Mar 14, 2012 · 2 vector<vector> matrix (row, vector (col, 0)); This will initialize a 2D vector of rows=row and columns = col with all initial values as 0. No need to initialize and use resize. …

1 This code snippet copies one two-dimensional vector to another. And gives us a clear picture of how to initialize the 2D vector.

Your first method of declaring a vector will not create a 2D vector. It will create a vector of size M with default values N.

Feb 18, 2010 · I have a class Map that contains a 2d grid of data. I want to use vectors rather than arrays, and I was wondering what the best practices were for using 2d vectors. Should I have …

I have a 2D char vector: vector< vector<char> > matrix; I will read in a matrix as an input and store it in that vector. The size of my vector is fixed and is ROW x COL.

the cross product is a binary operation on two vectors in a three-dimensional Euclidean space that results in another vector which is perpendicular to the plane containing the two input vectors. …

How do I declare and initialize a 2d int vector in C++? Asked 15 years, 7 months ago Modified 8 years, 3 months ago Viewed 21k times

How do I find the size of a 2 dimensional vector? So far I have the following code which doesn't compile.

You don't have a "2d vector", you have a vector of vectors of int. If you remember that it's easy to see what you need to do: Push back a vector for each iteration of the outer loop.

Nov 23, 2009 · A 2D vector is a matrix, and so you'd need two iterator types: a row iterator and a column iterator. Row iterators would move "up" and "down" the matrix, whereas column …