def lambda2nu(lambda_):
    """
    Convert wavelength to optical frequency

    Parameters
    ----------
    lambda_ : array_like
        Wavelength(s) to be converted.

    Returns
    -------
    nu : float or array of floats
        Equivalent optical frequency.

    Notes
    -----
    Computes ``nu = c / lambda`` where c = 299792458.0, i.e., the
    (vacuum) speed of light in meters/second.

    Examples
    --------
    >>> from scipy.constants import lambda2nu, speed_of_light
    >>> lambda2nu(np.array((1, speed_of_light)))
    array([  2.99792458e+08,   1.00000000e+00])

    """
    return lambda_ / _np.asanyarray(c)
dataset/ETHPy150Open scipy/scipy/scipy/constants/constants.py/lambda2nu/swapped operands of `/`