求帮忙

eastsq是5.x版中的函数
现在可以改用lsqnonlin
from
http://forum.chinavib.com/thread-39259-1-1.html

我这个很成功啊
x=lsqnonlin('ct',x0);x0=[10,0.5,1]
x=lsqnonlin('ct',x0)
tt=0:1:16
yy=x(1).*(exp(-x(2).*tt-exp(-x(3).*tt)))
plot(tt,yy,'g')
hold on
t=[0.25 0.5 0.75 1 1.5 2 2.5 3 3.5 4 4.5 5 6 7 8 9 10 11 12 13 14 15 16];
c=[30 68 75 82 82 77 68 68 58 51 50 41 38 35 28 25 18 15 12 10 7 7 4];
plot(t,c,'*');
---------------------------------------------------------------------------------------------------
Local minimum possible.
lsqnonlin stopped because the final change in the sum of squares relative to
its initial value is less than the default value of the function tolerance.
<stopping criteria details>
x0 =
10.000000000000000 0.500000000000000 1.000000000000000
Local minimum possible.
lsqnonlin stopped because the final change in the sum of squares relative to
its initial value is less than the default value of the function tolerance.
<stopping criteria details>
x =
1.0e+02 *
1.144329798733395 0.001855026599955 0.020079185487858
tt =
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
yy =
Columns 1 through 5
42.097540687387031 83.114469396685266 77.552579063896403 65.435228877813827 54.470195438404758
Columns 6 through 10
45.260395813180679 37.598625877378694 31.232834096528201 25.944715244672928 21.551929938785296
Columns 11 through 15
17.902900183489198 14.871699772754498 12.353722109184519 10.262071737173208 8.524565746697952
Columns 16 through 17
7.081242757862674 5.882293654099964