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1. ½â¸öÊý½ÏÉÙµÄÇé¿ö
Àý£ºÇó³öÈ總ͼ1Ëùʾ·½³ÌµÄÈ«²¿½â£¨·½³Ì³ö´¦£ºhttps://muchong.com/bbs/viewthread.php?tid=9911763&fpage=1£©¡£
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¸ù¾Ý¸½Í¼1£¬¿É½«Ô­Ê¼·½³ÌдΪ£º
y=(25-(3/25)*k)^2-9.8*k*tanh((1/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4)
ÓÉÓÚ´ýÇó½â·½³ÌÐÎʽ½ÏΪ¸´ÔÓ£¬Ðë¼ì²é·½³ÌµÄÊäÈëÊÇ·ñÕýÈ·¡£ÕâÀïÓõ½µÄÈí¼þÊÇMaple£¬ÀûÓøÃÈí¼þÇ¿´óµÄ¶þάÏÔʾ¹¦ÄÜ£¬¿ÉÅжϷ½³ÌÊäÈëµÄÕýÎó¡£
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¶ÔÓÚ±¾Àý£¬MATLAB´úÂëÈçÏ£º
CODE:
clear all;clc
n=5000;   
k=linspace(-1000,5000,n);
y=(25-(3/25)*k).^2-9.8*k.*tanh((1/10)*k).*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k).^2))./sinh(.1*k).^4);
figure
plot(k,y,'b',[min(k) max(k)],[0 0],'r'),axis([min(k) max(k) min(y) max(y)]);

ÉÏÊö´úÂëÖУ¬n±íʾ»æÍ¼Ê±É¢µãµÄ¸öÊý£¬nÓ¦µ±È¡Îª½Ï´óµÄÊýÖµ£¬ÒÔ·Àֹ©½â¡£
ÉÏÊö´úÂë½á¹ûÈ總ͼ3Ëùʾ¡£´Ó¸½Í¼3Öпɼû£¬Ô­·½³ÌÔÚk<100£¬ÒÔ¼°k=1000¸½½ü´æÔÚÁ½¸ö½â£»´ËÍ⣬×Ðϸ¹Û²ì¿É¼û£¬ÔÚk=0×óÓÒµÄϸ΢¾Ö²¿Ò²´æÔڽ⣬½«´Ë¾Ö²¿·Å´óÈ總ͼ4£¬¿É¼ûÔÚÕâϸ΢¾Ö²¿ÄÚ£¬´æÔÚÁ½¸ö½â¡£
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²½Öè2£ºÇó½â
¶ÔÓÚÕâÖÖ·½³Ì£¬MATLABµÄfsolveº¯Êý¿É¸ßЧÇó½â£¬¸ù¾Ý²½Öè1.2ÖеķÖÎö£¬³õֵѡΪ-0.1£¬0.1£¬100ºÍ1000£¬¾ßÌå´úÂëÈçÏ£º
CODE:
format long
[x fval]=fsolve(@(k) (25-(3/25)*k).^2-9.8*k.*tanh((1/10)*k).*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k).^2))./sinh(.1*k).^4),[-0.1,0.1,100,1000]  )

¼ÆËã½á¹û£º
CODE:
x =

  1.0e+003 *

  -0.000419092354465   0.000420785261224   0.040837844386158   1.063205199210630


fval =

  1.0e-010 *

  -0.001136868377216  -0.001136868377216   0.388240550819319   0.272848410531878

ÖÁ´Ë£¬ÓÃMATLABÇóµÃÁËÔ­·½³ÌÈ«²¿4¸ö½â¡£

µ±È»£¬ÉÏÊöÇó½â¹ý³ÌÒ²¿ÉÓÃ1stOptʵÏÖ£¬¸ù¾Ý²½Öè1.2ÖеķÖÎö£¬Í¨¹ýÏÞ¶¨Î´ÖªÊýkȡֵ·¶Î§µÄ°ì·¨£¬¿ÉͬÑùÇó½â4¸ö½â£¬¾ßÌåµÄ´úÂëÓÐ4¶Î£¬·Ö±ðÈçÏ£º
ÏÞ¶¨kСÓÚ0£º
CODE:
Parameters k[,0];
Function (25-(3/25)*k)^2-9.8*k*tanh((1/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);

¼ÆËã½á¹û£º
CODE:
Ä¿±êº¯ÊýÖµ: 1.13686837721616E-13
k: -0.419092354476606

ÏÞ¶¨kÔÚ[0£¬1]£º
CODE:
Parameters k[0,1];
Function (25-(3/25)*k)^2-9.8*k*tanh((1/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);

