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

learn more… | top users | synonyms

4
votes
2answers
36 views

Vector Sort Function

I had heard about sorting for a while, but never actually gave it a try. So I decided to make an algorithm that would sort the members of a vector from least to greatest. Though this may seem pretty ...
6
votes
1answer
93 views

Comparing std::vector<bool> to std::vector<char>

A recent comment to an answer of mine here on Code Review brought up an interesting point. The comment was that one should use std::vector<char> over ...
8
votes
2answers
133 views

Vector Implementation C++

I have attempted to implement a similar version of the STL Vector; several functions are missing but I'd like a few words of advice on whether I am indeed on the right track or whether I should change ...
5
votes
2answers
84 views

Counting inversions in C++ via mergesort and vectors [closed]

I have a text file that contains 100,000 numbers from 1 ~ 100,000 in an unsorted manner (no duplicates). The name of the file is "IntegerArray.txt" My task is to count the number of inversions in ...
5
votes
2answers
84 views

Multiplayer BlackJack using Vector

This is a small program I wrote for GCSE computing, it operates using Vectors and that's pretty much it, wondering if you could tell me if there is anything I could do better. BlackJackv2.cpp ...
7
votes
4answers
1k views

Custom vector that uses less memory than std::vector

I'm using vectors to create matrix and the vector itself is consuming a large space. So I implemented a version that would use less memory and, if possible, be as fast or faster than ...
4
votes
2answers
156 views

Mean, Median and Mode of a QVector

I would like some help condensing this code down to size. I am trying to utilize Qt's container classes as efficiently as possible. I do not believe this code reflects my objective. ...
3
votes
2answers
47 views

Convert hex encoded string to byte array

The following should read a hex string such as "ece998a2fb" into vector 236 233 152 162 251. I was unable to find any built in ...
3
votes
1answer
106 views

Divide and Conquer algorithm for counting inversions

I've written a program that counts the number of inversions using a Divide and Conquer algorithm, written in C++11. ...
0
votes
2answers
114 views

Implementation of Vector in C++

This is a simple implementation of vector in C++. Please offer your reviews to improve the code. ...
3
votes
2answers
119 views

Creating n-dimensional mathematical vector classes through inheritance

Right now I have no knowledge of templates, but I just finished learning about inheritance, and wanted to apply it to a Vector3 class that I had already created. My ...
0
votes
0answers
26 views

Julia flattening lists of Vectors and Matrixes into arrays

For many Optimisation methods the parameters must be given as a single vector (Eg Optim.jl). But for many interesting functions the parameters/coeffients to be optimised are matrixes, or a mixture of ...
2
votes
0answers
29 views

Constant-space n-dimensional loops using dependent vectors

I designed this file after learning from this awesome answer from user2407038 on Stack Overflow. The idea of the module is to replace code like: ...
3
votes
3answers
82 views

Populating a vector with alternating numbers

This code inserts the number 4 into a vector's even indexes. ...
4
votes
1answer
98 views

Generic vector implementation in C using macros

I while ago I experimented with macros in C and came up with the idea of implementing a generic vector library using macros. This code uses the non standard typeof ...
4
votes
3answers
131 views

Writing huge 2D vectors to text file too slow

I have 10 large (34 million cell) 2D gridded vectors storing doubles. When written they are over 200 MB in size. I use an ofstream object to write them to a text ...
15
votes
2answers
282 views

How to speak Brainfuck: for beginners

The following code transforms multi-line input into the the Brainfuck equivalent. One line turns into one program. The resulting programs are split by newlines for readability. Brainf.cpp ...
2
votes
1answer
99 views

Passing functors to standard algorithms

I created 3 different implementations (which produce the same results) using the count_if function from STL. I wish to check the number of elements in the vector ...
2
votes
1answer
129 views

Second implementation of std::vector

Having already attempted an implementation of the std::vector class here, I decided to take the comments on board and also do some new bits myself (mainly the ...
3
votes
2answers
81 views

Fastest way to search istringstream for patterns in around 0.02 seconds

Problem I have a stream composed of 2 columns and 1000 lines: Column 1: contains the patterns that I want to find Column 2: contains the values corresponding the the patterns in Column1 I want to ...
5
votes
1answer
148 views

Implementation of std::vector class

I decided to implement the std::vector class in C++, and was wondering if I had done everything correctly. When I mean 'correctly', I mean that the code is ...
4
votes
3answers
108 views

`std::vector` 'substring concatenator'

The point of this is to concatenate a vector of std::strings into one string starting at an index of the vector. ...
2
votes
0answers
74 views

Serialize/deserialize a vector using insertion/extraction operators

I've never serialized a structure to a file before in C++, so I'm looking for critique on my first try at it. My main concerns are: It uses the streams space-delimited behavior. If a ...
4
votes
1answer
129 views

Self Implemented Hash Map Performance

I have written two hash map implementations, one that stores Vertices and one that stores self implemented vectors of Edges. They are all fully functioning, however in my application they are quite ...
3
votes
1answer
387 views

