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3Â¥2015-11-29 06:31:03
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ahui728: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú, MATLABÓÃhold on£¬maple²»ÊÇ¡£Ð»Ð»£¬ÒѸ㶨¡£ 2015-01-25 08:45:52
ben_ladeng: ½ð±Ò+2, ллָ½Ì 2015-01-25 09:00:38
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2Â¥2014-12-29 09:12:08
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Math¶Öé

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Give you an example of Duffing Equation.

eqn := diff(x(t), `$`(t, 2))+0.5e-1*(diff(x(t), t))+x(t)^3 = 7.5*cos(t);
         
dsolve({eqn, x(0) = 3, (D(x))(0) = 4}, x(t));

asol := dsolve({eqn, x(0) = 3, (D(x))(0) = 4}, x(t), numeric);

with(plots);

odeplot(asol, [[t, x(t)], [t, diff(x(t), t)]], 0 .. 36, numpoints = 360);
4Â¥2017-12-17 03:38:24
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