May 12, 2012 · sorry to all, it was a mistake i did. I always created vector using its default constructor, never read that there is a constructor which takes two arguments, first one as the number of …

Undefined Behaviour !! } The default constructed vector, as in the example above creates an empty vector. Accessing elements outside of the range of the vector is Undefined Behavior. And don't …

Feb 10, 2010 · But you are right that if you want to initialize an empty vector and a non-empty vector you will have to use different constructs. Since C++11 this is a non-issue as you can use the initializer list …

Jun 21, 2012 · 75 There is no way to define a constant size vector. If you know the size at compile time, you could use C++11's std::array aggregate.

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 …

I would recommend a 1d vector implementation for a 2d vector if you don't require more space than std::vector<int>::max_size(). Here

61 std::vector has a fill constructor which creates a vector of n elements and fills with the value specified. a has the type std::vector<std::vector<int>> which means that it is a vector of a vector. Hence your …

Jul 15, 2012 · 89 c is not the abbreviation of vector in English, so why use c() to define a vector in R?

What you have initialized is a vector of vectors, so you definitely have to include a vector to be inserted ("Pushed" in the terminology of vectors) in the original vector you have named matrix in your example.

Feb 28, 2014 · How to initialize a vector with fixed length in R ?? For example, I want a vector of characters with length of 10??