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chj787

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[ÇóÖú] matlabÄâºÏÇóÖú

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    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;

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¸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

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4Â¥2012-05-20 18:08:21
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

lijie169

Í­³æ (ÖøÃûдÊÖ)

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