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myw052

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±¾ÈËÐèÒª¶ÔÏÂÃæµÄÊý¾Ý½øÐÐÄâºÏ£¬ÄâºÏº¯ÊýΪx=B1+B2*lg(y-B3),ÆäÖÐlg±íʾÒÔ10Ϊµ×µÄlogº¯Êý¡£ÐèÒªÄâºÏ³öB1,B2,B3µÄÊýÖµ¡£

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3.004  640.19
3.297  591.08
3.345  583.34
3.465  564.69
3.585  546.54
3.769  519.82
3.959  493.58
4.018  485.67
4.278  452.43
4.475  400.28
4.802  379.72
5.036  367.44
5.151  368.26
5.282  367.44
5.315  341.13
5.386  356.70
5.398  369.09
5.729  356.70
5.866  356.70
6.296  359.17
6.302  343.58
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dbb627

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>> A=[3.004  640.19
3.297  591.08
3.345  583.34
3.465  564.69
3.585  546.54
3.769  519.82
3.959  493.58
4.018  485.67
4.278  452.43
4.475  400.28
4.802  379.72
5.036  367.44
5.151  368.26
5.282  367.44
5.315  341.13
5.386  356.70
5.398  369.09
5.729  356.70
5.866  356.70
6.296  359.17
6.302  343.58];
x=A(:,1);y=A(:,2);
st_ = [2 2 3] ;
ft_ = fittype('B1+B2*log10(y-B3)','dependent',{'x'},'independent',{'y'},'coefficients',{'B1', 'B2','B3'});
[cf_,good]= fit(y,x,ft_ ,'Startpoint',st_)
h_ = plot(cf_,'fit',0.95);
legend off;  % turn off legend from plot method call
set(h_(1),'Color',[1 0 0],...
     'LineStyle','-', 'LineWidth',2,...
     'Marker','none', 'MarkerSize',6);
hold on,plot(y,x,'*')

cf_ =

     General model:
     cf_(y) = B1+B2*log10(y-B3)
     Coefficients (with 95% confidence bounds):
       B1 =       11.65  (5.446, 17.86)
       B2 =      -3.371  (-5.779, -0.9636)
       B3 =       292.6  (210.3, 375)

good =

           sse: 1.7251
       rsquare: 0.9180
           dfe: 18
    adjrsquare: 0.9089
          rmse: 0.3096
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2012-04-15 11:46:46
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

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myw052: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ÍêÈ«ÕýÈ·£¬¶àл°æÖ÷¡£ 2012-04-15 13:34:33
myw052: »ØÌûÖö¥ 2012-04-15 13:34:39
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The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
3Â¥2012-04-15 11:49:24
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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