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What is the best way to concatenate two vectors?

I’m using multitreading and want to merge the results. For example: std::vector<int> A; std::vector<int> B; std::vector<int> AB; I want AB to have to ...

May 26, 2022
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How do I print the elements of a C++ vector in GDB?

I want to examine the contents of a std::vector in GDB, how do I do it? Let’s say it’s a std::vector<int> for the ...

May 26, 2022
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C++ STL Vectors: Get iterator from index?

So, I wrote a bunch of code that accesses elements in an stl vector by index...

May 25, 2022
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Is std::vector so much slower than plain arrays?

I’ve always thought it’s the general wisdom that std::vector is “implemented as an array,” blah blah blah. Today I went down and tested ...

May 24, 2022
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std::vector performance regression when enabling C++11

I have found an interesting performance regression in a small C++ snippet, when I enable C++11: #include <vector> struct Item { int a; ...

May 24, 2022
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Using arrays or std::vectors in C++, what’s the performance gap?

In our C++ course they suggest not to use C++ arrays on new projects anymore. As far as I know Stroustroup himself suggests ...

May 23, 2022
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numpy matrix vector multiplication [duplicate]

This question already has answers here: how does multiplication differ for NumPy Matrix vs Array classes? (8 answers) Closed 8 years ago. When ...

May 21, 2022
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Split a vector into chunks

I have to split a vector into n chunks of equal size in R. I couldn’t find any base function to do that. ...

May 20, 2022
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How to sum up elements of a C++ vector?

What are the good ways of finding the sum of all the elements in a std::vector? Suppose I have a vector std::vector<int> vector ...

May 16, 2022
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