20Â¥: Originally posted by tmdxyz at 2011-12-01 17:18:37:
y=p1+p2/Ln(x)+p3/(Ln(x))^2+p4/(Ln(x))^3+p5/(Ln(x))^4+p6/(Ln(x))^5+p7/(Ln(x))

Function: y = p1+p2/Ln(x)+p3/(Ln(x))^2+p4/(Ln(x))^3+p5/(Ln(x))^4+p6/(Ln(x))^5+p7/(Ln(x))^6+p8/(Ln(x))^7+p9/(Ln(x))^8+ ...

11Â¥: Originally posted by dbb627 at 2011-11-28 16:55:58:
[code]
x = [0.768;
0.711;
0.685;
0.671;
0.659;
0.657;
0.655;
0.654;
0.653;
0.654];
y = [4.584;
4.375;
4.234;
4.128;
4.041;
3.972;
3.913;
3.861;
3.815;
3.774];
opts = fitoptions ...

23Â¥: Originally posted by guojunhang at 2011-12-03 17:41:42:
³ÌÐòÔËÐÐÍê±Ïºó
        a =       4.167
        b =      0.1139
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µ«ÊÇÖ´ÐÐЧ¹ûÏÔʾ£¬ºÜ²î£¬ËµÃ÷Õâ¸öÄâºÏ½á¹ûÑÏÖز»¿¿Æ×°¡¡£
ÆÚ´ý½âÊÍ¡£
ÆäʵÉÏÃæÒ²ÓÐ ...

a =  4.167; b = 0.1139;
x = [0.768;
0.711;
0.685;
0.671;
0.659;
0.657;
0.655;
0.654;
0.653;
0.654];
y = [4.584;
4.375;
4.234;
4.128;
4.041;
3.972;
3.913;
3.861;
3.815;
3.774];
figure;
plot(x,y,'k-')
x1=x-mean(x);
x1=x1/std(x1);
hold on;
y_fit = a+b*log10(1-b*x1)+(1-b)*log10(1-b*x1+x1);
plot(x,y_fit,'ro-')

24Â¥: Originally posted by dbb627 at 2011-12-03 20:10:35:
Õâ¸öxµÄÊý¾Ý×ö¹ý¹éÒ»»¯´¦ÀíºóÔٻعéµÄ
[code]
a =  4.167; b = 0.1139;
x = [0.768;
0.711;
0.685;
0.671;
0.659;
0.657;
0.655;
0.654;
0.653;
0.654];
y = [4.584;
4.375;
4.234;
4.128;
4. ...

25Â¥: Originally posted by guojunhang at 2011-12-03 21:39:31:
ÎÒ¶¶µ¨ÔÙÎÊÒ»¾ä£º
a = ? £¬  b =?

26Â¥: Originally posted by dbb627 at 2011-12-03 21:44:23:
a =  4.167; b = 0.1139;Õâ¸ö³ÌÐòÖв»ÊǸøÁËÂð£¬ÓÐʲô²»Çå³þµÄÂð