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daicong

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wangww2011

ľ³æ (ÖøÃûдÊÖ)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
ÒýÓûØÌû:
27Â¥: Originally posted by daicong at 2012-07-13 00:03:19
ĿǰÎÒÖ»×öÏßÐÔ·½³Ì£¬±ÈÈ磺
A*x=b,·½³Ì×éÓþØÕó±íʾ¡£A,bΪÒÑÖªÁ¿£¬xÊÇÐèÒªÇóµÄ¡£
ÀýÈç(¾ÙÒ»¸öÀý×Ó)£º
5*x1+3*x2-4*x3=5;
6*x1+3*x2-2*x3=3;
13*x1+2*x2-9*x3=13;
76*x1+43*x2-24*x3=32;
24*x1+43*x2-23*x ...

ÄãÕâ¸öÎÊÌâ²»ÐèҪʲôËã·¨£¬Æäʵ¾ÍÊÇ×éºÏߣ¬matlabÀïÓиöº¯Êýcombnk
http://www.mathworks.co.uk/help/toolbox/stats/combnk.html
È»ºóºÃÏñÄãµÄÎÊÌâ¾ÍÄܽâ¾öÁË
31Â¥2012-07-13 23:23:44
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zhdgzhdg

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
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33Â¥2012-07-14 20:06:13
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ÒýÓûØÌû:
27Â¥: Originally posted by daicong at 2012-07-13 00:03:19
ĿǰÎÒÖ»×öÏßÐÔ·½³Ì£¬±ÈÈ磺
A*x=b,·½³Ì×éÓþØÕó±íʾ¡£A,bΪÒÑÖªÁ¿£¬xÊÇÐèÒªÇóµÄ¡£
ÀýÈç(¾ÙÒ»¸öÀý×Ó)£º
5*x1+3*x2-4*x3=5;
6*x1+3*x2-2*x3=3;
13*x1+2*x2-9*x3=13;
76*x1+43*x2-24*x3=32;
24*x1+43*x2-23*x ...

´ó¸ç°¡£¬×î¼òµ¥µÄ·½·¨Äã¿ÉÒÔ¸øÃ¿¸ö·½³ÌÒ»¸öÐòºÅ£¬È»ºó´ÓÕâЩÐòºÅÖÐËæ»úÑ¡¾Í¿ÉÒÔÁË¡£¸ü·½±ãµãµÄ£¬Äã¹¹³ÉÒ»¸öm*n+1µÄ¾ØÕ󣬴ӯäÖеÄmÐÐÖÐÈÎÑ¡kÐнøÐÐÐÐÁÐʽ¼ÆËã¾Í¿ÉÒÔÁË¡£
37Â¥2012-07-16 13:52:20
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daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
31Â¥: Originally posted by wangww2011 at 2012-07-13 03:23:44
ÄãÕâ¸öÎÊÌâ²»ÐèҪʲôËã·¨£¬Æäʵ¾ÍÊÇ×éºÏߣ¬matlabÀïÓиöº¯Êýcombnk
http://www.mathworks.co.uk/help/toolbox/stats/combnk.html
È»ºóºÃÏñÄãµÄÎÊÌâ¾ÍÄܽâ¾öÁË...

Õâ¸öº¯Êýȷʵ¶ÔÎÒºÜÓаïÖú£¬²»¹ý¼´Ê¹ÕâÑù¶ÔÕû¸ö³ÌÐòÀ´Ëµ»¹ÐèÒªºÜ¸´ÔӵĹý³Ì¡£
38Â¥2012-07-17 01:28:37
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wangww2011

ľ³æ (ÖøÃûдÊÖ)


¡ï ¡ï ¡ï
daicong: ½ð±Ò+3 2012-07-17 22:24:38
ÒýÓûØÌû:
38Â¥: Originally posted by daicong at 2012-07-17 01:28:37
Õâ¸öº¯Êýȷʵ¶ÔÎÒºÜÓаïÖú£¬²»¹ý¼´Ê¹ÕâÑù¶ÔÕû¸ö³ÌÐòÀ´Ëµ»¹ÐèÒªºÜ¸´ÔӵĹý³Ì¡£...

È̲»×¡¸øÄãдÁË
CODE:
A=[5 3 -4;
    6 3 -2;
    13 2 -9;
    76 43 -24;
    24 43 -23];

b=[5;3;13;32;43];


indices=combnk(1:5,3);

for i=1:length(indices)
    index=indices(i,:);
    B=A(index,:)
    if abs(det(B))>1e-12
        res=B\b(index)
    else
        det(B)
    end
   
end

40Â¥2012-07-17 07:17:42
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
40Â¥: Originally posted by wangww2011 at 2012-07-16 11:17:42
È̲»×¡¸øÄãдÁË

A=;

b=;


indices=combnk(1:5,3);

for i=1:length(indices)
    index=indices(i,;
    B=A(index,
    if abs(det(B))>1e-12
        res=B\b(index)
    else
        ...

