我有形如： 
    6                12            18                24                30(X1)
40    0.86401187    0.866099157    0.867398348    0.86937554    0.870896092
60    0.854009255    0.855680665    0.857071684    0.858549464    0.859949833
80    0.83886257    0.840435757    0.841817144    0.84312376    0.84447422
100    0.819346113    0.821072474    0.822730598    0.824357519    0.825876722
120    0.799431577    0.80125399    0.802904876    0.804598692    0.806227141   (y)
(x2)
的一组数据
只不过x１有１００个，x２有８个．
采用nlinfit()函数进行回归．
但不知道怎样构建x矩阵？
我试过x=[x1;x2],但显示的变量很奇怪．
哪位好心的大侠帮帮忙，先谢谢啦！
[em1][em1]