Applying Boundary Condition to ODE45

Hi all,

I have a set of coupled differential equations which are readily arranged to be solved on ode45 in a domain [0 L]. However, all the boundary conditions of the differential equations are given at x=L instead of x=0. I cannot enforce these BCs to my problem using MATLAB. How can i accomplish that ? (I would like to solve set of ODEs using 4th order Runge Katta Method)

Kind Regards

Answer 1

[Stephan]

Hi,

you can reverse tspan. If you for example use:

tspan = [20 0]

then the integration will be backwards and your condition is an initial condition.

Best regards

Stephan

[Oguz Altunkas]

was it that simple :D thanks alot Stephen

[Maomao Wang]

Awesome, that works, thanks alot Stephen.