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jjdg: ½ð±Ò+1, ¸Ðл²ÎÓë 2012-06-16 21:52:29
help polyfit
polyfit Fit polynomial to data.
    P = polyfit(X,Y,N) finds the coefficients of a polynomial P(X) of
    degree N that fits the data Y best in a least-squares sense. P is a
    row vector of length N+1 containing the polynomial coefficients in
    descending powers, P(1)*X^N + P(2)*X^(N-1) +...+ P(N)*X + P(N+1).

    [P,S] = polyfit(X,Y,N) returns the polynomial coefficients P and a
    structure S for use with POLYVAL to obtain error estimates for
    predictions.  S contains fields for the triangular factor (R) from a QR
    decomposition of the Vandermonde matrix of X, the degrees of freedom
    (df), and the norm of the residuals (normr).  If the data Y are random,
    an estimate of the covariance matrix of P is (Rinv*Rinv')*normr^2/df,
    where Rinv is the inverse of R.

    [P,S,MU] = polyfit(X,Y,N) finds the coefficients of a polynomial in
    XHAT = (X-MU(1))/MU(2) where MU(1) = MEAN(X) and MU(2) = STD(X). This
    centering and scaling transformation improves the numerical properties
    of both the polynomial and the fitting algorithm.

    Warning messages result if N is >= length(X), if X has repeated, or
    nearly repeated, points, or if X might need centering and scaling.
2Â¥2012-06-14 07:47:01
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jjdg: ½ð±Ò+1, ¸Ðл²ÎÓë 2012-06-16 21:52:37
ylberyl: ½ð±Ò+1, ¡ïÓаïÖú, ͨ¹ý»æÍ¼£¬Ö±½ÓÓÃoriginÁË¡£ 2012-06-19 12:01:16
ʹÓÃcftool£¨Curve Fitting Tool£©ÃüÁî¿ÉÒÔ¶ÔÊý¾Ý½øÐÐÄâºÏ£¬Ïà¹ØÏµÊý¡¢Îó²îÏîÆ½·½ºÍ±ê×¼Îó²î¾ù¿É×Ô¶¯Éú³É
3Â¥2012-06-16 10:29:06
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sujie1988

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