Questions tagged [vectors]

Vectors are sequence containers representing arrays that can change in size. For questions about geometric or algebraic vectors, use [coordinate-system] instead.

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Construct sparse Smolyak index matrix in Matlab [on hold]

I need to construct a matrix defined by two variables. The first, d is the dimensions and the second, l, is the level. The matrix has as many columns as the value of d. The elements of the rows are ...
14
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2answers
196 views

YAVI (Yet another vector implementation)

I am a C# game developer currently learning C++. I am trying to implement some simplified STL containers. Here is my implementation of vector, which does not have the allocator (because ...
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0answers
32 views

Leetcode Finding Maximum Area of Island Solution

Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You may assume all four edges of the grid are ...
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2answers
84 views

Quaternion and Vector3 transfomation Math

hi I have made and AI for my enemies which works perfectly but a particular section of code is repetitive and I feel that it can be optimised ...
2
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3answers
132 views

Modeling, view and projection transformation using vector and point in homogenous form

I know this is horrible code. This program is for performing modeling, view and projection transformation. The program reads input from scene.txt and outputs the <...
3
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1answer
48 views

Bin Numbers from stdin

I often like to get a feel for a text file containing a lot of numbers quickly by making a histogram. One can do this in plotting software like Gnuplot, but sometimes having something in the terminal ...
6
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1answer
129 views

STL-like vector implemention in C++

I attempt to write a STL-like vector, mostly to figure out how it works. I wonder which parts look weird or what I made stupid. Any kind of comment is appreciated: alloc.hpp ...
4
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3answers
112 views

Fast-resizing uint8 buffer

I wanted a buffer like std::vector<uint8_t> which is very fast at resizing, and it does not require byte initialization (it resizes to 16K, then to 2-4 bytes, ...
9
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2answers
125 views

Generic data structures in C

I'm new to C, and I thought a great way to learn would be to implement some generic data structures and algorithms. So far I've implemented a linked list and a dynamic array. Both are generic, the ...
5
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3answers
1k views

A STL-like vector implementation in C++

I'm implementing a STL-like vector with the essential functionalities. I would like to know what is good in this code and what is bad. In terms of everything (memory usage, functions implementations, ...
8
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2answers
124 views

Read file into vector<byte>

I need to read a range of bytes from a file and return it as a std::vector<std::byte>. My current code looks like this: ...
9
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2answers
1k views

Implement Own Vector Class in C++

I am preparing for an interview and came to know about this question: implement a vector class in C++. I thought of how I would write it an interview and included the code below. The things I know I ...
10
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3answers
229 views

C++20 standard compatible vector

I decided to write my own vector class template for learning purposes. My main goal was a correct interpretation of C++20 standard (as of n4810). I took some liberties and decided to use concepts ...
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1answer
79 views

Vector calculation in Rust

Hi I am trying to get into Rust by implementing a small library for vector calculations. I am mainly asking to point out whether I chose a valid approach. I also am interested in comments on the ...
4
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1answer
144 views

C# System.Numerics.Vector<T> Clamp

The software that I develop uses large floating-point arrays up to the maximum size that can be allocated in C#. I have a large number of algorithms such as convolutions and filters that get executed ...
1
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0answers
25 views

Average histogram combining multiple files and vector of vectors (in c++)

I run a program of simulation N times (I use each time a different random numbers to initialize it). The results of the program are stored in 2N directories: every run produces two approximations. The ...
6
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2answers
161 views

Simulation of a banking system with an Account class in C++

I have been learning C++ and recently I have started practicing classes. I made this simulation of a banking system with an Account class. I would like to hear feedback on my code, what is good - what ...
1
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1answer
52 views

Clone Vector in rust except at one index [closed]

Let's consider you want to clone all items of a vector orig except the item of index i should be taken from alternative value <...
4
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1answer
126 views

std::vector free list

I'm trying to implement a free list by using a std::vector as its growable buffer. The reason I made this instead of just adding/removing elements directly into a ...
2
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0answers
166 views

VBA array functions: push, pop, shift, unshift

I want to write my snake game procedurally, using as much windows call as I can so as to practice. Looking into GetAsyncKeyState to capture keyboard inputs and play sound functions. Also making a ...
7
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5answers
1k views

Vector-transposing function

I profiled a library I'm writing that uses vector transposes and found that I am spending a good bit of time doing the following transpose. I am using a std::vector ...
6
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1answer
750 views

Implementation of thread-safe vector

I have implemented a thread safe vector, based on std::thread and std::vector. I am new to many of the patterns used in threading and was wondering if there's a more efficient way the locking can be ...
4
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3answers
852 views

Get length of the longest sequence of numbers with the same sign

I need to get length of the longest sequence of numbers with the same sign. Assumes that zero is positive. For example: ...
11
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2answers
112 views

Dynamic vector of void* in C

I have implemented a simple dynamic vector library in C. It is a header-only library. Full library listing - void_vector.h: ...
8
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2answers
955 views

C++11 Vector with move semantics

I am practicing move semantics and placement new by writing a custom Vector class but I am not confident that I use them right. I would really appreciate some pieces of advice regarding my code. Here ...
9
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3answers
1k views

