multidimensional array in C) How to make my output in a vertical position rather than in horizontal when the size of the array is n[3][4] [closed]

I would like to have some help. I must find a way that the output must be: A B C 90 60 80 50 100 70 100 20 100 10 50 75 Because the previous output is: A 90 50 100 10 B 60 100 ...
5
votes
2answers
180 views

How to store ordered information in a Relational Database

I am trying to understand how to properly store ordered information in a relational database. An example: Say I have a Playlist, consisting of Songs. Inside my Relational Database, I have a table of ...
4
votes
1answer
327 views

Why is Array.prototype designed to be a fully functional array?

In the below visualisation, There are two array objects(cars & bikes) that are created with below syntax, var cars = new Array("Saab", "Volvo", "BMW"); var bikes = ["Honda", "Yamaha"]; whose ...
-1
votes
1answer
174 views

eradicating the array = loop mindset [closed]

I have noticed a common issue in code reviews, that takes this form: // "arr" is an array for (i = 0; i < arr.length; ++i) { if (i == 3) { // do something with arr[i] } if (i ==...
14
votes
1answer
3k views

PHP: when to use arrays, and when to use objects for mostly-data-storing code constructs?

PHP is a mixed paradigm language, allowing to use and return non-object data types, such as arrays. I pose a question to try to clarify some guidelines for selection of arrays vs objects when deciding ...
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votes
2answers
196 views

3D array updating in C# [closed]

I'm curious because I have read that once an array is declared it can not be changed. Maybe if I lay out my thoughts. Say, I have a cube with dimensions 5x5x5 and I have a viewport that can rotate ...
21
votes
5answers
9k views

What's the use of .Any() in a C# List<>?

I've been discussing this with colleagues, and we couldn't figure out what the use is of .Any for any given List<>, in C#. You can check the validity of an element in the array like the ...
2
votes
3answers
322 views

Is it a good idea to modify the array keys in foreach

Some times I need to modify an array key for example something like: $temp = array(); foreach($arrayIWantToModify as $key => $value) { if($value % 2) == 0) { $temp['odd_' . $key] = $...
0
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0answers
40 views

Is it better to store integer data or array references in a javascript visualization?

Say I have a tree that I'd like to visualize with d3. Nodes have various attributes produced by the d3 library, attributes like an index and position variables. Now, I could add more attributes to ...
0
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0answers
62 views

Microcontroller oLED Display Buffering Optimizations or Alternatives For Speed?

I'm developing a UI/Layout for a 128 x 64 oLED Monochrome Pixel Display. I've got a small netMF microcontroller driving the display via SPI at 40mhz. I'm using some basic methods, like these here, to ...
1
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0answers
267 views

Why is deep plucking a bad idea?

Both underscore and lodash refuse to implement deep plucking, despite many requests from users and gists or modules that implement the feature. _([{o:{a:1}},{o:{a:43}},{o:{a:234}},{o:{a:23}}]).pluck("...
3
votes
1answer
758 views

sort multidimensional array recursively - is this reasonable

In a nutshell, I needed to traverse any number of dimensions of a multidimensional array (or not) and I wanted the process to be as predictable as possible (in order to proliferate the pattern ...
3
votes
2answers
101 views

Reducing a sequence of array modification operations (insert, sort, replace, remove)

Given a plain array of values, e.g. ["Apple", "Orange", "Banana", "Strawberry"] and a list of operations from the set of [insert, delete, sort and replace], e.g. [ {cmd: "insert", index: 2, ...
13
votes
1answer
447 views

Why using sizeof of type to calculate the number of elements in an array is considered inferior to using sizeof of an element?

I'm reading "King K.N's C programming" and I'm reading the following statement: We discussed using the expression sizeof(a)/sizeof(a[0]) to calculate the number of elements in an array. The ...
2
votes
2answers
161 views

How to create a 2D array at runtime in Ada? [closed]

In Ada programming, What is a best practice way to create a 2D array of a size that is specified by the user? I'm teaching myself Ada for work (after many years of C programming), and I'm having ...
2
votes
2answers
353 views

Find the maximum number of pairs of numbers that are in a range, between two arrays

Lets say I have two arrays A and B A = {1,2,3} B = {12,11,67} and have max sum value S = 10 How many maximum number of unique pairs can be formed between the two arrays who's sum is less than or ...
2
votes
1answer
340 views

Beginners C# question about Array.Reverse

I am sitting through a very well-explained and thorough video tutorial series, using Visual Studio 2012 as my developing environment. Anyway, one thing that is hard to figure out is this. Say you ...
1
vote
2answers
231 views

What is the algorithmic time complexity of this program?

I wrote a simple program in java to create and maintain Dynamic Arrays: public class DynamicArrays { private Integer[] input = new Integer[1]; private Integer length = 0; private Integer ...
3
votes
1answer
442 views

Why is iterating through List<T> more expensive than iterating through Array in .NET?

According to the answers in this post, List<T> is backed by an Array. According to this article, list iteration is considerably slower than array iteration. If Lists are arrays 'under the hood',...
0
votes
0answers
120 views

GMP Core Dump while using mpz_clear in C

I'm working on a prime factorization program written in C using the GMP library through cygwin. The algorithm that I have now works fine, but has memory leaks from not using the mpz_clear function on ...
1
vote
1answer
121 views

What is VLA and how it is implemented?

Most languages does support variable length arrays on the heap but I've heard that those can be stored on the stack too. I'm curios what languages support this construct, some examples and how are ...
1
vote
0answers
417 views

How to loop through array bidimensional in diagonal according to a position in degrees

The title could be no self-explanatory enough but I need some conceptual help in order to implement a solution to go through an array: I'm developing a program to calculate the "most shadepath" route ...
1
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2answers
277 views

Non-fixed-size Fenwick Tree implementation

I'm planning to implement a non-fixed-size Fenwick tree. That is, a Fenwick tree that allows interleaving range queries with adding/removing elements. All implementations and samples I've seen so far ...
3
votes
2answers
454 views

How to draw rectangles for 2D arrays

I have an 2D boolean array that looks like this: [0][0][0][0][0][0][0][0][0][0] [0][0][0][0][0][0][0][0][0][0] [0][0][0][0][0][0][0][0][0][0] [0][0][0][1][1][1][0][0][0][0] [0][0][0][1][1][1][0][0][0]...
3
votes
1answer
107 views

Why use atomic vectors or matrices in R at all?

In reading Hadley Wickham's Advanced R I learned about the difference between atomic vectors and lists; and matrices/arrays and dataframes. This is something I hadn't really appreciated before, and ...
-2
votes
3answers
3k views

How to store integer array in mysql database [closed]

I am making a college attendence system so i need to store attendence of thousands of students. if I go for 1 column for each day then it will take 12*30 almost 360 column for a year. So I want to ...
3
votes
3answers
524 views

How do you iterate through an array and delete an element?

I have an array and I can iterate through it. I know that it is impossible to change the size of an array; however, how do I take out a certain element that I not want in the array anymore? Example: ...
1
vote
2answers
59 views

Function that would output all distinct values in an array

I want to create a function that outputs the distinct values in a given array. For example, in the following sequence 2 2 1 1 5 2 , the distinct digits are 2 1 5. What I've done till now is: void ...