Questions tagged [array]
An array is an ordered data structure consisting of a collection of elements (values or variables), each identified by one (single dimensional array, or vector) or multiple indexes.
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Generate an array in Ruby efficiently [closed]
I often have a piece of code that creates an array of elements based on some code block and it goes like this
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Dyalog APL dyadic operator deriving ambivalent function to pair two function results
I'm writing a small utility operator which applies two functions to an argument pair and strands the results. The pair can either be given as two arguments or as a single argument with two elements. ...
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Code footprint of a std::array based container [closed]
I have a custom std::array based container (using class template argument deduction) and want to ask why this working implementation creates more footprint in ...
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The Matrix Winds In
The Problem: Given an N by M Matrix, Create an Anti-Clockwise Traversal Path that winds in all the way into the Matrix
Example: The Matrix is 9 by 5
Output:
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extracting values from an array of nested objects without duplicates
I have my solution for the below usecase but I would like to know whether is any other effective solution for the same.
My Data:
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Determine whether two arrays have the same elements with the same multiplicities
I have written a Python function called comp that checks whether two given arrays have the same elements, with the same multiplicities. The multiplicity of a member ...
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Optimizing the Dig Pow function
I have written a Python function to solve the Dig Pow problem, where the goal is to find a number k such that the sum of each digit of n raised to a specific and ...
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Given a sorted list of integers, find the highest count of elements between an indeterminate but fixed size range
I'm trying to optimize a function that takes a sorted list of integers and tells me what is the maximum number of elements in the list between any definite size range. To be clear, the range itself ...
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Merge Sorted Array in Rust
I was solving this task https://leetcode.com/explore/learn/card/fun-with-arrays/525/inserting-items-into-an-array/3253/
The main idea is to merge two sorted arrays (more details in the site)
Example:
<...
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swap two different length group of variable in array
The code below swaps two different-length groups of variables of the same array in the same array.
Is there any other method to achieve this that is less heavy or less redundant?
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concatenate values and delete the remaining rows using arrays
the below code used to:
Concatenate the values on a specific column "N" depend on the value of column "A" then delete the remaining rows.
It works, but with range of 30k rows the ...
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Mangle words to bytearray of lo/hibytes
I would like to refactor the following code snippet adapted from a project I'm involved. It is part of a code to control power outlets via network. The code snippet was written by myself based on the ...
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Custom array class in C++
I wrote a custom array class in C++ to suit my personal use case. The main important rule in this project is that no unassigned element is allowed between 2 assigned elements; please review for ...
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Extend native `Array` instances
I need/want to extend created array instance, to add extra methods that i see as useful.
class.labels.js
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PHP Fisher-Yates shuffle with random_int
The PHP manual states that the regular shuffle() function isn't cryptographically secure, but that random_int() is. I thought, ...
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Dynamic array type using void pointers C
I made my own dynamic array type using void pointers. I'd like to know what you think of my implementation. void pointers are nice but I fear they may be inefficient. The compiler cannot tell what ...
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Array List C implementation
I want to show you my implementation of the array list in C. Is there something I can improve or fix?
Header
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First attempt at making a sobel edge detection filter in c
I made a borders filter in C. It works properly, but I think it could be optimized and better designed; the formatting is abysmal. It uses too many lines for the border cases and has too many ...
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Bruteforce proof of an arithmetic expansion scheme expression in array lists (Java)
Given a list of, say, integers, one way to implement such a list is to rely on an array under the hood. When we are adding elements to the array list, we might need to make the internal array larger. ...
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Quick Sort Program
Quick sort is a sorting algorithm in which we select any random element as pivot from the array and we do the partition of the array around that pivot. Basically we place all the elements smaller than ...
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RGB Image Utility Class
I am writing a utility class to store RGB images and do a few utility functions as a way to learn C++.
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Iteratively paste values from spreadsheet tabs into empty spreadsheet
Basically below code is taking first 7 tabs from my current sheet and pasting them as values in a blank excel sheet with same tab names and saving them in a specific folder by filename I specified. ...
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Transform an array into object and set index for an unique key in javascript
I have a method that merges keys and indexes from an array into an object.
I'm stuck with ways to compress this method, and I don't know what I can do to make it simpler.
Goal
get an array of objects ...
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Printing Permutations
Following is a leetcode problem:
Given an array nums of distinct integers, return all the possible permutations. You can return all the possible permutations. You can return the answer in any order.
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Helper functions to get, set and remove from Firefox browser storage. Also, to get, push and remove from lists stored in the database
I am making a plugin for Firefox, this is (more or less) my first time working with JavaScript. Is this a reasonable design for working with both values and lists in a database?