Calculating the determinant of a matrix

I wanted to do some exercise and came up with the idea of a good challenge (for my level of course). I tried to implement Laplace's algorithm for computing the determinant, recursively. ...
4
votes
1answer
291 views

Maximum sum subarray efficiency — divide and conquer w/ vectors

I have successfully implemented a divide and conquer approach for find the maximum sum subarray (see code below). The code works fine and is correct, however I have an efficiency problem in that in ...
2
votes
2answers
250 views

Using std::vectors to store textures

I need to write a TextureManager class which stores Texture objects; the problem is I'm using an ...
2
votes
1answer
66 views

Printing a multilevel container

I have these struct(s) to keep data about temperature measurement: ...
3
votes
1answer
278 views

Selecting variable amount of vector elements in C++

Suppose we are given a C++ vector. We want to specify a variable amount of indices and select elements from a vector being indexed. I have two implementation: (A) one relies on C++11 initializer ...
3
votes
0answers
105 views

C++ vector implementation errors

I haven't really programmed in C++ for about a year, and realised that I should get back into it, and tried my abilities out by remaking the STD vector class. However, my C++ is a bit rusty at the ...
1
vote
2answers
589 views

Defining std::vector::push_back(new Object)

Is this the best way to construct a vector of 2D points for return? I don't entirely understand new and delete so I'm concerned ...
7
votes
1answer
49 views

Managing initialization for a vector abstract data type in C

As an assignment, I was to create an \$n\$-dimensional vector type for \$n \le 20\$. This vector only has to support addition and scalar multiplication. I tried to write good code, with proper memory ...
4
votes
1answer
117 views

Vector implementation

This is a C++ Vector that I've made for the pleasure of it. It was made on a whim and is not related any school assignment or anything alike this. This Vector does ...
7
votes
2answers
778 views

Longest string in a vector — two implementations

I was given this piece of code, which calculates the length of the longest string in a vector of ...
3
votes
2answers
399 views

Wrapper function to do polynomial fits with gsl

I have two arrays of double, say x and y containing some physical data. I would like to find ...
2
votes
2answers
270 views

Basic myVector class raw vs smart pointer

I'm writing a myVector class for a class I'm taking. I don't believe I'm "strong" with smart pointers right now, so that's my question. This is just an excerpt ...
5
votes
1answer
183 views

Random interval generator for a game

I have been working on a few games which all have a need to create "events" randomly over time. The intervals need to get shorter as time goes on if the event is negative or they need to get longer ...
6
votes
2answers
126 views

Vector backed by memory pages

The purpose of this class is to wrap a std::vector in a class so that never a new object is added. We don't allocate a new object on the stack but we trying to fit ...
4
votes
1answer
975 views

Filling a container with objects using pointers / iterators

I have a series of nested objects that I need to serialize into a byte (unsigned char) array to send out to another computer over UDP. Right now I each object ...
2
votes
2answers
235 views

Speeding up and shortening a loop [closed]

I'm still relatively new to C++ and I've written a program that could do with being a bit shorter and faster. I use this same set of for loops many times to cycle through the whole tree of values. ...
3
votes
2answers
1k views

Read binary file by blocks

I wrote a function that allow me to read a binary file using 3 blocks what ever the length of file. I've decided to divide the length of my file into 3: block 1: ______________ block 2: ...
-1
votes
2answers
106 views

LinkedVector : a vector of elements with links to other elements

I wanted to have a vector with usual values and with some sort of indexing : an element can have links to other elements (via indices). Something like the following, where ...
7
votes
2answers
645 views

Sorted vector (aka flat_set) for objects (pointers) with custom embedded key (functor used)

BEFORE YOU READ: this link should be included when you just don't like the format of the question and for those that read this question for the first time, the link may give you the idea what happened ...
2
votes
2answers
83 views

Optimizing a particle filter weighted selection step

I have a vector with 10000 particles that I use in a Particle Filter. The problem is that it's taking too long to compute the weighted selection of the particles. I want to use a vector of weights ...
9
votes
3answers
16k views

STL vector implementation

I've implemented a simple vector-like structure. I would appreciate all criticism relevant to code, style, flow, camelCase vs underscore, and so forth. ...
5
votes
3answers
263 views

Determine whether one vector is a prefix of the other

Exercise 5.17: Given two vectors of ints, write a program to determine whether one vector is a prefix of the other. For vectors of unequal length, ...
6
votes
3answers
296 views

Inner product of random floats written to file

My goals are to make this code: faster more idiomatic C++ What the code does: take an integer command-line argument N make a vector of ...
8
votes
3answers
4k views

Storing words from an input stream into a vector

I'm extremely new to C++ and am doing the exercises on the book Accelerated C++. Here is one of the exercises: 4-5. Write a function that reads words from an input stream and stores them in a ...
4
votes
3answers
1k views

Avoiding object slicing within abstractions and their derivations

I've created a rudimentary example of the issue I'm inquiring about: Object slicing. I followed a post on Stack Overflow which provided a similar template - and for all intents and purposes, this ...