用SciPy插值

我想用Scipy->interpolate->interp2d。插值的结果是正确的,但为什么结果会保存在列表中三次呢?我用了下一个脚本:

from scipy import interpolate import numpy as np

def main(): 
    x = np.array([1, 2, 3, 4])
    y = np.array([1, 2])
    z = np.array([[4,4,6,6],[6, 6,12, 12]])
    f = interpolate.interp2d(x, y, z, kind='linear', copy = False)

    xi = np.array([1.5, 2.5, 3.5])
    yi = np.array([1.5,1.5,1.

zi =[[ 5.  7.  9.][ 5.  7.  9.] [ 5.  7.  9.]]

你能帮帮我吗?