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function F=myfun(x,xdata)
F=0.6518 + .7713./atan(xdata) - .0911.*atan(xdata) + ((.9121.* xdata + 1.572)/(.9121.* xdata + 1.59 + 2.3026./ xdata + 0.0637*log(1 + 15.7./ xdata)) - 1)/((1 + 5.04*x.* xdata)*(1 + (x^0.674).* (xdata.^0.173)));
end
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>> load data.txt
>> xdata=data(:,1);
>> ydata=data(:,2);
>> x=lsqcurvefit(@myfun,0.05,xdata,ydata)
??? Error using ==> mtimes
Inner matrix dimensions must agree.

Error in ==> myfun at 4
F=0.6518 + .7713./atan(xdata) - .0911.*atan(xdata) + ((.9121.* xdata + 1.572)/(.9121.* xdata + 1.59 + 2.3026./ xdata + 0.0637*log(1 + 15.7./ xdata)) - 1)/((1 + 5.04*x.* xdata)*(1
+ (x^0.674).* (xdata
Error in ==> lsqncommon at 152
            fuser = funfcn{3}(xargin{:},varargin{:});

Error in ==> lsqcurvefit at 186
[x,Resnorm,FVAL,EXITFLAG,OUTPUT,LAMBDA,JACOB] = ...

Caused by:
    Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue.
ÄѵÀlsqcurvefitµÄÃüÁîÖÐÊéдҲÓдíÎó£¿Çë´óÏÀÖ¸µã£¬¸Ð¼¤ÌéÁ㣡
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persistent06

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¡¾´ð°¸¡¿Ó¦Öú»ØÌû

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4Â¥2011-12-24 17:43:29
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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renchong

Òø³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÏëÁËһϠLZµÄxdataºÍydataÔÚ³ÌÐòÖÐû¼ûµ½ÓоßÌåµÄÖµ°¡£¬»¹ÓÐLZµÄµã³ËÓÐÎÊÌ⣬Çë²Î¿¼Ò»ÏÂÕâ¸ö°É£¨ÎÒÊÇÔÚÌí¼ÓÁËxdataºÍydataÖµºó×öµÄ£©ÄÜËã³ö½á¹û F=0.6518 + 0.7713./atan(xdata) - 0.0911*atan(xdata) + ((0.9121* xdata + 1.572)./(0.9121* xdata + 1.59 + 2.3026./ xdata + 0.0637*log(1 + 15.7./ xdata)) - 1)./((1 + 5.04*x* xdata).*(1 + (x^0.674)* (xdata.^0.173)));

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

3Â¥2011-12-24 17:10:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

beina

гæ (ÕýʽдÊÖ)

ËÍÏÊ»¨Ò»¶ä
ÒýÓûØÌû:
Â¥: Originally posted by renchong at 2011-12-24 17:10:54:
ÏëÁËһϠLZµÄxdataºÍydataÔÚ³ÌÐòÖÐû¼ûµ½ÓоßÌåµÄÖµ°¡£¬»¹ÓÐLZµÄµã³ËÓÐÎÊÌ⣬Çë²Î¿¼Ò»ÏÂÕâ¸ö°É£¨ÎÒÊÇÔÚÌí¼ÓÁËxdataºÍydataÖµºó×öµÄ£©ÄÜËã³ö½á¹û F=0.6518 + 0.7713./atan(xdata) - 0.0911*atan(xdata) + ((0.912 ...

°´ÕÕÄãµÄд·¨¹ûÈ»¶ÔÁË£¬µ«ÊÇÓÖÓдíÎóÁË£¬ÎØÎØ
??? Error using ==> qr
Complex sparse QR is not yet available.

Error in ==> aprecon at 57
   RPCMTX = qr(TM(:,p));

Error in ==> trdog at 47
         [R,permR] = feval(pcmtx,H,pcoptions,DM,DG,varargin{:});

Error in ==> snls at 346
      [sx,snod,qp,posdef,pcgit,Z] = trdog(x,g,A,D,delta,dv,...

Error in ==> lsqncommon at 285
    [x,FVAL,LAMBDA,JACOB,EXITFLAG,OUTPUT,msg]=...

Error in ==> lsqcurvefit at 186
[x,Resnorm,FVAL,EXITFLAG,OUTPUT,LAMBDA,JACOB] = ...
xdata ydataÓиötxtÎļþµÄÖµ£¬Ã»ÓÐдÉÏÈ¥
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5Â¥2011-12-25 09:51:01
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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