HP 48GX: How to edit existing equation in Equation Writer

01062021, 07:21 AM
Post: #1




HP 48GX: How to edit existing equation in Equation Writer
Is it possible to edit an existing equation in Equation Writer (EW)? I am using both droid48 and emu48, and I get the same behaviour with both.
I can easily create an equation (or expression) using EW. Once I have put the equation on the stack, however, I can't figure out how to resume editing it in EW. If position 1 on the stack has an equation, if I press <down arrow>, the equation is shown "full screen". At this point, pressing the arrow keys or, e.g., the <+> key has no effect. If I press <ON>, the rightmost element of the equation is highlighted, and the menu bar changes to RULES, ... I believe this is called Selection Mode. At this point, pressing <+> has no result (except a beep). So, from this state, is it possible to resume editing? Or is there another way to get into editing the equation, using EW? Thanks  richard 

01062021, 01:37 PM
(This post was last modified: 06122021 11:27 AM by Giuseppe Donnini.)
Post: #2




RE: HP 48GX: How to edit existing equation in Equation Writer
When you are in Selection Mode (after having pressed [ON]) you have to press the {EXIT} menu key on the far right to go into Edit Mode again.
N.B. You specifically asked about the HP48GX, but it might be of interest to know that, in order to fix a bug in the Equation Writer, this behavior was changed in ROM revision J, which was the last version of the HP48S/SX. In previous S/SX versions (A, B, C, D, and E), pressing [DownArrow] with a symbolic object on stack level 1 launched the Equation Writer directly in Edit Mode. 

01062021, 11:36 PM
Post: #3




RE: HP 48GX: How to edit existing equation in Equation Writer
Thanks, Giuseppe  I don't know how I missed that!


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