Function plot3

include/matplotlibcpp.h:535–617

template <typename Numeric>
void plot3(const std::vector<Numeric> &x,
                  const std::vector<Numeric> &y,
                  const std::vector<Numeric> &z,
                  const std::map<std::string, std::string> &keywords =
                      std::map<std::string, std::string>())
{
  detail::_interpreter::get();

  // Same as with plot_surface: We lazily load the modules here the first time 
  // this function is called because I'm not sure that we can assume "matplotlib 
  // installed" implies "mpl_toolkits installed" on all platforms, and we don't 
  // want to require it for people who don't need 3d plots.
  static PyObject *mpl_toolkitsmod = nullptr, *axis3dmod = nullptr;
  if (!mpl_toolkitsmod) {
    detail::_interpreter::get();

    PyObject* mpl_toolkits = PyString_FromString("mpl_toolkits");
    PyObject* axis3d = PyString_FromString("mpl_toolkits.mplot3d");
    if (!mpl_toolkits || !axis3d) { throw std::runtime_error("couldnt create string"); }

    mpl_toolkitsmod = PyImport_Import(mpl_toolkits);
    Py_DECREF(mpl_toolkits);
    if (!mpl_toolkitsmod) { throw std::runtime_error("Error loading module mpl_toolkits!"); }

    axis3dmod = PyImport_Import(axis3d);
    Py_DECREF(axis3d);
    if (!axis3dmod) { throw std::runtime_error("Error loading module mpl_toolkits.mplot3d!"); }
  }

  assert(x.size() == y.size());
  assert(y.size() == z.size());

  PyObject *xarray = detail::get_array(x);
  PyObject *yarray = detail::get_array(y);
  PyObject *zarray = detail::get_array(z);

  // construct positional args
  PyObject *args = PyTuple_New(3);
  PyTuple_SetItem(args, 0, xarray);
  PyTuple_SetItem(args, 1, yarray);
  PyTuple_SetItem(args, 2, zarray);

  // Build up the kw args.
  PyObject *kwargs = PyDict_New();

  for (std::map<std::string, std::string>::const_iterator it = keywords.begin();
       it != keywords.end(); ++it) {
    PyDict_SetItemString(kwargs, it->first.c_str(),
                         PyString_FromString(it->second.c_str()));
  }

  PyObject *fig =
      PyObject_CallObject(detail::_interpreter::get().s_python_function_figure,
                          detail::_interpreter::get().s_python_empty_tuple);
  if (!fig) throw std::runtime_error("Call to figure() failed.");

  PyObject *gca_kwargs = PyDict_New();
  PyDict_SetItemString(gca_kwargs, "projection", PyString_FromString("3d"));