def __init__(self, volumes, energies, eos='vinet'):
    "Init method.\n\n        volumes : array_like\n            Unit cell volumes where energies are obtained.\n            shape=(volumes, ), dtype='double'.\n        energies : array_like\n            Energies obtained at volumes.\n            shape=(volumes, ), dtype='double'.\n        eos : str\n            Identifier of equation of states function.\n\n        "
    self._volumes = volumes
    if (np.array(energies).ndim == 1):
        self._energies = energies
    else:
        self._energies = energies[0]
    self._eos = get_eos(eos)
    self._energy = None
    self._bulk_modulus = None
    self._b_prime = None
    try:
        (self._energy, self._bulk_modulus, self._b_prime, self._volume) = fit_to_eos(volumes, self._energies, self._eos)
    except TypeError:
        msg = [('Failed to fit to "%s" equation of states.' % eos)]
        if (len(volumes) < 4):
            msg += ['At least 4 volume points are needed for the fitting.']
        msg += ['Careful choice of volume points is recommended.']
        raise RuntimeError('\n'.join(msg))
Init method.

volumes : array_like
    Unit cell volumes where energies are obtained.
    shape=(volumes, ), dtype='double'.
energies : array_like
    Energies obtained at volumes.
    shape=(volumes, ), dtype='double'.
eos : str
    Identifier of equation of states function.
def __init__(self, volumes, energies, eos='vinet'):
    "Init method.\n\n        volumes : array_like\n            Unit cell volumes where energies are obtained.\n            shape=(volumes, ), dtype='double'.\n        energies : array_like\n            Energies obtained at volumes.\n            shape=(volumes, ), dtype='double'.\n        eos : str\n            Identifier of equation of states function.\n\n        "
    self._volumes = volumes
    if (np.array(energies).ndim == 1):
        self._energies = energies
    else:
        self._energies = energies[0]
    self._eos = get_eos(eos)
    self._energy = None
    self._bulk_modulus = None
    self._b_prime = None
    try:
        (self._energy, self._bulk_modulus, self._b_prime, self._volume) = fit_to_eos(volumes, self._energies, self._eos)
    except TypeError:
        msg = [('Failed to fit to "%s" equation of states.' % eos)]
        if (len(volumes) < 4):
            msg += ['At least 4 volume points are needed for the fitting.']
        msg += ['Careful choice of volume points is recommended.']
        raise RuntimeError('\n'.join(msg))