Write a user-defined MATLAB function that uses classical fourth
order Runge-Kutta method to solve a first order ODE problem dydx =
f(x, y) in a given interval a ? x ? b with initial condition y(a) =
y0 and step size of h. For function name and arguments, use [x,y] =
myrk4(f, a, b, h, y0)
Check your function to find the numerical solution for
dydx=?1.2y+7e^(?0.3x) in the interval 0 ? x ? 4 with initial
condition y(0)=3. Run your...