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cologate007

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[ÇóÖú] matlab¶Ôº¬±´Èû¶ûº¯ÊýµÄ³¬Ô½·½³ÌÇó¸ù ÒÑÓÐ1È˲ÎÓë

ÓÐÒ»¸öº¬Óб´Èû¶ûº¯ÊýµÄ³¬Ô½·½³Ì£¬ÓÃsolveº¯ÊýÇó½â£¬ÊäÈëmatlabÖ±½Ó¸ø³öÁËÒ»¸ö¸´Êý½á¹û£¬µ«ÊÇʵ¼ÊÉϳ¬Ô½·½³ÌÊÇÓкܶà¸ö¸ùµÄ£¬²»ÖªµÀ¸ø³öµÄÕâ¸ö½âÊǵڼ¸½×µÄ£¿ÔõôÑù²ÅÄܵõ½ËüµÄµÚn£¨ÈÎÒâµÄ£©½×¸ùÄØ£¿²ÉÓÃÅ£¶Ùµü´ú·¨¸ø¶¨²»Í¬µÄ³õÖµ¿ÉÒÔ¼ÆËãµÃµ½²»Í¬µÄ¸ù£¬µ«ÊÇÒ²²»ÄÜÈ·¶¨Êǵڼ¸½×¡£²»ÖªµÀÂÛ̳ÀïÓÐûÓÐÅóÓÑÓиüºÃµÄ¼ÆËã·½·¨£¿º¯Êý¾Í²»ÌùÁË£¬ÏÂÃæÊÇÅ£¶Ùµü´ú·¨µÄmatlab³ÌÐò£¬º¯Êý¼ûÀïÃæµÄf¡£ÇëÁ˽âµÄÅóÓѸøµãÒâ¼û£¬¸Ðл£¡

clc;clear;close all;
r0=0.0125;
r=r0;
fre=1000;
z=0;
l=0.122;
r0=0.0125;
r=r0;
rou0=1000;
a0=1500;
pi=3.1415926;
k0=2*pi*f/a0;
Zw=1800000*(1+i);
%Å£¶Ùµü´ú·¨
syms f kr;
f=subs('besselj(0,kr*r0)-kr*r0*i*Zw/(rou0*a0*k0*r0)*besselj(1,kr*r0)');
df=diff(f);
kr0=0.1-0.1*i;
e1=0.1e-10;
e2=0.000005;
N=100;
k=1;
while (k<N)
  kr=kr0;
if abs(eval(f))<e1
fprintf('ÆæÒì!\nkr=%.6f\nµü´ú´ÎÊýΪ:%d\n',kr0,k)
break
else
kr1=kr0-eval(f)/eval(df);
if abs(kr1-kr0)<e2
fprintf('kr=%.6f\nµü´ú´ÎÊýΪ:%d\n',kr1,k)
break
else
kr0=kr1;
k=k+1;
end
end
end
if k>=N
fprintf('ʧ°Ü\n')
end
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cologate007

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ÒýÓûØÌû:
2Â¥: Originally posted by mathstudy at 2015-03-23 09:33:06
·½³Ì µÄ¿ÉÒÔ´ÓСµ½´óÒÔ´ËÅÅÁе½ÎÞÇî´ó£¬ÖÁÓÚÖ±½ÓÇóµÚn¸ö¸ùȷʵ²»ºÃÇó£¬ ¶øÇÒµü´ú·¨Çó³öµÄ¸ùÒ²ÄÑÃ⩵ô....½¨ÒéÂ¥Ö÷´ÓÍøÉÏËÑË÷Ïà¹Ø³ÌÐò£¬ÓиßÊÖ·ÖÏíÀàËÆµÄMathematica³ÌÐò  Çó½â³¬Ô½·½³ÌÔÚÈÎÒâÇø¼äµÄ¸ù

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3Â¥2015-03-23 14:15:33
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cologate007: ½ð±Ò+2, ¡ïÓаïÖú 2015-03-23 14:15:56
·½³Ì µÄ¿ÉÒÔ´ÓСµ½´óÒÔ´ËÅÅÁе½ÎÞÇî´ó£¬ÖÁÓÚÖ±½ÓÇóµÚn¸ö¸ùȷʵ²»ºÃÇó£¬ ¶øÇÒµü´ú·¨Çó³öµÄ¸ùÒ²ÄÑÃ⩵ô....½¨ÒéÂ¥Ö÷´ÓÍøÉÏËÑË÷Ïà¹Ø³ÌÐò£¬ÓиßÊÖ·ÖÏíÀàËÆµÄMathematica³ÌÐò  Çó½â³¬Ô½·½³ÌÔÚÈÎÒâÇø¼äµÄ¸ù
2Â¥2015-03-23 09:33:06
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

mathstudy

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ÒýÓûØÌû:
3Â¥: Originally posted by cologate007 at 2015-03-23 14:15:33
ллÄúµÄ»Ø¸´£¬Äã˵µÄ´ÓСµ½´óÅÅÁÐÒ²ÒªÏÈÇó³öÕâЩ¸ùÀ´£¬ÄÇôÕâ¸öÇó½âÊÇÒªÔÚ¸ø¶¨·¶Î§ÄÚÂýÂýµÄµü´úËã³öÀ´Â𣿶øÇÒÎÒÓе㲻Çå³þ£¬Õâ¸öµÚ¼¸½×µÄ¸ùÊǸù¾Ý¸´ÊýµÄ·ùÖµµÄ´óСÀ´ÅжϵÄÂð£¿...

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4Â¥2015-03-24 09:44:38
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

cologate007

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ÒýÓûØÌû:
4Â¥: Originally posted by mathstudy at 2015-03-24 09:44:38
³¬Ô½·½³ÌµÄ¸ùÊǵü´ú³öÀ´µÄ£¬¼ÈÈ»Êǵü´úËã·¨£¬Ò»°ãÊÇÒª¸ø¶¨µü´úµÄ³õÖµ»òÕß³õÊ¼Çø¼äµÄ¡£µ«ÊÇÂ¥Ö÷˵µÄµÚ¼¸½×¸ù£¬ÎҾͲ»ÉõÃ÷°×ÁË£¿¿ÉÒÔÊÇÈÎÒâ½×£¿...

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5Â¥2015-03-24 14:20:53
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