eigen/Cwise__array__power__array_8cpp_source.html

 Array<double,1,3> x(8,25,3),

                   e(1./3.,0.5,2.);

 cout << "[" << x << "]^[" << e << "] = " << x.pow(e) << endl; // using ArrayBase::pow

 cout << "[" << x << "]^[" << e << "] = " << pow(x,e) << endl; // using Eigen::pow

x
Array< double, 1, 3 > x(8, 25, 3)

e
Array< double, 1, 3 > e(1./3., 0.5, 2.)

Eigen::ArrayBase::pow
const GlobalUnaryPowReturnType< Derived, ScalarExponent > pow(const Eigen::ArrayBase< Derived > &x, const ScalarExponent &exponent)