@tomleslie 

Thank you again!

Your explanations are very helpful!

@tomleslie 

Thank you so much!

Knowing we have to use __ instead of [ ] when defining variable is a game changer ! That just solved many bugs I had with my other codes and everything works !

I'm also wondering why have you used :- between plots:-odeplot instead of plots[odeplot]? I've tried both and it seems like it does the same thing. I can't find info about :- anywhere, what does it means?