Vector assignment crashing

by

In addition to what @Saurav posted, newMatrix is empty so you cannot assign values to newMatrix[i][j]. You can fix this by initializing the vectors with a given size:

vector< vector<int> > resizeVector(vector< vector<int> > m)
{
    vector< vector<int> > newMatrix(m.size());
    int i,j;

    for (i = 0; i < m.size(); i++)
    {
        newMatrix[i].resize(m[i].size());
        for(j = 0; j < m[i].size(); j++)
        {
            newMatrix[i][j] = m[i][j];
        }
    }
    return (newMatrix);
}

Before the for-loops we initialize newMatrix to have m.size() many empty vectors inside of it (the vectors are empty due to their default constructor). During each iteration of the outer for-loop we ensure that each vector within newMatrix has the correct size using the resize member function.

Note that if you want a copy of a vector you can simply just write:

vector< vector<int> > newMatrix(m);

More Related Contents:

  1. dynamical two dimension array according to input
  2. Vector of Vectors to create matrix
  3. What are the Issues with a vector-of-vectors?
  4. Get the first column of a matrix represented by a vector of vectors
  5. C++ Matrix Class
  6. How to enforce move semantics when a vector grows?
  7. What is the easiest way to initialize a std::vector with hardcoded elements?
  8. std::vector versus std::array in C++
  9. Best way to extract a subvector from a vector?
  10. How to avoid memory leaks when using a vector of pointers to dynamically allocated objects in C++?
  11. c++ vector size. why -1 is greater than zero
  12. Arrays vs Vectors: Introductory Similarities and Differences [closed]
  13. Vectors and polymorphism in C++
  14. Does vector::erase() on a vector of object pointers destroy the object itself?
  15. Vectors in Arduino
  16. C++ for-loop – size_type vs. size_t
  17. Bjarne Stroustrup says we must avoid linked lists
  18. Reorder vector using a vector of indices [duplicate]
  19. C++ std::vector vs array in the real world
  20. Vector that can have 3 different data types C++
  21. c++: can vector contain objects of type Derived?
  22. Loop until integer input is in required range fails to work with non-digit character inputs
  23. Why can’t I create a vector of lambdas (of the same type) in C++11?
  24. How to downsize std::vector?
  25. Is std::vector memory freed upon a clear?
  26. Getting a vector into a function that expects a vector
  27. How can I get the maximum or minimum value in a vector?
  28. Initializing a ublas vector from a C array
  29. How to erase & delete pointers to objects stored in a vector?
  30. C++ trying to swap values in a vector

Leave a Comment