HP 50g Matrix Writer
Selecting option “8.Matrix Writer..” in the [APPS] menu launches the matrix writer or Press [Left_Shift] [MTRW]:
To exit and save Matrix, press [ENTER] to exit to the command prompt. The press [ENTER] again, to put the matrix into a “stack”. Press [STO] and [ALPHA] [A], to store matrix into the A variable.
To retrieve the Matrix from the “A” variable, type RCL(A) and press [ENTER]. Press {EDIT} Soft Key to launch Matrix Writer.