How graph the function and solution of a second order differential equation with Matlab in the same graph.

Question

francisco paz 2019-7-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/473347-how-graph-the-function-and-solution-of-a-second-order-differential-equation-with-matlab-in-the-same

回答： Eustace Tan 2019-7-25

How can I plot the the function and the solution in the same graph?

t=dsolve('D2x+4*Dx+4*x=t^2+exp(-2*t)','Dx(0)=1','x(0)=.5');
pretty(simplify(xt))
                                 2              2
exp(-2 t)   t   t exp(-2 t) 7   t  exp(-2 t)   t    3
--------- - - + ------------- + ------------ + -- + -
    8       2         4               2         4   8
ezplot(xt),;hold on
ezplot('D2x+4*Dx+4*x=t^2+exp(-2*t)'),
Error using ezplot
D2x+4*Dx+4*x=t^2+exp(-2*t) cannot be plotted in the xy-plane.