I don't understand the HP-50g, what am I missing?

[drbarnack]

(04-08-2024 08:34 PM)bxparks Wrote:  5) How do I Invoke the Equation Writer on a Previously Entered Equation?

One of the first examples of using the Equation Writer (RightShift+EQW) is on page 1-13, which has the following example, sqrt(3 * (5-1/(3*3))/(23^3) + e^2.5), which looks like this in MathJax/Latex mode:

\[
\sqrt{\frac{3\cdot(5 - \frac{1}{3 \cdot 3})}{23^3}+e^{2.5}}
\]

I have tried to enter this equation into EQW about 4-5 times over 3 months, and I have never been able to enter it correctly. I cannot seem to be able figure out how to use the arrow keys to get to the correct location to remove or add the correct parenthesis or term. (Amusingly, I was able to enter this expression correctly in RPN mode on the first try.)

So I enter the incorrect equation, and it shows up on the RPL stack, and I can see that it is wrong. How do I edit that equation?? I have tried everything:

• I scroll up to that term with the arrow keys, hit RightShift+EQW, and my expectation is that it should copy that back into the EquationWriter. Nope.
• I scroll up, hit RightShift+COPY, then go into RightShift+EQW, then hit RightShift+PASTE. Nothing
  

I have searched the User's Guide for information on how to edit a previously entered equation. It must be in there somewhere in the 887 pages, but I cannot find it.

This had been bothering me too, so I think I tracked it down. On page G-2 of the AUR it says you can hold down left shift and down arrow ("LS & DA") to invoke VISITB ("VISIT Best?") for variables, EDITB for everything else.

And then looking up VISITB/EDITB in the AUR says that for a specified variable, opens the contents in the most suitable editor for the object type. For example, if the variable holds an equation, open in the Equation Editor.

(FWIW I'm coming from both a HP 48 GX and a HP Prime. I wasn't sure if I was going to like the keyboard layout but it's fine, the SD card slot makes getting stuff back and forth from the PC much easier, and I feel like the proverbial snail riding on the back of a turtle -- I was blown away by Fast3D plot.)