Hello,
Can you please be more specific? You want to initialize data calculated in your Octave script to PLECS (Standalone?), correct? In the model initialization commands (Simulation menu>Simulation parameters>Initialization tab) you can directly include the Octave code, or call the m file by name if it is placed in the same directory as your model file. Let me know if this is relevant or you are trying to do something else.
Regards,
Kris