matlab程序求助（有关ode15s解微分方程的）主程序：xO=[0.3\x050,3\x050.4 325];tf=13;opts = odeset('Mass','M','MassSingular','yes');[t,x] = ode15s('residu',[0 tf],xO,opts);x1=x(:,1);x2=x(:,2);plot(x1,x2,'k')A=x(:,1:3);tf=30;[t,x] = ode1
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