clustering.py 文件源码

def convert_kappa_std(kappa,deg=True):
    '''This converts kappa from the von Mises distribution into a
    standard deviation that can be used to generate a similar normal
    distribution

    SH: 14June2013
    '''
    R_bar = spec.iv(1,kappa)/spec.iv(0,kappa)
    if deg==True:
        return np.sqrt(-2*np.log(R_bar))*180./np.pi
    else:
        return np.sqrt(-2*np.log(R_bar))