diff options
author | Gael Guennebaud <g.gael@free.fr> | 2015-07-20 13:57:55 +0200 |
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committer | Gael Guennebaud <g.gael@free.fr> | 2015-07-20 13:57:55 +0200 |
commit | 6544b49e59f6f43c9183bf0d15d74267f5070137 (patch) | |
tree | 140eff6e3e17fc7681dfefda759ec0a2f3591836 /Eigen/src/Core/GlobalFunctions.h | |
parent | 2d93060291f3373a3325413159062a3b4d1e95e8 (diff) |
Generalize pow(x,e) such that x and e can be a different expression type or a scalar for either x or e. Add x.pow(e) with e an array expression.
Diffstat (limited to 'Eigen/src/Core/GlobalFunctions.h')
-rw-r--r-- | Eigen/src/Core/GlobalFunctions.h | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/Eigen/src/Core/GlobalFunctions.h b/Eigen/src/Core/GlobalFunctions.h index 15d92b862..90d6b6e28 100644 --- a/Eigen/src/Core/GlobalFunctions.h +++ b/Eigen/src/Core/GlobalFunctions.h @@ -71,16 +71,46 @@ namespace Eigen return x.derived().pow(exponent); } - template<typename Derived> - inline const Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename Derived::Scalar>, const Derived, const Derived> - pow(const Eigen::ArrayBase<Derived>& x, const Eigen::ArrayBase<Derived>& exponents) + /** \returns an expression of the coefficient-wise power of \a x to the given array of \a exponents. + * + * This function computes the coefficient-wise power. + * + * Example: \include Cwise_array_power_array.cpp + * Output: \verbinclude Cwise_array_power_array.out + * + * \sa ArrayBase::pow() + */ + template<typename Derived,typename ExponentDerived> + inline const Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename ExponentDerived::Scalar>, const Derived, const ExponentDerived> + pow(const Eigen::ArrayBase<Derived>& x, const Eigen::ArrayBase<ExponentDerived>& exponents) { - return Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename Derived::Scalar>, const Derived, const Derived>( + return Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename ExponentDerived::Scalar>, const Derived, const ExponentDerived>( x.derived(), exponents.derived() ); } + /** \returns an expression of the coefficient-wise power of the scalar \a x to the given array of \a exponents. + * + * This function computes the coefficient-wise power between a scalar and an array of exponents. + * Beaware that the scalar type of the input scalar \a x and the exponents \a exponents must be the same. + * + * Example: \include Cwise_scalar_power_array.cpp + * Output: \verbinclude Cwise_scalar_power_array.out + * + * \sa ArrayBase::pow() + */ + template<typename Derived> + inline const Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename Derived::Scalar>, const typename Derived::ConstantReturnType, const Derived> + pow(const typename Derived::Scalar& x, const Eigen::ArrayBase<Derived>& exponents) + { + typename Derived::ConstantReturnType constant_x(exponents.rows(), exponents.cols(), x); + return Eigen::CwiseBinaryOp<Eigen::internal::scalar_binary_pow_op<typename Derived::Scalar, typename Derived::Scalar>, const typename Derived::ConstantReturnType, const Derived>( + constant_x, + exponents.derived() + ); + } + /** * \brief Component-wise division of a scalar by array elements. **/ |