{"id":25072,"date":"2022-12-07T18:05:35","date_gmt":"2022-12-07T12:35:35","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-get-the-dot-product-of-two-vectors-by-functors-and-stl-algorithms\/"},"modified":"2022-12-07T18:05:35","modified_gmt":"2022-12-07T12:35:35","slug":"solved-get-the-dot-product-of-two-vectors-by-functors-and-stl-algorithms","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-get-the-dot-product-of-two-vectors-by-functors-and-stl-algorithms\/","title":{"rendered":"[Solved] Get the dot product of two vectors by functors and STL algorithms"},"content":{"rendered":"

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\n<\/p>\n

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Just use std::inner_product<\/a>:<\/p>\n

live demo<\/a><\/p>\n

#include <algorithm>\n#include <iostream>\n#include <iterator>\n#include <ostream>\n#include <numeric>\n#include <cstdlib>\n#include <vector>\n\nusing namespace std;\n\nint main()\n{\n    vector<int> v1,v2;\n    generate_n( back_inserter(v1), 256, rand );\n    generate_n( back_inserter(v2), v1.size(), rand );\n    cout << inner_product( v1.begin(), v1.end(), v2.begin(), 0 ) << endl;\n}\n<\/code><\/pre>\n
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Yes, that’s a good solution. But I don’t want to use any methods provided in numeric.h. <\/p>\n<\/blockquote>\n
Just define your own dot_product:<\/p>\n
live demo<\/a><\/p>\n
template<typename InputIterator1,typename InputIterator2,typename ValueType>\nValueType dot_product( InputIterator1 first, InputIterator1 last, InputIterator2 another, ValueType init)\n{\n    while(first!=last)\n    {\n        init += (*first) * (*another) ;\n        ++first;\n        ++another;\n    }\n    return init;\n}\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            1<\/span> <\/p><\/div>\n<\/div>\n
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solved Get the dot product of two vectors by functors and STL algorithms <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Just use std::inner_product: live demo #include <algorithm> #include <iostream> #include <iterator> #include <ostream> #include <numeric> #include <cstdlib> #include <vector> using namespace std; int main() { vector<int> v1,v2; generate_n( back_inserter(v1), 256, rand ); generate_n( back_inserter(v2), v1.size(), rand ); cout << inner_product( v1.begin(), v1.end(), v2.begin(), 0 ) << endl; } Yes, that’s a good solution. But … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,3070,761],"class_list":["post-25072","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-functor","tag-stl"],"yoast_head":"\n[Solved] Get the dot product of two vectors by functors and STL algorithms - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-get-the-dot-product-of-two-vectors-by-functors-and-stl-algorithms\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Get the dot product of two vectors by functors and STL algorithms - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Just use std::inner_product: live demo #include <algorithm> #include <iostream> #include <iterator> #include <ostream> #include <numeric> #include <cstdlib> #include <vector> using namespace std; int main() { vector<int> v1,v2; generate_n( back_inserter(v1), 256, rand ); generate_n( back_inserter(v2), v1.size(), rand ); cout << inner_product( v1.begin(), v1.end(), v2.begin(), 0 ) << endl; } Yes, that’s a good solution. 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