matlab啊!懂的都看看吧..t=0:18;x=[9.6,18.3,29.0,47.2,71.1,119.1,174.6,257.3,350.7,441.0,...513.3,559.7,594.8,629.4,640.8,651.1,655.9,659.6,661.8];f=@(b,t)b(2).*b(3)./(b(3)+(b(2)-b(3)).*exp(-b(1).*t));[b1,r]=nlinfit(t(1:19),x(1:19),f,[0.5,660,9.
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