centroid_it2fs.py 文件源码

def mg(x, xmf, umf=[0, 1, 1, 0]):
    """Function to compute the membership grades of each x on a T1 FS

    x: list of x values
    xmf: x parameters of the membership function
    umf: u parameters of the membership function
    """

    items = [item for item in sorted(zip(xmf, umf))]
    xmf = [i[0] for i in items]
    umf = [i[1] for i in items]

    u = [None] * len(x)  # membership grade of x
    for i, p in enumerate(x):
        if p <= xmf[0] or p >= xmf[-1]:
            u[i] = 0
        else:
            x_mf = np.array(xmf)
            left = np.nonzero(x_mf < p)[0][-1]
            right = left + 1
            u[i] = umf[left] + (umf[right] - umf[left]) * (p - xmf[left]) / (xmf[right] - xmf[left])

    return u