How do I unlock a Simulink library to make it editable?

Question

Simple question - how do I unlock a Simulink (i.e. part of MATLAB) block library to edit it?

Answer 1

There are two ways to unlock a library:

1. Direct UI method - Ultra-simple, good in at least Matlab 2019a and later - after opening the library, in the bottom left corner of the library window, there is a "lock" icon. Click it.

   

   The Library will automatically relock after saving and closing it.

2. Programmatically Unlock the Library

   • Open the library (directly or programmatically)
   • Use the following code, where my_library is the base name of the library without the *.slx extension:

set_param('my_library', 'Lock', 'off');

Note:

• If the library is currently the Simulink window in focus, you can use the gcs command (get current system) instead of the my_library name.

• set_param(gcs, 'Lock', 'off');