ллÄãдµÄ´úÂë¡£µ«ÎÒÔËÐÐÖ®ºó·¢ÏÖ½á¹ûÓëÎÒÏëÏóµÄ²»Ò»Ñù£º°´µÀÀíÿÈý¸ö·½³ÌÁªºÏÇó½â¿ÉÒԵõ½Ò»¸ö½â£¬ÄÇôÕâÎå¸ö·½³Ì¾ÍÓ¦¸ÃÓÐÊ®¸ö£¬µ±È»Ò²ÓпÉÄÜÓеÄÈý¸ö·½³ÌûÓн⣻µ«ÔËÐÐÖ®ºóµÄ½á¹ûÖ»ÓÐÒ»¸ö½â¡£ÇëÎÊÕâ¸öÊÇ·ñÓÐÎÊÌâÄØ£¿
41Â¥2012-07-17 22:24:26
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wangww2011

ľ³æ (ÖøÃûдÊÖ)


¡ï ¡ï ¡ï ¡ï ¡ï
daicong: ½ð±Ò+5 2012-07-18 02:11:51
ÒýÓûØÌû:
41Â¥: Originally posted by daicong at 2012-07-17 22:24:26
ллÄãдµÄ´úÂë¡£µ«ÎÒÔËÐÐÖ®ºó·¢ÏÖ½á¹ûÓëÎÒÏëÏóµÄ²»Ò»Ñù£º°´µÀÀíÿÈý¸ö·½³ÌÁªºÏÇó½â¿ÉÒԵõ½Ò»¸ö½â£¬ÄÇôÕâÎå¸ö·½³Ì¾ÍÓ¦¸ÃÓÐÊ®¸ö£¬µ±È»Ò²ÓпÉÄÜÓеÄÈý¸ö·½³ÌûÓн⣻µ«ÔËÐÐÖ®ºóµÄ½á¹ûÖ»ÓÐÒ»¸ö½â¡£ÇëÎÊÕâ¸öÊÇ·ñÓÐÎÊ ...

¶î ²»»á°É Ã÷Ã÷ÓÐ10¸ö½âµÄ°¡ ÖÁÉÙÔÚÎÒµçÄÔÉϾÍÊÇ10¸ö½â°¡ matlab²»¿ÉÄܸøÓû§Ìṩ²»Ò»ÑùµÄÓû§ÌåÑé°¡
42Â¥2012-07-17 23:22:13
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daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
42Â¥: Originally posted by wangww2011 at 2012-07-17 03:22:13
¶î ²»»á°É Ã÷Ã÷ÓÐ10¸ö½âµÄ°¡ ÖÁÉÙÔÚÎÒµçÄÔÉϾÍÊÇ10¸ö½â°¡ matlab²»¿ÉÄܸøÓû§Ìṩ²»Ò»ÑùµÄÓû§ÌåÑé°¡...

ÊÇÓÐÊ®¸ö£¬²»ºÃÒâ˼£¬ÎÒ¸ø¼ÓÉÏ·ÖºÅÁË¡£
Óû§ÌåÑéÒ»Ñù£¬ºÇºÇ¡£
43Â¥2012-07-18 02:11:41
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


Çó¸øÁ¦£¬Ð»Ð»¡£
5Â¥2012-07-11 08:47:01
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
¡ï
daicong(½ð±Ò+1): лл²ÎÓë
¾ÍÊǽⷽ³Ì×é°¡£¬¿Ï¶¨¿ÉÒÔ£¬µ«ÊÇÓеIJ»Ò»¶¨ÄÜÇó³ö½âÎö½â¡£
10Â¥2012-07-11 09:37:49
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
10Â¥: Originally posted by csgt0 at 2012-07-10 13:37:49
¾ÍÊǽⷽ³Ì×é°¡£¬¿Ï¶¨¿ÉÒÔ£¬µ«ÊÇÓеIJ»Ò»¶¨ÄÜÇó³ö½âÎö½â¡£

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ÎÒÖ»ÒªÊäÈë·½³Ì¼´¿É¡£
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11Â¥2012-07-11 11:28:42
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daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
10Â¥: Originally posted by csgt0 at 2012-07-10 13:37:49
¾ÍÊǽⷽ³Ì×é°¡£¬¿Ï¶¨¿ÉÒÔ£¬µ«ÊÇÓеIJ»Ò»¶¨ÄÜÇó³ö½âÎö½â¡£

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12Â¥2012-07-11 11:30:00
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
ÒýÓûØÌû:
11Â¥: Originally posted by daicong at 2012-07-11 11:28:42
µ±È»Êǽⷽ³Ì£¬ÎÊÌâÊÇÈçºÎͨ¹ý±à³Ì×Ô¶¯½â¾ö¡£
ÎÒÖ»ÒªÊäÈë·½³Ì¼´¿É¡£
È»ºó¸ø³öһϵÁеĿÉÐн⡣...

