Write a function that simulates a dynamic system using RK$-4$ integration. This is a very commonly used integration method since it's accurate and can accommodate a wide variety of dynamic systems. However, it's not real$-$time $-$ so using it for HIL simulation or control system deployment is not technically appropriate.

Most of the solution is provided though you'll need to fix a few things. The workflow is much like myEuler.m and myAB$2.$m that you wrote, however, the updates are quite tricky since they require fractional time steps during function evaluations and intermediate values.