Dear every memeber, I encountered the numerical computation on the following(adsbygoogle = window.adsbygoogle || []).push({});

differential equations. I use four-step Runge-Kutta methods to integrate, but

the result is not converge, even if I take the time step (t=0.0001).

please help me why so? Could you please tellme which Fortran subroutine can do the tasks? (I know the following equations has exact solutions.)

[tex]i\frac{dy_1}{dt}=20.0y_2; \\ i\frac{dy_2}{dt}=20.0y_1[/tex]

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# Help about the numerical computation on the following equations

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