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3Â¥2016-01-25 09:57:57
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3Â¥: Originally posted by dingd at 2016-01-25 09:57:57
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k: 40.8378443861602

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ÎÒÔÚMaple ÀïÓÃsolve ÃüÁîµÃµ½µÄÖµÊÇ0.
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4Â¥2016-01-25 10:18:17
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hylb3020: ½ð±Ò+15, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2016-01-25 20:14:27
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CODE:
function solve_neq
clear all;clc

k=linspace(0,100,1000);
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(1)
plot(k,y,'b',[min(k) max(k)],[0 0],'r'),axis([min(k)-1 max(k)+1 min(y)-100 max(y)+300])

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)
[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),10)

½âx1 =

   0.420785261224372


²Ð²îfval 1=

   -1.136868377216160e-013

½âx2 =

  40.837844386160207


²Ð²îfval 2 =

   -2.842170943040401e-013
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5Â¥2016-01-25 16:36:01
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5Â¥: Originally posted by ÔÂÖ»À¶ at 2016-01-25 16:36:01
ÕÒµ½Á½¸ö½â£º


function solve_neq
clear all;clc

k=linspace(0,100,1000);
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(1)
p ...

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vv0147

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7Â¥2016-01-26 07:51:43
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xjinxjtu

Ìú¸Ëľ³æ (СÓÐÃûÆø)

8Â¥2016-01-26 08:35:29
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ÔÂÖ»À¶

Ö÷¹ÜÇø³¤ (Ö°Òµ×÷¼Ò)

¶ÔÕâ¸öÎÊÌâ½øÐÐÁ˸üÉîÈëµÄ·ÖÎö£¬¸ù¾ÝͼÐλù±¾È·¶¨Ô­ÎÊÌâÓÐËĸö½â£¬Í¨¹ý¸Ä±äMATLAB fsolveº¯Êý³õÖµ£¬ÕÒµ½Á˶îÍâµÄÁ½¸ö½â£º
x =

    1.063205199212810e+003


fval =

    3.212335286661983e-008

ÒÔ¼°
x =

  -0.419092354464820


fval =

   -1.136868377216160e-013
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