Editing matrix in a program: not updating issue

[cyrille de brébisson]

Hello

>I noted also that if I change something in the program and save, the matrix will be reset. But, indeed, one doesn't change things in a program every day

Yes, this is normal and intended.
All the Program global variables will be deleted when the program is changed (after all, it is very possible that editing the program will cause some of these variables to be erased and new ones created).
Then, upon suxesfull compilation of the program, the variables are created and initialized at the specified value.

cyrille