Matrix calculations on the HP42S/Free42/DM42

11202020, 08:51 AM
Post: #1




Matrix calculations on the HP42S/Free42/DM42
Hi,
the HP42S (and for compatibility reasons also Free42 and the DM42) 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 HP42S/Free42/DM42 at all? Regards JSBach 

11202020, 09:17 AM
Post: #2




RE: Matrix calculations on the HP42S/Free42/DM42
No you don't?
When you just browse the matrix and EXIT, the stack is not disturbed. When you enter a new number in the first cell, the previous content is lifted up. I will be the first to admit that EDIT should've disabled stack lift, as the > etc. do; but that is not the case, and it would mess up older programs to change it now. Cheers, Werner 41CV†,42S,48GX,49G,DM42,DM41X,17BII,15CE,DM15L,12C,16CE 

11232020, 08:35 AM
Post: #3




RE: Matrix calculations on the HP42S/Free42/DM42
Hello Werner,
thanks for the info! Regards JSBach 

05302022, 02:05 PM
Post: #4




RE: Matrix calculations on the HP42S/Free42/DM42
I ran into this issue yesterday and it was causing me all kinds of confusion. I found that simply hitting the > and cycling all the way through and back to element 1:1, Stack Lift is disabled and I can key in my numbers without getting the zero on the Y stack.
This is exactly what Werner described above and it took me a minute to understand. HP48GX, HP42s and DM42. 

05312022, 06:41 AM
Post: #5




RE: Matrix calculations on the HP42S/Free42/DM42
(11202020 08:51 AM)JSBach Wrote: press [x<>y] and [RDN] to get the 0 out of the way (05302022 02:05 PM)DM48 Wrote: hitting the > and cycling all the way through and back to element 1:1, Stack Lift is disabled Or then you use the ⬅ key (CLX) before entering the number in the first cell. (11202020 09:17 AM)Werner Wrote: I will be the first to admit that EDIT should've disabled stack lift, as the > etc. do; I second that. 

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