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3.98*a+59.74*b+1/9*c+9d=67.81
21.76*a+46.39*b+3/7*c+7/3*d=81.19
51.25*a+28.84*b+c+d=93.49
75.31*a+14.43*b+7/3*c+3/7*d=86.71
93.25*a+6.68*b+9*c+1/9*d=97.45

·½³Ì×é2
3.98*a+59.74*b+1/9*c=67.81
21.76*a+46.39*b+3/7*c=81.19
51.25*a+28.84*b+c=93.49
75.31*a+14.43*b+7/3*c=86.71
93.25*a+6.68*b+9*c=97.45

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1/9*a+9b=4.09
3/7*a+7/3*b=13.04
a+b=13.4
7/3*a+3/7*b= -3.03
9*a+1/9*b=-2.48
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swenson(½ð±Ò+30): 2010-05-25 18:43:50
Doctorcbw:Âé·³»Ø´ðÇóÖúÈ˵ÄÎÊÌâ лл 2010-05-25 23:49:47
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Originally posted by swenson at 2010-05-25 14:08:56:

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swenson(½ð±Ò+19):лл 2010-05-26 21:03:50
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Originally posted by swenson at 2010-05-26 12:03:09:

A=[3.98,59.74,1/9,9;21.76,46.39,3/7,7/3;51.25,28.84,1,1;75.31,14.43,7/3,3/7;93.25,6.68,9,1/9];
b=[67.81;81.19;93.49;86.71;97.45];
%f = fittype('A*[a;b;c;d]=b');
%[c2,gof2] = fit(A,b,f)
A1=A'* ...

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REGRESS Multiple linear regression using least squares.
    b = REGRESS(y,X) returns the vector of regression coefficients, b,
    in the linear model  y = Xb, (X is an nxp matrix, y is the nx1
    vector of observations).

    [B,BINT,R,RINT,STATS] = REGRESS(y,X,alpha) uses the input, ALPHA
    to calculate 100(1 - ALPHA) confidence intervals for B and the
    residual vector, R, in BINT and RINT respectively.  The vector
    STATS contains the R-square statistic along with the F and p
    values for the regression.

    The X matrix should include a column of ones so that the model
    contains a constant term.  The F and p values are computed under
    the assumption that the model contains a constant term, and they
    are not correct for models without a constant.  The R-square
    value is the ratio of the regression sum of squares to the
    total sum of squares.

ÄãµÄÄ£ÐÍÀïûÓг£ÊýÏËùÒÔÖ»ÄÜËã[B,BINT].ÎÒ¸ÄÁ˱äÁ¿Ãû£¬ÒÔ¶ÔÓ¦º¯Êý˵Ã÷¡£¹ý³ÌÈçÏ£º
X=[3.98,59.74,1/9,9;21.76,46.39,3/7,7/3;51.25,28.84,1,1;75.31,14.43,7/3,3/7;93.25,6.68,9,1/9];
y=[67.81;81.19;93.49;86.71;97.45];
[b,bint] = regress(y,X,0.05);
µÃµ½µÄbÊÇ×îС¶þ³Ë½â£¬¶øbintÊÇÖÃÐŶÈΪ95%£¨¿ÉÒÔ×ÔÐе÷Õû£©µÄÖÃÐÅÇø¼ä£¬¿´ÁËÊä³öµÄÊý¾ÝÄã¾Í»áÖªµÀÕâ¸öÖÃÐÅÇø¼äÌ«´ó£¬Ã»Ê²Ã´ÒâÒ壬ÎÒÏëÕâÊÇÒòΪÊý¾ÝÌ«ÉÙµÄÔµ¹Ê¡£Èç¹û·ÇÒª±ÈµÄ»°£¬¿ÉÒÔ¼ÆËãÏàͬÖÃÐŶÈϵÄÖÃÐÅÇø¼äµÄ´óС£¬±ÈÈç
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x = [0.4; 0.8; 1.0; 1.2; 1.6; 2.0; 2.4; 2.8];

y = [0.354478; 0.51534; 0.629768; 0.685323; 0.830431; 0.915008; 1.001244; 1.07 ...

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[ Last edited by saladin983 on 2010-5-30 at 16:46 ]
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