What is a Vector? | Vector Magnitude, Components & Examples
Nov 21, 2023 · A vector is a quantity that has both a direction and a magnitude. A magnitude is an abundance or a mathematical amount of something.
What are vectors and how are they used in programming?
I'm familiar with the mathematical/physics concept of a vector as a magnitude and a direction, but I also keep coming across references to vectors in the context of programming (for example C++ see...
Is std::vector so much slower than plain arrays? - Stack Overflow
Sep 8, 2010 · So array is twice as quick as vector. But after looking at the code in more detail this is expected; as you run across the vector twice and the array only once. Note: when you resize() the …
Iterate through a C++ Vector using a 'for' loop - Stack Overflow
Oct 3, 2012 · In Java, I would prefer a for-each loop or use iterators. Pretty much same as C++ although slightly different syntax.
Arrays vs Vectors: Introductory Similarities and Differences
Feb 26, 2013 · What are the differences between an array and a vector in C++? An example of the differences might be included libraries, symbolism, abilities, etc. Array Arrays contain a specific …
check if a std::vector contains a certain object? [duplicate]
Aug 10, 2010 · See question: How to find an item in a std::vector? You'll also need to ensure you've implemented a suitable operator==() for your object, if the default one isn't sufficient for a "deep" …
Why use a new call with a C++ 'vector'? - Stack Overflow
Feb 13, 2018 · std::vector<int>* v = new std::vector<int> v is a pointer to a dynamically allocated object, that dynamically allocates memory in order to store elements. As said already, you need to explictly …
std::vector versus std::array in C++ - Stack Overflow
Dec 12, 2010 · std::vector is a template class that encapsulate a dynamic array 1, stored in the heap, that grows and shrinks automatically if elements are added or removed. It provides all the hooks …
c++20 ranges view to vector - Stack Overflow
Jul 27, 2020 · 12 Now that the C++20 ranges implementation is actually here and released under GCC 10.2, I would like to know how to convert a ranges view back to an actual container, like a vector.
How to set initial size of std::vector? - Stack Overflow
Jul 12, 2012 · 187 I have a vector<CustomClass*> and I put a lot of items in the vector and I need fast access, so I don't use list. How to set initial size of vector (for example to be 20 000 places, so to …