http://yinfulin2008.blog.163.com/blog/static/37961257200932553944288/
>> x=10:100; >> y=[0.067,0.143,0.231,0.308,0.374]; >> p=polyfit(x,y,1); >> xx=0:20:100; >> plot(x,y,\'o\',xx,polyval(p,xx)) >> poly2sym(p,\'x\') ans = 779/4000*x-5245792845961277/576460752303423488 >> vpa(ans,8) ans = .19475000*x-.91000000e-2 即y=0.19475x-0.0091