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C generic typesafe dynamic array (vector) try 2
The previous generic dynamic array I asked a review for here was written using only the preprocessor and so while the array itself was type-safe, all the manipulating macros where not.
In this try I ...
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An implementation of Givens method for diagonalising symmetric matrices
So I tried to create a code which aims to diagonalise symmetric matrices via Givens algorithm. The program only works for symmetric matrices, for we know a symmetric matrix is always diagonalisable, ...
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Follow-up about computing lp norm with MPI
As pointed out in the answer by Victor Eijkhout to this question, the fact I am broadcasting the same vector to each process is against the MPI principles and, most importantly, will be a bottleneck ...
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Compute lp-norm of a vector in parallel with MPI
I'm trying to solve the following exercise:
Compute in parallel with MPI the lp norm of a vector of a predefined size N ...
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Swift - efficient array searching
I am trying to find a way to search an Int array (all numbers are > 0) and identify sequences where the sum of each element is a specific number. One element can ...
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Implementation of a two-dimensional array in C
I implemented a two-dimensional array in C and would like to know if the implementation is sound in terms of
Memory management
Potential bugs and other side effects that I missed
Code style (...
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How can I condense my code in node.js for sorting unique values within an array?
Kattis problem - ("I've been everywhere")
I would highly recommend looking at the problem through the link, however I will summarize it a bit here and explain the functionality of each part ...
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Robust input for lottery tickets
I've made a method that provides a robust way for a user to fill out a lottery ticket. During this process I found out that Java also provides syntax for labels. That was very astounding for me. But I ...
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C# Get All Diagonals Jagged Array
How can I improve this?
The idea is to store every left to right diagonals in a list
Not looking for a more efficient algorithm instead something readable, LINQ perhaps?
input:
3, 1
2, 5, 7
1, 5, 8, 3,...
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Multidimensional array in Java
I have this multidimensional array that generalizes vectors and matrices:
com.github.coderodde.util.MultidimensionalArray.java:
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Removing repeating rows and columns from 2d array
This is a real problem I had to fix recently. Imagine having generic array where you can have duplicate columns and rows.
You want to remove those duplicates as long as they are next to each other.
<...
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Array Implementation In JavaScript
Review
I have written my own implementation of Array in JavaScript with the basic functionalities. Can anyone please review this code and point out the mistakes/how to make the implementation better?
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delete multidimentional array value in php
I made a program that converts JSON to a PHP array and checks every value of the multidimensional array with a loop and if a value matches certain values then it deletes that key and value and ...
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N dimensional array index utility
I created the below class to help working with ND Arrays, mapping based on this question. This will help in implementing the code for handling convolutions.
How can I improve upon this? Is there ...
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Calculate sum of largest sequence of decreasing odd ints
I wrote a method that finds the maximum sum of consecutive decreasing sequence of odd integers.
For example: if sequence is 13 9 7 12 13 15 13, then sum is 29 (13 + 9 + 7).
I don't think it's as good ...
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How to split a file with multiple lines into fractional array elements?
I have a file with content:
4;10;3;6;10
6;9;1;3;5
3;2;1;1;2,65
I need to split each line of the file into an fractional (double) array with elements as these ...
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JavaScript BitArray Implementation
I am working on a project in which an array can easily grow beyond 50M in length. It's an array holding only boolean (0/1) ...
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Selection algorithms (order statistic) in Java: linear time vs. sorting selector vs. Quickselect
This post is about computing order statistics: given an array \$A\$ (not necessarily sorted), find the \$k\$th smallest array component. The entire repository is here.
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Generating random number of randomly sized Squares/Rectangles using numpy arrays
I made classes to use in generating square/rectangular shapes on a texture.
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SetTimeout to populate Javascript Object while a function looped AJAX requests to get data
I wrote some code that will get the name and data of a node or multiple of nodes and put them in an object (seriesData) so I can use said object for a chart (renderChart). I used setTimeout() so ...
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Unit testing for a multi-dimensional array class
I have designed a class bunji::Tensor which is a multi-dimensional array. I have designed it to have a similar interface to a multi-dimensional ...
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Implementation of a multi-dimensional array as a single memory buffer [Part 2]
A couple days ago I posted my first implementation of my data structure here, which implements a cache-optimized tensor representation. I have worked the ideas from the responses into my ...
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Implementation of a multi-dimensional array as a single memory buffer
There is an updated version of this code with some of the recommended changes made here.
I have created an implementation of a multi-dimensional array which utilizes a single continuous memory buffer ...
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