MATLAB problem using euler's explict method

I have already solved the two second order ODE. Write the MATLAB codes to determine and plot the trajectory of the paratrooper for the first 10 seconds using the Euler’s explicit method. I am required to develop a user-defined MALTAB function for solving a generic system of 4 first-order ODEs. I also need a clear statement section at the head and proper commentary statements in the codes. Can I use ODE 45 as a part of my codes for this question?

Answer 1

[Alan Stevens]

If you let dx/dt = vx, say, and dy/dt = vy, then the accelerations can be written as dvx/dt = -gamma/m*vx*sqrt(vx^2+vy^2), and dvy/dt = -g-...etc. You write a function that calculates the velocities and accelerations at an instant of time, and then returns them as a column vector to ode45. ode45 must call this function with a timespan and a vector with initial values for x, y, vx and vy.

doc ode45

for more detail.