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13Â¥2012-07-11 11:43:45
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

baobiao007

ľ³æ (Ö°Òµ×÷¼Ò)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
ÕâÊôÓÚijÖÖ·´ÑÝÎÊÌâÁË£¬ÊôÓÚרÃŵÄÑо¿¿ÎÌâÁË¡£²»ÊÇÈýÏÂÎå³ý¶þÄܸ㶨µÄ¡£
18Â¥2012-07-11 19:25:03
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hhlxg

½ð³æ (СÓÐÃûÆø)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
Çó½âÓÐÏÞ¸öµÄ·½³Ì×ö¹ý£¬ÏñÄãÃèÊöµÄÕâ¸öÓÐÄѶȣ¬¹Ø¼üÊdzÌÐòÄÜ×Ô¼ºÊ¶±ðµÄÓÐÏÞ¡£
19Â¥2012-07-11 20:08:05
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
19Â¥: Originally posted by hhlxg at 2012-07-11 00:08:05
Çó½âÓÐÏÞ¸öµÄ·½³Ì×ö¹ý£¬ÏñÄãÃèÊöµÄÕâ¸öÓÐÄѶȣ¬¹Ø¼üÊdzÌÐòÄÜ×Ô¼ºÊ¶±ðµÄÓÐÏÞ¡£

ĿǰÎÒÖ»×öÏßÐÔ·½³Ì£¬±ÈÈ磺
A*x=b,·½³Ì×éÓþØÕó±íʾ¡£A,bΪÒÑÖªÁ¿£¬xÊÇÐèÒªÇóµÄ¡£
ÀýÈç(¾ÙÒ»¸öÀý×Ó)£º
5*x1+3*x2-4*x3=5;
6*x1+3*x2-2*x3=3;
13*x1+2*x2-9*x3=13;
76*x1+43*x2-24*x3=32;
24*x1+43*x2-23*x3=43;
´ÓÕâÎå¸ö·½³ÌÖÐÈÎÒâÑ¡³öÈý¸ö·½³ÌÔò¿ÉÄÜÇóµÃÒ»×é½â¡£
ÎÒÏÖÔÚ¶ÔÕâÑùµÄ±à³Ì»¹Ã»ÓкܺõÄËã·¨¡£
20Â¥2012-07-11 22:44:03
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
18Â¥: Originally posted by baobiao007 at 2012-07-10 23:25:03
ÕâÊôÓÚijÖÖ·´ÑÝÎÊÌâÁË£¬ÊôÓÚרÃŵÄÑо¿¿ÎÌâÁË¡£²»ÊÇÈýÏÂÎå³ý¶þÄܸ㶨µÄ¡£

Ŀǰ¿ÉÒÔ¶Áȡȫ²¿µÄ·½³Ì£¬µ«ÎÊÌâÊDz»ÖªµÀÈçºÎÖÇÄܵÄÑ¡Ôñn¸ö·½³ÌÇó½â¡£²¢ÇÒ»¹ÒªÄÜÅжÏÊÇ·ñ´æÔڽ⣬ÒòΪ²»ÊÇÿn¸ö·½³Ì×é¶¼ÓпÉÐнâµÄ¡£
22Â¥2012-07-11 23:02:43
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

huiquan0918

¾èÖú¹ó±ö (Ö°Òµ×÷¼Ò)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
¿´ÃÉȦÁË¡­¡­
23Â¥2012-07-11 23:11:39
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

hhlxg

½ð³æ (СÓÐÃûÆø)


¡ï
dbb627: ½ð±Ò+1, ¸ÐлӦÖú 2012-07-12 09:57:19
ÒýÓûØÌû:
20Â¥: Originally posted by daicong at 2012-07-11 22:44:03
ĿǰÎÒÖ»×öÏßÐÔ·½³Ì£¬±ÈÈ磺
A*x=b,·½³Ì×éÓþØÕó±íʾ¡£A,bΪÒÑÖªÁ¿£¬xÊÇÐèÒªÇóµÄ¡£
ÀýÈç(¾ÙÒ»¸öÀý×Ó)£º
5*x1+3*x2-4*x3=5;
6*x1+3*x2-2*x3=3;
13*x1+2*x2-9*x3=13;
76*x1+43*x2-24*x3=32;
24*x1+43*x2-23*x ...

