[P|functions] add gradient

python/dune/xt/functions/CMakeLists.txt

@@ -22,6 +22,7 @@ dune_pybindxi_add_module(_functions_function_as_grid_function EXCLUDE_FROM_ALL f
 dune_pybindxi_add_module(_functions_function_interface_1d EXCLUDE_FROM_ALL function-interface-1d.cc)
 dune_pybindxi_add_module(_functions_function_interface_2d EXCLUDE_FROM_ALL function-interface-2d.cc)
 dune_pybindxi_add_module(_functions_function_interface_3d EXCLUDE_FROM_ALL function-interface-3d.cc)
+dune_pybindxi_add_module(_functions_gradient EXCLUDE_FROM_ALL gradient.cc)
 dune_pybindxi_add_module(_functions_gridfunction EXCLUDE_FROM_ALL gridfunction.cc)
 dune_pybindxi_add_module(_functions_indicator EXCLUDE_FROM_ALL indicator.cc)
 dune_pybindxi_add_module(_functions_interfaces_grid_function_1d EXCLUDE_FROM_ALL interfaces/grid-function_1d.cc)

python/dune/xt/functions/__init__.py

@@ -28,6 +28,7 @@ for mod_name in (
         '_functions_divergence',
         '_functions_function_as_grid_function',
         '_functions_function_interface_3d',
+        '_functions_gradient',
         '_functions_gridfunction',
         '_functions_indicator',
         '_functions_interfaces_grid_function_1d',

python/dune/xt/functions/gradient.cc

+// This file is part of the dune-xt project:
+//   https://github.com/dune-community/dune-xt
+// Copyright 2009-2018 dune-xt developers and contributors. All rights reserved.
+// License: Dual licensed as BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
+//      or  GPL-2.0+ (http://opensource.org/licenses/gpl-license)
+//          with "runtime exception" (http://www.dune-project.org/license.html)
+// Authors:
+//   Felix Schindler (2019)
+
+#include "config.h"
+
+#include <string>
+#include <vector>
+
+#include <dune/common/parallel/mpihelper.hh>
+
+#include <dune/pybindxi/pybind11.h>
+#include <dune/pybindxi/functional.h>
+#include <dune/pybindxi/stl.h>
+
+#include <dune/xt/common/string.hh>
+#include <dune/xt/grid/gridprovider/provider.hh>
+#include <dune/xt/grid/type_traits.hh>
+#include <dune/xt/functions/base/derivatives-of-grid-functions.hh>
+
+#include <python/dune/xt/common/parameter.hh>
+#include <python/dune/xt/common/fvector.hh>
+#include <python/dune/xt/common/fmatrix.hh>
+#include <python/dune/xt/common/bindings.hh>
+#include <python/dune/xt/grid/traits.hh>
+#include <python/dune/xt/common/exceptions.bindings.hh>
+
+namespace Dune {
+namespace XT {
+namespace Functions {
+namespace bindings {
+
+
+template <class G, class E>
+class GradientGridFunction
+{
+  using GP = XT::Grid::GridProvider<G>;
+  static const size_t d = G::dimension;
+
+public:
+  using type = Functions::GradientGridFunction<GridFunctionInterface<E>>;
+  using base_type = Functions::GridFunctionInterface<E, d>;
+  using bound_type = pybind11::class_<type, base_type>;
+
+public:
+  static bound_type bind(pybind11::module& m,
+                         const std::string& grid_id = Grid::bindings::grid_name<G>::value(),
+                         const std::string& layer_id = "",
+                         const std::string& class_id = "gradient_grid_function")
+  {
+    namespace py = pybind11;
+    using namespace pybind11::literals;
+
+    std::string class_name = class_id;
+    class_name += "_" + grid_id;
+    if (!layer_id.empty())
+      class_name += "_" + layer_id;
+    class_name += "_to_" + Common::to_string(size_t(d)) + "d";
+    const auto ClassName = Common::to_camel_case(class_name);
+    bound_type c(m, ClassName.c_str(), Common::to_camel_case(class_id).c_str());
+    c.def(py::init([](const Functions::GridFunctionInterface<E>& grid_function, const std::string& logging_prefix) {
+            return new type(grid_function, logging_prefix);
+          }),
+          "grid_function"_a,
+          "name"_a = "GradientGridFunction");
+
+    m.def(
+        "gradient",
+        [](const GridFunctionInterface<E>& grid_function, const std::string& name) {
+          return new type(grid_function, name);
+        },
+        "grid_function"_a,
+        "name"_a = "GradientGridFunction");
+
+    return c;
+  }
+}; // class GridFunction
+
+
+} // namespace bindings
+} // namespace Functions
+} // namespace XT
+} // namespace Dune
+
+
+template <class GridTypes = Dune::XT::Grid::AvailableGridTypes>
+struct GradientGridFunction_for_all_grids
+{
+  using G = typename GridTypes::head_type;
+  using GV = typename G::LeafGridView;
+  using E = Dune::XT::Grid::extract_entity_t<GV>;
+
+  static void bind(pybind11::module& m)
+  {
+    using Dune::XT::Functions::bindings::GradientGridFunction;
+    using Dune::XT::Grid::bindings::grid_name;
+
+    GradientGridFunction<G, E>::bind(m, grid_name<G>::value());
+
+    GradientGridFunction_for_all_grids<typename GridTypes::tail_type>::bind(m);
+  }
+};
+
+template <>
+struct GradientGridFunction_for_all_grids<boost::tuples::null_type>
+{
+  static void bind(pybind11::module& /*m*/) {}
+};
+
+
+PYBIND11_MODULE(_functions_gradient, m)
+{
+  namespace py = pybind11;
+
+  py::module::import("dune.xt.common");
+  py::module::import("dune.xt.grid");
+  py::module::import("dune.xt.la");
+  py::module::import("dune.xt.functions._functions_interfaces_grid_function_1d");
+  py::module::import("dune.xt.functions._functions_interfaces_grid_function_2d");
+  py::module::import("dune.xt.functions._functions_interfaces_grid_function_3d");
+  py::module::import("dune.xt.functions._functions_gridfunction");
+
+  GradientGridFunction_for_all_grids<>::bind(m);
+} // PYBIND11_MODULE(...)