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clc;clear;
X=[0.1 0.4 0.6 1 2 3 5 10 20 30];
Y=[4500 3800 3600 3300 3000 2950 2900 2800 2750 2700];
XX=log(X);   %%%  ÕâÒ»²½¿ÉÒÔ²»Òª£¬b=polyfit(log(XX),Y,1);Ò²¿ÉÒÔ
c=polyfit(XX,Y,1);   %%%  ½«ÇóµÃµÄϵÊý¸øÊý×éc
c(1,1)                 %%  ÄãÐèÒªµÄa
c(1,2)                   %%  ÄãÐèÒªµÄb
a=-300.3138*log(X)+ 3481.4   %%%  ÑéÖ¤Ò»ÏÂ
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4Â¥2013-11-17 16:28:38
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clc;clear;
X=[0.1 0.4 0.6 1 2 3 5 10 20 30];
Y=[4500 3800 3600 3300 3000 2950 2900 2800 2750 2700];
XX=log(X);

b=polyfit(XX,Y,1);
b(1:2)
a=-300.3138*log(X)+ 3481.4
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2Â¥2013-11-17 16:22:01
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