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t=[0,10,20,30,60,120,240,360,540,1080]';
y=[0,53.81,44.73,46.91,58.07,39.55,23.88,25.52,22.66,23.04]';
ft_ = fittype'('a1*exp(a2*t)+a3*exp(a4*t)+a5)',...
    'dependent',{'y'},'independent',{'t'},...
    'coefficients',{'a1', 'a2', 'a3','a4','a5'});
st=[8000 150000 0.2]
[curve, goodness]= fit(t,y,ft_,'Startpoint',st)
figure
plot(curve,'predobs',0.95);
hold on,plot(t,y,'b*')


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bjd1234

½ð³æ (ÕýʽдÊÖ)

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fittype'('a
¶àÁ˸ö ' ·ûºÏ°É, Ó¦¸ÃÊÇfittype('a
2Â¥2013-06-05 15:55:33
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Óîð©ÎÄ

½ð³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by bjd1234 at 2013-06-05 15:55:33
fittype'('a
¶àÁ˸ö ' ·ûºÏ°É, Ó¦¸ÃÊÇfittype('a

È¥µô»¹ÊDz»Ðе쬣¬ÔËÐдíÎó
ͨ²ÅÒª½¨Á¢ÔÚר²ÅµÄ»ù´¡ÉϲÅÓÐÒâÒå
3Â¥2013-06-05 16:00:06
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

bjd1234

½ð³æ (ÕýʽдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

fittype('a1*exp(a2*t)+a3*exp(a4*t)+a5'
4Â¥2013-06-05 16:12:59
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Óîð©ÎÄ

½ð³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
4Â¥: Originally posted by bjd1234 at 2013-06-05 16:12:59
fittype('a1*exp(a2*t)+a3*exp(a4*t)+a5'

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5Â¥2013-06-05 16:19:22
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

feixiaolin

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