Class ConductorModel

mne/bem.py:85–117

BEM or sphere model. See :func:`~mne.make_bem_model` and :func:`~mne.make_bem_solution` to create a :class:`mne.bem.ConductorModel`.

class ConductorModel(dict):
    """BEM or sphere model.

    See :func:`~mne.make_bem_model` and :func:`~mne.make_bem_solution` to create a
    :class:`mne.bem.ConductorModel`.
    """

    def __repr__(self):  # noqa: D105
        if self["is_sphere"]:
            center = ", ".join(f"{x * 1000.0:.1f}" for x in self["r0"])
            rad = self.radius
            if rad is None:  # no radius / MEG only
                extra = f"Sphere (no layers): r0=[{center}] mm"
            else:
                extra = (
                    f"Sphere ({len(self['layers']) - 1} layer{_pl(self['layers'])}): "
                    f"r0=[{center}] R={rad * 1000.0:1.0f} mm"
                )
        else:
            extra = f"BEM ({len(self['surfs'])} layer{_pl(self['surfs'])})"
            extra += f" solver={self['solver']}"
        return f"<ConductorModel | {extra}>"

    def copy(self):
        """Return copy of ConductorModel instance."""
        return deepcopy(self)

    @property
    def radius(self):
        """Sphere radius if an EEG sphere model."""
        if not self["is_sphere"]:
            raise RuntimeError("radius undefined for BEM")
        return None if len(self["layers"]) == 0 else self["layers"][-1]["rad"]


def _calc_beta(rk, rk_norm, rk1, rk1_norm):