matlab如何定义常数a,利用matlab进行分段拟合求一个常数a，拐点m，直线y=kx+b，数据如下...
x=[3.002211242.808197152.775708852.7006898472.4723278682.4274540752.3739750892.2834022742.2638442652.2115656952.1905355892.1860512772.1598687912.1598687912.1529243182.1482677332.1077860152.0893918732....
