Does the order of the equations in a coupled OIDENT solver matter?

Question

My code runs, however, if i change the order of the equations defined in my formula my graphs changes as well. Can somebody tell me why this is? Now i do not know what the right

Answer 1

In the second code snippet you are referring to e.g. u_1 before you assign it. The same goes for u_2 ... u_4. So whatever the values of those are before the assignments get used in the calculations for du1dt...duddt