solving ODE by ode45 with singularity

Good morning,

Enclosed are the codes.

best regards

[David Goodmanson]

Hi Babacar,

when you say the negative part of the function do you mean the negative part preserving the sign, or do you mean the absolute value of the negative part, so that you get a positive quantity?

[Torsten]

Commented from Babacar:

Hi David, It is: f^+(x)=x, if x>=0, i.e. f^+(x)=max(x,0) and f^-(x)=max(-x,0)

thanks in advance.

[Jan]

ODE45 is a numerical integration. Then do not define the variables as symbolic by sym. What does this mean: "I haven't found the expected solution"? What do you find and what do you expect.

[Torsten]

Commented from Babacar:

Hi Jan, I get some NAN. You can run the code to see what happened. I want to found the solution T of the ODE (T depends on t and x: T(t,x)), t \in [O,1] and x \in [-R,R]. best regards