Èç¹ûÊÇÄãÃèÊöµÄÊÇÏßÐÔ·½³Ì×éµÄ»°
ÓþØÕóÇó½â¾Í¿ÉÒÔÁË
A*x=b
x=[A]'b
[A]'Ϊ¾ØÕóAµÄÄæ¾ØÕó
[5 3 -4;6 6 -2;13 2 -9]x=[5;3;13]
>> A=[5 3 -4;6 6 -2;13 2 -9]

A =

     5     3    -4
     6     6    -2
    13     2    -9

>> b=[5;3;13]

b =

     5
     3
    13

>> x=A^-1*b

x =

    0.4184
   -0.2143
   -0.8878
24Â¥2012-07-12 06:43:03
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
24Â¥: Originally posted by hhlxg at 2012-07-11 10:43:03
Èç¹ûÊÇÄãÃèÊöµÄÊÇÏßÐÔ·½³Ì×éµÄ»°
ÓþØÕóÇó½â¾Í¿ÉÒÔÁË
A*x=b
x='b
'Ϊ¾ØÕóAµÄÄæ¾ØÕó
x=
>> A=

A =

     5     3    -4
     6     6    -2
    13     2    -9

>> b=

b =

      ...

ÎÒÖªµÀÕâÑù½â£¬µ«ÊÇÕâÖ»Äܸø³öÒ»×é½â¡£Ò²ÐíÄ㻹ûÓÐÃ÷°×ÎÒµÄÒâͼ£¬ÎÒÊǼÙÉèÓÐm¸önÔª·½³Ì£¬È»ºóÓɳÌÐòËã³ö¿ÉÄܵÄËùÓн⡣²»ÊÇ×Ô¼ºÒ»¸öÒ»¸öÈ¥ÊÔ¡£ÐèÒªÖÇÄܵġ£
25Â¥2012-07-12 22:58:17
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wanghao9999

ľ³æ (ÖøÃûдÊÖ)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
Ó¦¸ÃÄܽâ³ö£¬µ«ÊÇÓеIJ»Ò»¶¨ÄÜÇó³ö½âÎö½â£¬ÄÜ·ñ¾ßÌåÃèÊöÏÂÎÊÌâ
26Â¥2012-07-12 23:51:58
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
26Â¥: Originally posted by wanghao9999 at 2012-07-12 03:51:58
Ó¦¸ÃÄܽâ³ö£¬µ«ÊÇÓеIJ»Ò»¶¨ÄÜÇó³ö½âÎö½â£¬ÄÜ·ñ¾ßÌåÃèÊöÏÂÎÊÌâ

ĿǰÎÒÖ»×öÏßÐÔ·½³Ì£¬±ÈÈ磺
A*x=b,·½³Ì×éÓþØÕó±íʾ¡£A,bΪÒÑÖªÁ¿£¬xÊÇÐèÒªÇóµÄ¡£
ÀýÈç(¾ÙÒ»¸öÀý×Ó)£º
5*x1+3*x2-4*x3=5;
6*x1+3*x2-2*x3=3;
13*x1+2*x2-9*x3=13;
76*x1+43*x2-24*x3=32;
24*x1+43*x2-23*x3=43;
´ÓÕâÎå¸ö·½³ÌÖÐÈÎÒâÑ¡³öÈý¸ö·½³ÌÔò¿ÉÄÜÇóµÃÒ»×é½â¡£
ÎÒÏÖÔÚ¶ÔÕâÑùµÄ±à³Ì»¹Ã»ÓкܺõÄËã·¨¡£
27Â¥2012-07-13 00:03:19
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

userhung

½û³æ (ÎÄѧ̩¶·)


¡ï
daicong(½ð±Ò+1): лл²ÎÓë
½â·½³Ì×éŶ~~~~~~~~~~~~~~~~~~~~`
28Â¥2012-07-13 05:53:04
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


ÒýÓûØÌû:
28Â¥: Originally posted by userhung at 2012-07-12 09:53:04
½â·½³Ì×éŶ~~~~~~~~~~~~~~~~~~~~`

Any idea?
29Â¥2012-07-13 07:06:13
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

daicong

ľ³æ (СÓÐÃûÆø)


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37Â¥: Originally posted by csgt0 at 2012-07-15 17:52:20
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42Â¥: Originally posted by wangww2011 at 2012-07-17 03:22:13
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