(用matlab画相平面图)x'=2x+3y,y'=2x+y,x(0)=-2.7,y(0)=2.8 0<t<10...答:(2) x’=2x+3y, y’=2x+y, x(0)=-2.7,y(0)=2.8, 0<t<10, 作相平面图。解:使用matlab工具:先解微分方程组:x’=2x+3y, y’=2x+y, x(0)=-2.7,y(0)=2.8, 0<t<10,(1)建立.m文件:funtt.m function y=funtt(t,y)[2*y(1)+3*y(2);2*y(1)+y(2)];...
matlab 二阶微分方程 求解答:theta=pi/6;[x,y]= ode45(@odefun,[0,0.18],[0.5,theta])plot(x,y),grid on legend('y (x)','y’(x)')xlabel('x'),ylabel('y (x),y’(x)')figure(2)plot(y(:,1),y(:,2)),grid on xlabel('y (x)'),ylabel('y’(x)')title('y (x)—y’(x)的相平面...
急求matlab高手啊 解决几个微分方程 本人是一点不会 貌似不是很难 高手...答:(2)x’=2x+3y, y’=2x+y, x(0)=-2.7,y(0)=2.8, 0<t<10, 作相平面图。解:使用matlab工具:先解微分方程组:x’=2x+3y, y’=2x+y, x(0)=-2.7,y(0)=2.8, 0<t<10,(1)建立.m文件:funtt.m function y=funtt(t,y)[2*y(1)+3*y(2);2*y(1)+y(2)];(...
用MATLABode45求微分方程 dy/dx + ytanx = cosx 在[0,pi/4]的数值解...答:plot(t,y,'LineWidth'),grid on legend('y(x)','dy/dx',2)xlabel('x'),ylabel({'y(x)';'dy/dx'}) %{z_1(t);z_2(t)} figure(2)plot(y(:,1),y(:,2),'LineWidth',1.5),grid on xlabel('y(x)'),ylabel('dy/dx')title('y(x)—dy/dx的相平面图');运行结果 ...
用matlab求解二阶微分方程答:[x,y]= ode45(@odefun,[0,0.18],[0.5,theta])plot(x,y),grid on legend('y (x)','y’(x)')xlabel('x'),ylabel('y (x),y’(x)')figure(2)plot(y(:,1),y(:,2)),grid on xlabel('y (x)'),ylabel('y’(x)')title('y (x)—y’(x)的相平面图');