local_offer Math Engineering #Euler #RK4 #Runge-Kutta #derivative #differentiation #math #midpoint 3/8-rule fourth-order method Calculus Classic fourth-order method Euler Explicit midpoint method Forward Euler Heun's method Heun's third-order method Kutta's third-order method Midpoint method Numerical differential equations Ralston's fourth-order method Ralston's method Ralston's third-order method Runge-Kutta Third-order Strong Stability Preserving Runge-Kutta (SSPRK3) derivative function modified Euler method syntax