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  • 2012-06-18 21:28:46, 134.98 K

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2Â¥2012-06-18 21:57:24
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dingd

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1stOptÇó½â£º
CODE:
Variable t,c;
ODEFunction c'=-k*(c-0.62);
Data;
0,0.75
2,0.7
3,0.65
4,0.64
5,0.62

²ÎÊý                  ×î¼Ñ¹ÀËã
--------------------        -------------
k        0.414791664003293
4Â¥2012-06-19 08:44:43
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yupeifeng

½ð³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
4Â¥: Originally posted by dingd at 2012-06-19 08:44:43
1stOptÇó½â£º

Variable t,c;
ODEFunction c'=-k*(c-0.62);
Data;
0,0.75
2,0.7
3,0.65
4,0.64
5,0.62


²ÎÊý                  ×î¼Ñ¹ÀËã
--------------------        -------------
k        0.414791664003293...

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yupeifeng: ½ð±Ò+2, ¡ïÓаïÖú 2012-06-19 11:16:23
Sample TextSample Text
ÎÒÊÇÕâôËãµÄ£¬ÏȰѹ«Ê½»¯³É-1*d(c-c')/dt=k(c-c');d(c-c')/(c-c')=-1*k*dt;
ln(c-c')=-k*t;c=exp(-k*t)+c';È»ºóÀûÓÃmatlab·ÇÏßÐÔ×îС¶þ³Ë·¨½øÐÐÄâºÏ£¬·½·¨ÈçÏÂÏȽ¨Á¢Ò»¸öÃûΪjackµÄº¯Êý£¬ÄÚÈÝ
function  c=jack(k,t)
c=exp(-k*t)+0.62;
È»ºóÔÚmatlabÖ÷´°¿ÚÖÐÊäÈët=[0,2,3,4,5];
c=[0.75,0.7,0.65,0.64,0.62];
[xx,res]=lsqcurvefit(@jack,[0],t,c)
½á¹ûΪxx=1.2359
res=0.7571
ÎÒ°ÑÄâºÏµÄº¯ÊýÓëÔ­Êý¾Ý½øÐжԱȷ¢ÏÖt=0µÄµã²»Ì«·ûºÏ£¬ÆäËûµÄ·ûºÏµÄ·Ç³£ºÃ£¬Îó²îËäÈ»ÊÇ0.7571µ«ÊÇÖ÷ÒªÊÇt=0µã´¦µÄÎó²î¡£ÏÂͼÊǶԱÈͼÆäÖкìÉ«ÊÇÄâºÏ³öÀ´µÄͼ¡£


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6Â¥2012-06-19 10:00:56
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csgt0

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function Untitled10
t0=[0 2 3 4 5];
c0=[0.75 0.7 0.65 0.64 0.62];
[a,b]=ode45(@kfcn,t0,0.75)
polytool(c0,b)
corrcoef(c0,b)
end

function dc=kfcn(t,c)
dc=-(c-0.62);
end

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