vector

问题 imagine you got 2 vectors: vector<int> ar1, a2; ar1 = {1,1,2,3,3,4,5,5,6}; ar2 = {1,2,3,4,5,6}; how to do something like this in a good way (using C++) ? b = ar1 - ar2 // b = {1,3,5} 回答1: //from cppreference #include <iostream> #include <algorithm> #include <vector> #include <iterator> int main() { std::vector<int> v1 {1,1,2,3,3,4,5,5,6}; std::vector<int> v2 {1,2,3,4,5,6}; std::vector<int> diff; //no need to sort since it's already sorted std::set_difference(v1.begin(), v1.end(), v2.begin(),

问题 imagine you got 2 vectors: vector<int> ar1, a2; ar1 = {1,1,2,3,3,4,5,5,6}; ar2 = {1,2,3,4,5,6}; how to do something like this in a good way (using C++) ? b = ar1 - ar2 // b = {1,3,5} 回答1: //from cppreference #include <iostream> #include <algorithm> #include <vector> #include <iterator> int main() { std::vector<int> v1 {1,1,2,3,3,4,5,5,6}; std::vector<int> v2 {1,2,3,4,5,6}; std::vector<int> diff; //no need to sort since it's already sorted std::set_difference(v1.begin(), v1.end(), v2.begin(),

问题 I have a vector std::vector<std::vector<ContactPairs>> m_contactPairs; If I call m_contactPairs.push_back() or any other function that will resize the outermost vector, will the elements inside that vector have to reallocate (the inner elements in this case being std::vector<ContactPairs> ), or will the inner vectors just do a shallow copy and keep pointing at the same memory they already own? I'm using Visual Studio 2010, which is prior C++11, but has some of the functionality as extensions

问题 This question already has answers here : What are differences between std::string and std::vector<char>? (5 answers) C++: char test[100] vs array<char, 100> vs string (4 answers) Closed 5 years ago . It's known to everyone of us that we should prefer string class in C++ for all string applications due to the many special functions they perform & their ability to grow & reduce dynamically. What string is for characters , vector is for other data types & classes because it shows great

问题 This question already has answers here : What are differences between std::string and std::vector<char>? (5 answers) C++: char test[100] vs array<char, 100> vs string (4 answers) Closed 5 years ago . It's known to everyone of us that we should prefer string class in C++ for all string applications due to the many special functions they perform & their ability to grow & reduce dynamically. What string is for characters , vector is for other data types & classes because it shows great

问题 from gensim.models import word2vec sentences = word2vec.Text8Corpus('TextFile') model = word2vec.Word2Vec(sentences, size=200, min_count = 2, workers = 4) print model['king'] Is the output vector the context vector of 'king' or the word embedding vector of 'king'? How can I get both context vector of 'king' and the word embedding vector of 'king'? Thanks! 回答1: It is the embedding vector for 'king'. If you use hierarchical softmax, the context vectors are: model.syn1 and if you use negative

问题 from gensim.models import word2vec sentences = word2vec.Text8Corpus('TextFile') model = word2vec.Word2Vec(sentences, size=200, min_count = 2, workers = 4) print model['king'] Is the output vector the context vector of 'king' or the word embedding vector of 'king'? How can I get both context vector of 'king' and the word embedding vector of 'king'? Thanks! 回答1: It is the embedding vector for 'king'. If you use hierarchical softmax, the context vectors are: model.syn1 and if you use negative

问题 The result of a discussion with a colleague I ended up writing benchmarks to test std::vector vs raw dynamically allocated arrays, and ended up with a surprise. My tests are as follows: #include "testconsts.h" // defines NUM_INTS across all tests #include <vector> int main() { const int numInts = NUM_INTS; std::vector<int> intVector( numInts ); int * const intArray = new int[ numInts ]; ++intVector[0]; // force access to affect optimization ++intArray[0]; // force access to affect

问题 The result of a discussion with a colleague I ended up writing benchmarks to test std::vector vs raw dynamically allocated arrays, and ended up with a surprise. My tests are as follows: #include "testconsts.h" // defines NUM_INTS across all tests #include <vector> int main() { const int numInts = NUM_INTS; std::vector<int> intVector( numInts ); int * const intArray = new int[ numInts ]; ++intVector[0]; // force access to affect optimization ++intArray[0]; // force access to affect

问题 Background I have a container class which uses vector<std::string> internally. I have provided a method AddChar(std::string) to this wrapper class which does a push_back() to the internal vector. In my code, I have to add multiple items to the container some time. For that I have to use container.AddChar("First"); container.AddChar("Second"); This makes the code larger. So to make it more easier, I plan to overload operator <<. So that I can write container << "First" << "Second" and two