HP 48G+: Using the Matrix Editor

[Forsea]

Hello, guys,

I have a hard time finding out how I can use the matrix editor (right-shift ENTER = MATRIX) to edit an already existing matrix M1. I have loaded M1 via the VAR menu so that its contents was in the X register, then I started the matrix editor but it was empty. I have put 'M1' into the X register, same behavior. From within the editor I did not find a way to get access to existing variables (only to put them into a single cell which is not relevant).

I have tried right-shift VAR = MEMORY and to edit M1 from there but then I'm left with the [] syntax which is not so comfortable. Going directly via VAR only allows for calling the variable M1 from the smart menu, no way here to involve the matrix editor.

I have read in the manuals, quick guide, user manual, advanced user reference, to no avail.

I'd appreciate really even the slightest of hints, thanks!!!