Why does ode15s open a new windows command window for each iteration?

Hi

I'm trying to solve a DAE system using ode15s. The system contains 6 differential and 10 algebraic residual equations. I know that my initial values are close to the correct values. But when I try to run my script, MATLAB opens a new windows command window for each iteration (C:\Windows\sys32\cmd.exe). The only thing displayed in the command window is my current path (in this case M:\Documents\MATLAB\) The iteration is painfully slow. How can I solve this problem?

Thanks in advance

EDIT: The same problem occurs when trying to solve the system at steady state, i.e. when using fsolve to solve g(x) = 0. So my guess is that the problem is related to solving the implicit algebraic equations.

Answer 1

[Sean de Wolski]

Ha! I was very worried when I first ran this.

Stepping through it, if you look at the end of line 230.

CPI2 = C1 + C2*TB*(C3 + C4*TB*(C5 + C6*TB));!

You have an exclamation point which is the operator that calls the command window. Simply remove this and you're all set.

[Adriaen]

That sneaky little exclamation point!

Thanks a lot, now I know what to look for next time I get this error!