单摆微分方程求解:x''+(g/l)sin(x)=0,用Matlab求解,function dphi=Pendel_DGL(t,x)g= 9.81;l= 1;dphi_1=x(2);dphi_2=-g/l*sin(x(1));dphi= [dphi_1;dphi_2];[t,x]=ode45(Pendel_DGL,[0,4],[pi/2,0])我觉得思路没有错误呀
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![单摆微分方程求解:x''+(g/l)sin(x)=0,用Matlab求解,function dphi=Pendel_DGL(t,x)g= 9.81;l= 1;dphi_1=x(2);dphi_2=-g/l*sin(x(1));dphi= [dphi_1;dphi_2];[t,x]=ode45(Pendel_DGL,[0,4],[pi/2,0])我觉得思路没有错误呀](/uploads/image/z/6925959-63-9.jpg?t=%E5%8D%95%E6%91%86%E5%BE%AE%E5%88%86%E6%96%B9%E7%A8%8B%E6%B1%82%E8%A7%A3%EF%BC%9Ax%27%27%2B%28g%2Fl%29sin%28x%29%3D0%2C%E7%94%A8Matlab%E6%B1%82%E8%A7%A3%2Cfunction+dphi%3DPendel_DGL%28t%2Cx%29g%3D+9.81%3Bl%3D+1%3Bdphi_1%3Dx%282%29%3Bdphi_2%3D-g%2Fl%2Asin%28x%281%29%29%3Bdphi%3D+%5Bdphi_1%3Bdphi_2%5D%3B%5Bt%2Cx%5D%3Dode45%28Pendel_DGL%2C%5B0%2C4%5D%2C%5Bpi%2F2%2C0%5D%29%E6%88%91%E8%A7%89%E5%BE%97%E6%80%9D%E8%B7%AF%E6%B2%A1%E6%9C%89%E9%94%99%E8%AF%AF%E5%91%80)
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