Need suggestion about long matrix program

[Didier Lachieze]

(03-29-2021 06:39 PM)Amer7 Wrote:  Is there a simple code that will let me Use the values stored in M1,M2,M3 matrix memory, and when I execute the program let me see the new matrices values for viewing ?

Your program works for me and does exactly that.
With M1 being [[1,−3],[−1,1],[2,−2]], after executing function1 I get for A1: [[2,−6],[−2,2],[4,−4]] and for A2: [[0,0],[0,0],[0,0]]

However one thing that can explain that you have 0 for A1 and for A2 is if you have the spreadsheet app active, in this case when you type A1 or A2 on the command line you're referring to the A1 and A2 cells of the spreadsheet, not to your global variables which should anyway be available in the Matrix editor.