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815292578: ½ð±Ò+10, ¡ïÓаïÖú, ¸ÐлÄãµÄ»Ø¸´£¡ 2013-09-05 16:43:55
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±àдNewtonµü´ú·¨µÄMÎļþNewtonIterate.ÈçÏ£º
function s=NewtonIterate(x,eps)
%Newtonµü´ú·¨Çó·ÇÏßÐÔ·½³Ì×é
%xΪµü´ú³õÖµ£¬epsΪÔÊÐíÎó²îÖµ
if nargin==1
    eps=1.0e-6;
elseif nargin<1
    error
    return
end  
x1=fx1(x);%·ÇÏßÐÔ·½³Ì×é
x2=-dfx1(x);%·ÇÏßÐÔ·½³Ì×éµ¼Êý
x3=inv(x2);
x0=x3*x1';
while norm(x0)>=eps %Ñ­»·µü´ú
      x=x0'+x;
      x1=fx1(x);
      x2=-dfx1(x);
      x3=inv(x2);
      x0=x3*x1';
end
s=x0'+x;
return
Àý£º x1.^2-10x1+x2.^2+b=0
     x1*x2.^2+x1-10x2+8=0
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   function y=fx1(x)
   y(1)=x(1)*x(1)-10*x(1)+x(2)*x(2)+8;
   y(2)=x(1)*x(2)*x(2)+x(1)-10*x(2)+8;
   y=[y(1) y(2)];
±àд·ÇÏßÐÔ·½³Ì×éµ¼ÊýµÄMÎļþdfx1.m
  function y=dfx1(x)
     y(1)=2*x(1)-10;
     y(2)=2*x(2);
     y(3)=x(2)*x(2)+1;
     y(4)=2*x(1)*x(2)-10;
     y=[y(1) y(2);y(3) y(4)];
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3Â¥2013-09-05 11:34:17
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3Â¥: Originally posted by z65668396 at 2013-09-05 11:34:17
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function s=NewtonIterate(x,eps)
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%xΪµü´ú³õÖµ£¬epsΪÔÊÐí ...

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d/dr(dy/dr)=(2/A*sin(y)/cos^2(y)-B/cos^2(y)*1/r)dy/dr+sin(y)/cos(y)*B/r^2
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4Â¥2013-09-05 16:55:26
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z65668396

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ÒýÓûØÌû:
4Â¥: Originally posted by 815292578 at 2013-09-05 16:55:26
¸ÐлÄãµÄ»Ø¸´£¬±¾È˽ð±Ò²»¶à£¬ÇëÄã¼ûÁ¡£¶ÔÓÚÉÏÃæµÄ·ÇÏßÐÔ³£Î¢·Ö·½³ÌµÄÇó½âÄãÓÐûÓн¨Ò飿ÎÒ²éÔĹýһЩ×ÊÁÏ£¬ÏÖÔÚûÓÐÕÒµ½ºÏÊʵķ½·¨Çó½âËü£¬ÒòΪ½«Õâ¸ö·½³Ì»¯¼òºóÊÇ
d/dr(dy/dr)=(2/A*sin(y)/cos^2(y)-B/cos^2(y ...

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