y=2^x where x and y are vectors

denisfitzpatrick Registered Member Posts 3 Karma 0	y=2^x where x and y are vectors Thu May 17, 2012 6:27 pm Is the a non for loop way of doing: y=2^x where x and y are Vectors/ 1d Arrays Thanks, Denis
vak Registered Member Posts 23 Karma 0 OS	Re: y=2^x where x and y are vectors   Thu May 17, 2012 9:09 pm exp(x*log(2)) ?
manuels Registered Member Posts 47 Karma 0	Re: y=2^x where x and y are vectors Thu May 17, 2012 10:21 pm Code: Select all #include <Eigen/Core> #include <functional> #include <cmath> #include <iostream> int main() {   Eigen::Vector3d y;   Eigen::Vector3d x = Eigen::Vector3d::LinSpaced(1,3);   y = x.unaryExpr(std::bind1st( std::ptr_fun(pow), 2) );   std::cout << x << "\n\n" << y << std::endl; } Or a bit better to read (c++0x): Code: Select all #include <Eigen/Core> #include <functional> #include <cmath> #include <iostream> int main() {   Eigen::Vector3d y;   Eigen::Vector3d x = Eigen::Vector3d::LinSpaced(1,3);   auto powTo2 = std::bind1st(std::ptr_fun(pow), 2);   y = x.unaryExpr( powTo2 );   std::cout << x << "\n\n" << y << std::endl; }
denisfitzpatrick Registered Member Posts 3 Karma 0	Re: y=2^x where x and y are vectors Fri May 18, 2012 3:58 pm Thanks to both replies! Two different approaches and would have liked to accept both. Denis

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