.. _basic_functions_map: ``map`` ------- Header: ``"NeoFOAM/fields/fieldFreeFunctions.hpp"`` Description ^^^^^^^^^^^ The function ``map`` applies a function to each element of the field or a subfield if a range is defined. Definition ^^^^^^^^^^ .. doxygenfunction:: NeoFOAM::map Example ^^^^^^^ .. code-block:: cpp // or any other executor CPUExecutor, SerialExecutor NeoFOAM::Executor = NeoFOAM::GPUExecutor{}; NeoFOAM::Field<NeoFOAM::scalar> field(exec, 2); NeoFOAM::map(field, KOKKOS_LAMBDA(const std::size_t i) { return 1.0; }); NeoFOAM::map(field, KOKKOS_LAMBDA(const std::size_t i) { return 2.0; }, {1, 2}); // apply a function to a subfield // copy to host auto hostField = field.copyToHost(); for (auto i = 0; i < field.size(); ++i) { std::cout << hostField[i] << std::endl; } // prints: // 1.0 // 2.0