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cupidaxun: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ·Ç³£¸Ðл£¡ 2013-06-10 12:30:17
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Parameters x;
Function (1-x)*(2-x)*(3-x)=4;
½á
µü´úÊý: 16
¼ÆËãÓÃʱ(ʱ:·Ö:Ãë:ºÁÃë): 00:00:00:61
¼ÆËãÖÐÖ¹Ô­Òò: ´ïµ½ÊÕÁ²Åж¨±ê×¼
ÓÅ»¯Ëã·¨: Âó¿äÌØ·¨(Levenberg-Marquardt) + ͨÓÃÈ«¾ÖÓÅ»¯·¨
º¯Êý±í´ïʽ (1-x)*(2-x)*(3-x)-(4)
Ä¿±êº¯ÊýÖµ: 0
x: 0.203678096741042

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function solvenole
clear all;clc
format long
global a b c A

a=input('ÇëÊäÈëÒÑÖª³£Êýa=');
b=input('ÇëÊäÈëÒÑÖª³£Êýb=');
c=input('ÇëÊäÈëÒÑÖª³£Êýc=');
A=input('ÇëÊäÈëÒÑÖª³£ÊýA=');


x1=fsolve(@fun299792,[a])


%--------------------------------
function y=fun299792(x)
global a b c A
y=(a-x)*(b-x)*(c-x)-A;

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2Â¥2013-06-10 10:07:13
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cupidaxun

ľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by ÔÂÖ»À¶ at 2013-06-10 10:07:13
1stopt¡¢MATLAB¡¢Maple£¬EXCEL¶¼¿ÉÒÔ×ö¡£

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Parameters x;
Function (1-x)*(2-x)*(3-x)=4;
½á
µü´úÊý: 16
¼ÆËãÓÃʱ(ʱ:·Ö:Ãë:ºÁÃë): 00:00:00:61
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3Â¥2013-06-10 12:33:15
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dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

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csgt0: ½ð±Ò+2, лл 2013-06-14 10:42:06
ÒýÓûØÌû:
3Â¥: Originally posted by cupidaxun at 2013-06-10 12:33:15
·Ç³£¸ÐлÌṩµÄ¹¤¾ßºÍ·½·¨£¬Ö»ÊÇÕâЩ¹¤¾ß¶¼Ã»ÓÐÓùý£¬stoptÕýÔÚÑо¿ÖУ¬ÇëÎÊÓÃExcel¼ÆËãÄÜ·ñʵÏÖ£¿£¨±ÈÈ磬ÎÒÁÐ±í¸ø³öa,b,c,AÊý¾Ý£¬¶ÔÓ¦µÄx£¬¾Í¿ÉÒÔÔÚÁíÒ»ÁмÆËã³öÀ´£©...

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x=solve('(a-x)*(b-x)*(c-x)=A','x')

x =

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           a/3 + b/3 + c/3 - ((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)/((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3) + ((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3)

a/3 + b/3 + c/3 + ((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)/(2*((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3)) - ((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3)/2 - (3^(1/2)*(((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)/((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3) + ((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3))*i)/2

a/3 + b/3 + c/3 + ((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)/(2*((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3)) - ((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3)/2 + (3^(1/2)*(((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)/((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3) + ((((a*b)/3 + (a*c)/3 + (b*c)/3 - (a + b + c)^2/9)^3 + (A/2 + ((a + b + c)*(a*b + a*c + b*c))/6 - (a + b + c)^3/27 - (a*b*c)/2)^2)^(1/2) - A/2 - ((a + b + c)*(a*b + a*c + b*c))/6 + (a + b + c)^3/27 + (a*b*c)/2)^(1/3))*i)/2
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.
4Â¥2013-06-10 18:02:47
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pippi6

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csgt0: ½ð±Ò+1, »¶Ó­½»Á÷ 2013-06-14 10:42:19
ÒýÓûØÌû:
4Â¥: Originally posted by dbb627 at 2013-06-10 18:02:47
¿ÉÒÔ£¬Áиö¹«Ê½¾Í¿ÉÒÔ
xһʵ¸ù£¬2Ðé¸ù
x=solve('(a-x)*(b-x)*(c-x)=A','x')

x =

                                                                                                             ...

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  • ¸½¼þ 1 : CubicEqaution.xls
  • 2013-06-11 09:23:36, 14.5 K

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5Â¥2013-06-11 09:24:04
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cupidaxun

ľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
4Â¥: Originally posted by dbb627 at 2013-06-10 18:02:47
¿ÉÒÔ£¬Áиö¹«Ê½¾Í¿ÉÒÔ
xһʵ¸ù£¬2Ðé¸ù
x=solve('(a-x)*(b-x)*(c-x)=A','x')

x =

                                                                                                             ...

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6Â¥2013-06-11 10:26:58
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cupidaxun

ľ³æ (ÖøÃûдÊÖ)

Ëͺ컨һ¶ä
ÒýÓûØÌû:
5Â¥: Originally posted by pippi6 at 2013-06-11 09:24:04
¶Ô¡°Ò»Êµ¸ù£¬2Ðé¸ù¡±Ëµ·¨ÓÐÒìÒé¡£ÕâÍêȫȡ¾öÓÚa£¬b£¬c£¬A¡£Èç¹ûa£¬b£¬c£¬A¶¼ÊÇʵÊý£¬±ØÈ»ÓÐÒ»¸öʵÊý½â£¬ÆäËûÁ½¸öÔò²»Ò»¶¨¡£a£¬b£¬c¸´Êý£¬ A=0£¬ÔòÊÇÈý¸ö¸´Êý½â¡£A=0£¬a£¬b£¬cÊÇʵÊý£¬¾ÍÓÐÈý¸öʵÊý½â¡£ÔÙÕߣ¬ÕâÑùÈß ...

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7Â¥2013-06-11 11:49:17
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pippi6

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ÒýÓûØÌû:
7Â¥: Originally posted by cupidaxun at 2013-06-11 11:49:17
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dx=-f(x)/f'(x)
x=x+dx
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8Â¥2013-06-11 12:03:59
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dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
8Â¥: Originally posted by pippi6 at 2013-06-11 12:03:59
Èç¹ûÊÇ×ö¹¤³Ì£¬ÄǾÍûÉÌÁ¿£¬Ê¹ÓÃNewton·¨¡£Ö»´ËÒ»ÕУ¬·ÇÏßÐÔͨ³Ô¡£ ÌØ±ðÊʺÏÄãÕâÖÖÓе¼Êý½âÎö±í´ïµÄÇé¿ö¡£Ëùν½âÎö½â¡¢mapleÖ®Àà¶¼ÊÇÍæÍæµÄ£¬Êµ¼ÊÖÐûɶÒâ˼¡£Newton·¨¼òµ¥±í´ï¾ÍÊÇ
dx=-f(x)/f'(x)
x=x+dx
·Ç³£ ...

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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.
9Â¥2013-06-13 10:54:59
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Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ cupidaxun µÄÖ÷Ìâ¸üÐÂ
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