救命

422258511

syms t
  o, R1 z" G, i& v+ }x=2000/3*[3 10 20 30 40]';
7 q7 y0 @( L" P( c, L& ly=[780.8 696.8 669.6 639.2 585.6]';
f=fittype('a*exp(b*t)','independent','t','coefficients',{'a','b'});
cfun=fit(x,y,f);
xi=0:.1:20;
% J+ Q- z5 |) D; X5 s$ }yi=cfun(xi);
plot(x,y,'r*',xi,yi,'-b');

* j4 L5 d+ _: s" M' G. f怎么运行不了？急用，帮帮忙

422258511

呵呵，发货的司法看得见啊