Simple re-implementation of std::vector

Here is a simple reimplementation of most of std::vector. I want to check if I implement it correctly but the standard libraries source code is not very readable ...
3
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2answers
144 views

Simple Matrix Template Class

I wanted to make a matrix template class to see if I can learn how to use templates, work on figuring out the indexing in loops, and making an interface so the user can know if an operation will work. ...
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1answer
62 views

Header-only vector implementation in C

I tried to make a generic, header-only vector thingy I can use in other projects in the future. I omitted documentation comments because it's already quite long. ...
8
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4answers
2k views

Most efficient way to find an entry in a C++ vector

I'm trying to construct an output table containing 80 rows of table status, that could be EMPTY or USED as below ...
4
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2answers
537 views

Data Structures for Counting Duplicates and using std::vector::erase

Problem Dupe detection for a vector of ints. I simply want a count of the unique input characters that occurred at least twice. The goal is to count a dupe only once and ignore that input character ...
1
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0answers
125 views

Qsort in C++ using vector

I tried to make a simple qsort() function in a functional way, it takes a vector and a bool pred() Suggestions as to make it more functional, optimize it, and/or ...
3
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2answers
186 views

Manipulating and maintaining vector

Background I wrote a function update_list_v2(). And this function "maintains" a sorted list, g_list. ...
8
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6answers
536 views

Removing by indices several elements from a vector

From a sorted vector of indices (toRemove), I would like to remove from another vector (v) the elements at these indices. Note ...
1
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1answer
230 views

Median of a Vector assignment

I've been reading Bjarne's Principles in Programming and was given some code to demonstrate the usage of vectors and how we can return specific values for certain functionality such as mean and median....
1
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1answer
69 views

Convert a type u16 number to a matrix (Vec<Vec<u8>> or array) of 4 x 4

I am a Rust newbie and I am not familiar with all the iterator options. This is what I have so far. How can I make this better or at least avoid collecting twice into a Vec? ...
2
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0answers
363 views

A multithreaded, growable vector with immutable elements, which has wait-free reads

I wrote a small vector with a few lines of unsafe Rust. The idea is to have a vector, which can be read from simultaneously, but it needs the ability to grow. To realize that, the storage is ...
3
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3answers
86 views

Calculate total, minimum, maximum and mean from a set of distances

I have only begun to learn C++ and am reading through the book, "Programming Principles and Practices Using C++". This bit of code is my attempt to complete exercise 3 at the end of chapter 4. The ...
1
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1answer
457 views

C++ - Radix sort implementation

I have the following radix sort implementation: ...
4
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2answers
226 views

A simple Vector implementation

Just made a simple Vec class, nothing fancy but I am open to suggestions for improvements. Of course, this is not suppose to replace or used for the same tasks as <...
10
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4answers
4k views

Basic iterator supporting vector implementation

On the fly, I just implemented this iterator supporting vector class to understand how range-based for loop works. It's really basic but let me know what can be improved. Vector.h ...
1
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2answers
68 views

Generic Vector Class using smart_pointers

I have decided to rewrite what I did here, following the suggestions to use smart pointers. I will rewrite the other data structures as well using smart pointers where appropriate. I just want to see ...
4
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2answers
515 views

std::vector for pods

I am learning c++ and read why we can't use realloc() in std::vector, but i think we can use realloc() for pods, so here is my attempt to write std::vector like class template specialized for PODs <...
3
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1answer
299 views

Thread-safe arraylist with get, put, add, remove functions

I am preparing for multithreading interview questions and I don't have much experience with multithreading. I referred some online article to come up with a solution. Is this solution appropriate? <...
13
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6answers
4k views

Modern Vector implementation

Please give me some feedback on my attempt at a vector. I wanted this to be the lowest level concept of a vector that I'm using, so I'm primarily concerned with speed, and I would build wrappers ...
3
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2answers
2k views

Snake Game in C++ using OOP

I am currently a student and I have an assignment in my OOP C++ course where I need to create a snake game using these specific requirements. I added some features into snake to fit these requirements ...
5
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1answer
74 views

Binary searching the turning point of a function

The problem You are given a list of \$ n \$ positive integers. Your task is to split the list into \$ k \$ subarrays so that the largest subarray sum is minimized. The input On the first line you ...
3
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2answers
145 views

Comment on the style of this C++ class for a 2D Vector

I wrote a template class for a 2D vector that is intended to provide 2D vector arithmetic to be used in a Physics simulation program. Note that x and y are public or ease of use since encapsulation ...
6
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2answers
116 views

Dynamically sized queue

This is my first deep dive into C, and I want to make sure that I'm not doing anything stupid. The code below creates an "Array List" of sorts, which automatically resizes itself. This code is meant ...
6
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1answer
448 views

Implementation of resizable array (Vector or ArrayList) in C

I've implemented a very simple resizable integer array in C, only including functionality to add and remove elements at various indexes. I haven't looked at using void pointers to handle any type of ...
3
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2answers
2k views

Sequential and parallel addition of 2 vectors

I have done sequential and parallel addition of 2 vectors that I have filled with some dummy values. I am also measuring the time of execution for both, sequential and parallel execution. ...