Overwrite exisiting simulink file using script

Hello all,

I am trying to create a simulink file using matlab script with the commands new_system() and save_system(). Unfortunately, this command is unable to overwrite if a file with the same name already exists. I have no problem overwriting the existing files.

Can anyone suggest a way where I can do this?

[Ganesh]

Hi @Harish,

Could you please give more info on the version you are using and what command you are using? Saving a model with the same name as an existing model seems to work fine with R2023b.

[Harish]

Hi,

Thanks for the reply. I am using R2023b. I want to use save_system()

Answer 1

[Harald]

Hi,

I suppose you have looked into flags such as OverwriteIfChangedOnDisk? If these don't help, I would resort to checking if the file exists and, if so, deleting it before using the intended commands.

if exist(fname, "file")
    delete(fname)
end

Just be sure that you really do not need the old file!

Best wishes,

Harald

[Harish]

Hi,

Thanks for the answer. I am trying to use new_system(fname) first and then save_system(fname). On the next run, eventhough I delete the file manually, it says that 'fname' file already loaded.

Where exactly is the file loaded once I use new_system()?. How Can I delete it if it exists? Does bdIsLoaded work?

[Harald]

Hi,

the close_system or bdclose commands should help. You may also find it useful to use bdIsLoaded ahead of those.

Best wishes,

Harald

Answer 2

[Rishi]

Hey Harish,

I understand that you want to use the 'new_system' function to create a new Simulink model and then save that model using the 'save_system' function.

The function 'new_system' creates a new Simulink model in the memory. It works even if a model with the same name exists, but will throw a warning saying that your model is shadowing another model. Once you use 'save_system' on the new model, it overwrites the older model.

If you are unable to create a new model with the same name, the older model might be open. You can close that model first using the 'close_system' command.

You can learn more about 'new_system', 'save_system' and 'close_system' from the below documentations:

https://www.mathworks.com/help/simulink/slref/new_system.html

https://www.mathworks.com/help/simulink/slref/save_system.html

https://www.mathworks.com/help/simulink/slref/close_system.html

Hope this helps!

[Harish]

Hi Rishi,

Thankyou for the Answer. It helped. :-)