isopen_system

True if simulink system is loaded

ISOPEN_SYSTEM(SYS) returns logical 1 (true) if the simulink system SYS is loaded/open and logical 0 (false) otherwise.
Input SYS to function may be string or cell of strings, output will be corresponding sized array of logicals.

Example
isopen_system('mysys') returns 0
new_system('mysys')
isopen_system('mysys') returns 1
close_system('mysys')
isopen_system({'mysys','simulink'}) returns [0 1]