¼ÆËã½á¹û£º
CODE:
Ä¿±êº¯ÊýÖµ: 1.13686837721616E-13
k: 0.420785261224372

ÏÞ¶¨kÔÚ[10£¬100]£º
CODE:
Parameters k[10,100];
Function (25-(3/25)*k)^2-9.8*k*tanh((1/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);

¼ÆËã½á¹û£º
CODE:
Ä¿±êº¯ÊýÖµ: 0
k: 40.8378443861602

ÏÞ¶¨k>500£º
CODE:
Parameters k[500,];
Function (25-(3/25)*k)^2-9.8*k*tanh((1/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);

¼ÆËã½á¹û£º
CODE:
Ä¿±êº¯ÊýÖµ: 1.81898940354586E-12
k: 1063.20519918986

2. ½â¸öÊý½Ï¶àµÄÇé¿ö
¶ÔÓÚ½â¸öÊý½Ï¶àµÄÇé¿ö£¬²ÉÓÃÉÏÊöÈ˹¤Ñ¡È¡³õÖµµãµÄ°ì·¨½«±È½ÏµÍЧ¶øÇÒÈÝÒש½â£¬¾ÙÀýÈçÏ£º
Ç󷽳̣ºy=sin(10*x)-log10(x) µÄÈ«²¿½â£¨·½³Ì³ö´¦£ºhttps://muchong.com/bbs/viewthread.php?tid=9425648&fpage=1£©¡£
ÓÉÓÚÔ­·½³ÌÐÎʽºÜ¼òµ¥£¬ÎÞÐè½øÒ»²½¼ì²é·½³ÌÊäÈëµÄÕýÎ󣬲ÉÓÃMATLAB¿É»æÖƸ÷½³ÌÔÚ[0£¬100]·¶Î§ÄÚµÄͼÐΣ¨ÓÉÓÚ·½³ÌÖжÔÊýµÄ´æÔÚ£¬x<0ʱ£¬²»´æÔÚʵÊý½â£¬¹Êx<0µÄÇé¿öÎãÐ뿼ÂÇ£©£¬´úÂëÈçÏ£¬½á¹ûÈ總ͼ5Ëùʾ¡£
CODE:
clear all;clc
n=5000;
x=linspace(0,100,n);
y=sin(10*x)-log10(x);
figure
plot(x,y,'b',[min(x) max(x)],[0 0],'r');

ÇóÈ¡¶à½âµÄ·ÇÏßÐÔ´úÊý·½³ÌËùÓÐÊýÖµ½âµÄ·½·¨-4
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¿É¿´µ½£¬¸Ã·½³Ì½âµÄ¸öÊý¼«¶à£¬²ÉÓÃÉÏÊöÈ˹¤Ñ¡È¡³õÖµµãµÄ·½·¨¾ÍÄÑÒÔʵʩÁË¡£¶ÔÓÚÕâÖÖÇé¿ö£¬×÷ÕßµÄ˼·ÊÇÕâÑùµÄ£º´ÓͼÐÎÉÏÖÁÉÙÄܹ۲쵽ÕâЩ½â´ó¸ÅµÄȡֵ·¶Î§£¬ÔÚÕâȡֵ·¶Î§Ö®Äڹ㡰ÈöÍø¡±£¬È¡×ã¹»¶àµÄ³õÖµ£¬Çó³öÀ´µÄ½á¹û¾ÍÄܱéÀúÈ«²¿½â¡£µ±È»ÓÉÓÚѡȡ³õÖµµÄ¸öÊý´óÓÚ½âµÄ¸öÊý£¬Çó³öÀ´µÄ½á¹ûÖп϶¨»áÓÐÖØ¸´µÄ£¬ÔÚ´úÂëÖмÓÒ»¶ÎÈ¥ÖØµÄº¯Êý£¬¼´¿É½«ËùÓнâÇó³öÀ´£¬¾ßÌåµÄMATLAB´úÂëÈçÏ£º
CODE:
clear all;clc
x=fsolve(@(x) sin(10*x)-log10(x),linspace(0.2,9.7,100));
x=round(1e6*x)/1e6;
x_answer=unique(x)

¼ÆËã½á¹û£º
CODE:
x_answer =

  Columns 1 through 13

    0.3601    0.6064    0.9449    1.2669    1.5516    1.9135    2.1649    2.5552    2.7814    3.1945    3.3997    3.8322    4.0192

  Columns 14 through 26

    4.4690    4.6394    5.1052    5.2602    5.7410    5.8812    6.3767    6.5024    7.0123    7.1236    7.6482    7.7445    8.2845

