如何利用Matlab拟合出函数关系曲线，并求出函数关系式，需要用幂函数关系

直接使用CFTOOL工具箱
命令行输入cftool即可，然后选择拟合类型
x=[6.69:0.02:7.53];
y=[4.2,3.7,3.3,2.95,2.63,2.33,2.11,1.87,1.65,1.47,1.32,1.17,1.04,0.925,0.82,0.735,0.653,0.582,0.52,0.462,0.412,0.366,0.325,0.289,0.258,0.23,0.205,0.182,0.162,0.145,0.129,0.115,0.102,0.091,0.081,0.072,0.064,0.057,0.051,0.0455,0.0403,0.036,0.032];
直接输入cftool进入曲线拟合工具箱界面“Curve Fitting tool”
(1）点击“Data”按钮，弹出“Data”窗口；
（2）利用X data和Y data的下拉菜单读入数据x,y，然后点击“Create data set”按钮，退出“Data”窗口，返回工具箱界面，这时会自动画出数据集的曲线图；
（3）点击“Fitting”按钮，弹出“Fitting”窗口；
（4）点击“New fit”按钮，可修改拟合项目名称“Fit name”，通过“Data set”下拉菜单选择数据集，然后通过下拉菜单“Type of fit”选择拟合曲线的类型，选择类型Power：幂逼近，有2种类型，a*x^b 、a*x^b + c