Matrix calculations on the HP-42S/Free42/DM-42

[JSBach]

Hi,

the HP-42S (and for compatibility reasons also Free42 and the DM-42)
has a IMO severe bug in the matrix editor:
It creates a "0" value in the Y register for no reason at all.

This considerably complicates the matrix calculations:
Every time you enter a matrix or look up a result you have to
(remember to) press [x<>y] and [RDN] to get the 0 out of the way
if you want to do further calculations.

How does one handle this in the best way?
You can store the matrices in variables, but eventually you want to see the results,
and then you have the "0" again.

Does anyone use matrix operations in the HP-42S/Free42/DM-42 at all?

Regards
JSBach