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[ÇóÖú] matlabÅ£¶Ùµü´úµÄÎÊÌ⣬³öÏÖMatrix dimensions must agreµÄ´íÎó ÒÑÓÐ1È˲ÎÓë

ÔÚÓÃÓÃÅ£¶Ùµü´úÇó2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x)=0ÖеÄx ³õÖµÊÇ0.03
function [x,fval]=newton()
clc;
syms x;
f=@(x)2*log10(5.4*10^-4+2.51*10^-5/sqrt(x))+1/sqrt(x);
df=@(x)diff(2*log10(5.4*10^-4+2.51*10^-5/sqrt(x))+1/sqrt(x));
t=1e-5;
x0=0.03;
x=x0+2*t;
k=0;
while abs(x-x0)>t
k=k+1;
x=x0;
x=x0-feval(f,x0)/feval(df,x0);%Õâ¾ä»°ÓÐ´í£¬ÌáʾMatrix dimensions must agree.
end
if k==500
    disp('µü´ú´ÎÊý¹ý¶à£¬·ÀÖ¹ËÀÑ­»·ÖÕÖ¹');
else
    fprintf('µü´úµ½%d´ÎʱµÃµ½½á¹û%f\n',k,x)
end

matlabÅ£¶Ùµü´úµÄÎÊÌ⣬³öÏÖMatrix dimensions must agreµÄ´íÎó
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1.ÄãµÄx0ûÓиüÐÂ
2.±¨µÄ´í£¬µ÷ÊÔʱºò·¢ÏÖfeval(df,x0)ÊǿվØÕó
2Â¥2015-05-18 11:45:01
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Ò¹µÄÄþ¾²

½ð³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by ²ÄÁÏÁÎ at 2015-05-18 11:45:01
1.ÄãµÄx0ûÓиüÐÂ
2.±¨µÄ´í£¬µ÷ÊÔʱºò·¢ÏÖfeval(df,x0)ÊǿվØÕó

»¹ÊDz»ÖªµÀÔõô¸Ä£¬ÎÒÊdzõѧ£¬ÒòΪÓõ½ÏÖѧµÄ£¬ËùÒÔ»ù´¡²»ÔõôÑù¡£x0ûÓиüÐÂʲôÒâ˼
֮ǰµÄ¸³Öµ¿ÉÄÜÓÐЩ´íÎ󣬸ijÉÕâÑù»¹ÊDz»ÐУ¬Âé·³ÔÙ¿´Ò»Ï£¬Ê®·Ö¸Ðлfunction [x,fval]=newton()
clc;
syms x;
f=@(x)2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x);
df=@(x)diff(2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x));
t=1e-5;
x=0.03;
x0=x+2*t;
k=0;
while abs(x-x0)>t
k=k+1;
x0=x;
x=x0-feval(f,x0)/feval(df,x0);%Õâ¾ä»°ÓÐ´í£¬µ«²»ÖªµÀ´íÔÚÄÄÀï
end
if k==500
    disp('µü´ú´ÎÊý¹ý¶à£¬·ÀÖ¹ËÀÑ­»·ÖÕÖ¹');
else
    fprintf('µü´úµ½%d´ÎʱµÃµ½½á¹û%f\n',k,x)
end
Tomakeeverydayccount.
3Â¥2015-05-18 22:23:32
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

²ÄÁÏÁÎ

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
3Â¥: Originally posted by Ò¹µÄÄþ¾² at 2015-05-18 22:23:32
»¹ÊDz»ÖªµÀÔõô¸Ä£¬ÎÒÊdzõѧ£¬ÒòΪÓõ½ÏÖѧµÄ£¬ËùÒÔ»ù´¡²»ÔõôÑù¡£x0ûÓиüÐÂʲôÒâ˼
֮ǰµÄ¸³Öµ¿ÉÄÜÓÐЩ´íÎ󣬸ijÉÕâÑù»¹ÊDz»ÐУ¬Âé·³ÔÙ¿´Ò»Ï£¬Ê®·Ö¸Ðлfunction =newton()
clc;
syms x;
f=@(x)2*log10(5.4 ...

ÊÔÊÔÕâ¸ö¿´¶Ô²»¶Ô
function x = newton()
clc
clear
syms x f df
f = 2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x);
df = diff(2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x));
t=1e-5;
x=0.03;
x0=x+2*t;
k=0;
while abs(x-x0)>t
    k=k+1;
    x0=x;
    x=x0-double(subs(f,x0)/subs(df,x0)); % feval(f,x0)./feval(df,x0);%Õâ¾ä»°ÓÐ´í£¬µ«²»ÖªµÀ´íÔÚÄÄÀï
end
if k==500
    disp('µü´ú´ÎÊý¹ý¶à£¬·ÀÖ¹ËÀÑ­»·ÖÕÖ¹');
else
    fprintf('µü´úµ½%d´ÎʱµÃµ½½á¹û%f\n',k,x)
end

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

4Â¥2015-05-19 15:56:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Ò¹µÄÄþ¾²

½ð³æ (СÓÐÃûÆø)

Ëͺ컨һ¶ä
ÒýÓûØÌû:
4Â¥: Originally posted by ²ÄÁÏÁÎ at 2015-05-19 15:56:37
ÊÔÊÔÕâ¸ö¿´¶Ô²»¶Ô
function x = newton()
clc
clear
syms x f df
f = 2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x);
df = diff(2*log10(5.4*10^-4+2.51*10^-5/sqrt(x)) +1/sqrt(x));
t=1e-5;
x=0.03 ...

ºÜÍêÃÀ£¬Ì«¸ÐлÀ²
Tomakeeverydayccount.
5Â¥2015-05-20 08:37:09
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