Question about fmincopf_solver in MATPOWER

[naime ahmadi]

 Hello,
How can I use *fmincopf_solver in *MATPOWER* for *IEEE 30 bus system?

case_test = '30';
mpc = loadcase(['case',case_test]);
I do not understand how to get 'om'

* [results, success, raw] = fmincopf_solver(om, mpopt) *

Thank you in advance,
Naime