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chj787

½ð³æ (СÓÐÃûÆø)

[ÇóÖú] matlabÄâºÏÇóÖú

ÓÃmatlabÄâºÏÒ»¸ö·½³Ì£º
    y=(a+bx+cx^2+dx^3)exp(-bx)
x=[0.8,0.85,0.9,0.94,1,1.1,1.14,1.144,1.146,1.148,1.149,1.15,1.151,1.152,1.153,1.157,1.25,1.3,1.35,1.4,1.45,1.5,1.55,1.6,1.65,1.7,1.75,1.8,1.85,1.9,1.95,2,2.05,2.1,2.15,2.2,2.25,2.3,2.35,2.4];
y=[129698.6607,81517.14907,48462.38869,30160.54842,12625.39888,830.7904906,0,2.343989057,8.695584894,18.42928479,24.54823752,31.4946096,39.26181681,47.84108015,57.22581538,102.7141275,687.9234793,3872.493796,7589.20011,11578.99871,15654.88623,19681.73873,23751.25051,27388.0944,30756.13673,33816.1486,36542.19252,38921.37873,40955.22819,42660.53072,44067.23581,45213.10408,46138.07991,46880.36067,47474.18002,47948.97387,48329.25318,48634.92208,48881.88591,49082.65691];

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[ Last edited by chj787 on 2012-5-20 at 16:29 ]
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chj787

½ð³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by cactus586 at 2012-05-20 16:40:48:
×òÌì¿´µ½Ò»¸öÓÃMatLabÑÝ×࿨ٯµÄ ¿ÉÒÔÕ¾¶ÌÎÊÎÊËû
http://muchong.com/bbs/viewthread.php?tid=4519096

лл£¡
3Â¥2012-05-20 17:59:36
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 12 ¸ö»Ø´ð

cactus586

½ð³æ (ÖøÃûдÊÖ)

Á÷À˹ýµÄÈË×ÜÊÇÏëÔÙ´Î̤ÉÏÂÃ;

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
xzhdty: ½ð±Ò+1, »¶Ó­³£À´³ÌÐòÓïÑÔ¿´¿´ 2012-05-21 05:57:43
chj787: ½ð±Ò+30, ¡ïÓаïÖú, 1 2012-05-24 21:55:56
×òÌì¿´µ½Ò»¸öÓÃMatLabÑÝ×࿨ٯµÄ ¿ÉÒÔÕ¾¶ÌÎÊÎÊËû
http://muchong.com/bbs/viewthread.php?tid=4519096
¾²Ë®Á÷Éî
2Â¥2012-05-20 16:40:48
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijie169

Í­³æ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
xzhdty: ½ð±Ò+2, »¶Ó­³£À´³ÌÐòÓïÑÔ 2012-05-21 05:58:00
chj787: ½ð±Ò+3, ¡ï¡ï¡ïºÜÓаïÖú 2012-05-29 15:30:03
CODE:
function f=fit(x,y)
f=lsqnonlin(@(a)fun(a,x,y),[1,1,1,1]');
function f1=fun(a,x,y)
f1=y-(a(1)+a(2)*x+a(3)*x.^2+a(4)*x.^3).*exp(-a(2)*x);
end
end

x,y¾ÍÊÇÂ¥Ö÷ÊäÈëµÄ,aÊÇÒ»¸ö¾ØÕ󣬶ÔÓ¦×Åabcd
4Â¥2012-05-20 18:08:21
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijie169

Í­³æ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¶î£¬ÊäÈëfit(x,y)¾Í¿ÉÒÔÁË
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