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double ramp(double x) { if (x > 0) return x; else return 0; } void unaryExprExample() { //unaryExpr is a const function so it will not give you the possibility to modify values in place Eigen::ArrayXd x = Eigen::ArrayXd::Random(5); std::cout<<x <<std::endl; x = x.unaryExpr([](double elem) // changed type of parameter { return elem < 0.0 ? 0.0 : 1.0; // return instead of assignment }); std::cout<<x <<std::endl; std::cout << x.unaryExpr(std::ptr_fun(ramp)) << std::endl; } |
