#!/usr/bin/env python3

import numpy as np
import matplotlib.pyplot as pp

min_err = 100

pre = np.array([1]*64 + [-1]*64)

while min_err > 10:
    pre = np.random.permutation( pre )
    c = np.correlate(pre, pre, mode='full')
    err = np.max(np.absolute(c[:127]))

    if err < min_err:
        min_err = err
        print(err)
        print(pre)
        pp.plot(c)
        pp.show()