Method get_dft_array

python/simulation.py:4013–4055

Returns the Fourier-transformed fields as a NumPy array. The type is either `numpy.complex64` or `numpy.complex128` depending on the [floating-point precision of the fields](Build_From_Source.md#floating-point-precision-of-the-fields-and-materials-arrays). The DFT fields are centere

(
        self,
        dft_obj: DftObj = None,
        component: int = None,
        num_freq: int = None,
    )

        return arr

    def get_dft_array(
        self,
        dft_obj: DftObj = None,
        component: int = None,
        num_freq: int = None,
    ):
        """
        Returns the Fourier-transformed fields as a NumPy array. The type is either `numpy.complex64`
        or `numpy.complex128` depending on the [floating-point precision of the fields](Build_From_Source.md#floating-point-precision-of-the-fields-and-materials-arrays). The DFT fields are centered on the Yee-grid voxels using bilinear interpolation of the nearest Yee-grid points.

        + **`dft_obj` [ `DftObj` class ]** — A `dft_flux`, `dft_force`, `dft_fields`, or `dft_near2far` object
          obtained from calling the appropriate `add` function (e.g., `mp.add_flux`).

        + **`component` [ `component` constant ]**— The field component (e.g., `meep.Ez`).

        + **`num_freq` [ `int` ]** — The index of the frequency. An integer in the range `0...nfreq-1`,
          where `nfreq` is the number of frequencies stored in `dft_obj` as set by the
          `nfreq` parameter to `add_dft_fields`, `add_flux`, etc.
        """
        if not self.dft_objects:
            raise RuntimeError(
                "DFT monitor dft_obj must be initialized before calling get_dft_array"
            )

        if hasattr(dft_obj, "swigobj"):
            dft_swigobj = dft_obj.swigobj
        else:
            dft_swigobj = dft_obj

        if type(dft_swigobj) is mp.dft_fields:
            return mp.get_dft_fields_array(
                self.fields, dft_swigobj, component, num_freq
            )
        elif type(dft_swigobj) is mp.dft_flux:
            return mp.get_dft_flux_array(self.fields, dft_swigobj, component, num_freq)
        elif type(dft_swigobj) is mp.dft_force:
            return mp.get_dft_force_array(self.fields, dft_swigobj, component, num_freq)
        elif type(dft_swigobj) is mp.dft_near2far:
            return mp.get_dft_near2far_array(
                self.fields, dft_swigobj, component, num_freq
            )
        else:
            raise ValueError(f"Invalid type of dft object: {dft_swigobj}")

    def get_source(self, component, vol=None, center=None, size=None):
        """