  Columns 27 through 31

    8.3649    8.9219    8.9842    9.5621    9.6007

ÖÁ´Ë£¬ÇóµÃÁËÔ­·½³ÌÈ«²¿µÄ31¸ö½â£¨Èç¹ûÓÐÐËȤÊýһϸ½Í¼6ÖкìÏߺÍÀ¶Ïß½»µãµÄ¸öÊý£¬»á·¢ÏÖ½»µã¸öÊýÕýÊÇ31£©¡£

[ Last edited by ÔÂÖ»À¶ on 2018-8-17 at 21:23 ]
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Сľ³æ: ½ð±Ò+0.5, ¸ø¸öºì°ü£¬Ð»Ð»»ØÌû
ÓÃOpenLuÇó½â£º

˵Ã÷£ºLu½Å±¾¶ÔÕûÊýÔËËãºÍʵÊýÔËËãÊÇÓÐÇø±ðµÄ£¬¹Ê3/25д³ÉÁË3.0/25£¬ÆäËûÀàËÆ¡£

1. ½â¸öÊý½ÏÉÙµÄÇé¿ö
CODE:
!!!using("luopt");
f(k)=(25-(3.0/25)*k)^2-9.8*k*tanh((1.0/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);
iFind[@f];

·¢ÏÖ3¸ö½â£º
-0.4190923544648197       3.410605131648481e-013
0.4207852612243718        -1.13686837721616e-013
40.83784438616018         0.
3

ʹÓÃoptmax²ÎÊý¼Ó´óÇó½â¾«¶È£º
CODE:
!!!using("luopt");
f(k)=(25-(3.0/25)*k)^2-9.8*k*tanh((1.0/10)*k)*(1+(0.125e-2*(8+cosh(.4*k)-2*tanh(.1*k)^2))/sinh(.1*k)^4);
iFind[@f,optmax,300];

ÇóµÃÈ«²¿½â£º
-0.4190923544648196       -1.13686837721616e-013
0.4207852612243718        -1.13686837721616e-013
40.83784438616018         0.
1063.205199210628         1.818989403545857e-012
4

2. ½â¸öÊý½Ï¶àµÄÇé¿ö
CODE:
!!!using("luopt");
f(x)=sin(10*x)-lg(x) ;
iFind[@f];

·¢ÏÖ9¸ö½â£º
0.3601157243768782        -5.551115123125783e-017
0.6064214141293833        -2.220446049250313e-016
0.9449377253677708        -5.273559366969494e-016
1.266930508628267         -1.110223024625157e-016
1.55160066324603          -7.771561172376096e-016
1.913526139727183         1.498801083243961e-015
2.164907697628906         -8.326672684688674e-016
2.555238085345417         -5.551115123125783e-016
3.399721564856651         8.881784197001252e-016
9

ʹÓÃoptmax²ÎÊý¼Ó´óÇó½â¾«¶È£º
CODE:
!!!using("luopt");
f(x)=sin(10*x)-lg(x) ;
iFind[@f,optmax,10000];

ÇóµÃÈ«²¿½â£º
0.3601157243768782        -5.551115123125783e-017
0.6064214141293833        -2.220446049250313e-016
0.9449377253677708        -5.273559366969494e-016
1.266930508628267         -1.110223024625157e-016
1.55160066324603          -7.771561172376096e-016
1.913526139727183         1.498801083243961e-015
2.164907697628906         -8.326672684688674e-016
2.555238085345417         -5.551115123125783e-016
2.781398223612919         3.885780586188048e-016
3.194461071000813         2.775557561562891e-015
3.399721564856651         8.881784197001252e-016
3.832208094483737         1.554312234475219e-015
4.019201851137966         6.994405055138486e-015
4.469016047883874         -2.331468351712829e-015
4.639443152869999         -2.220446049250313e-016
5.105216467504163         -2.442490654175344e-015
5.260182951108074         -1.332267629550188e-015
5.741042948060711         3.33066907387547e-016
5.881225293357182         -9.769962616701378e-015
6.376684609873521         -1.52433621281034e-013
6.502403275288452         -2.664535259100376e-015
7.012321721086956         -1.332267629550188e-015
7.123550557006736         3.441691376337985e-015
7.648162774282883         -2.664535259100376e-015
7.744467806033315         3.987921104453562e-013
8.284508976557957         -2.442490654175344e-015
8.364860078182078         -8.881784197001252e-016
8.921930291619619         5.551115123125783e-016
8.984161831936833         5.551115123125783e-016
9.562104170355372         -2.55351295663786e-015
9.600698824827939         -6.905742644391921e-011
31
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