Usability - using equations

[guirossibrum]

Hello Christophe, running v0.7.8 I am trying to add an equation to the library, I see you suggest to load the config:equations.csv file, edit and then store again. I tried to type the following '"config:equations.csv"RCL' in the stack and press enter, I get Error: Syntax error I tried to type "config:equations.csv", load in the stack and then press RCL - I get recall menu with all my variables I was able to type "config:equations.csv" to stack and then run RCL from the catalog menu. This is not very friendly, maybe I am missing something.

I had a couple of ideas, which are not essentials, but they can help usability. Thank you for this great development.

• How about, when we click on XEQ (thus evoking the ' ' ), a menu shows up with frequent used characters for this type of entry? Specially useful if we dont have the overlay.

• When clicking Shift Prog and then STO, we get the store command, but when click Shift Prog then RCL it pulls the recall menu. It would be useful to have consistent.

• Is it possible to create an equation and STO it directly into the equantions.csv without accessing the csv file? the stack holds the equation in natural language but the config file uses internal language (similar, but not as good for usability) a hotkey in the Solver menu to add or edit equations would be very useful

• How do you feel about the implementation of navigation like menu found in HP48G and 50G ?

[c3d]

Hi @guirossibrum, thanks ffor your interest in DB48X.

I tried to type the following '"config:equations.csv"RCL' in the stack and press enter, I get Error: Syntax error

This is not correct RPL syntax because of the quotes. You should try without the quotes, i.e. "config:equations.csv" RCL

I tried to type "config:equations.csv", load in the stack and then press RCL - I get recall menu with all my variables I was able to type "config:equations.csv" to stack and then run RCL from the catalog menu. This is not very friendly, maybe I am missing something.

I suspect you have no overlay. The RCL key on the DM42 is labelled VAR on DB48X, and shows the variables menu, as you noticed.

The RCL command can be typed alphabetically, or is found in the MEM menu (shift-shift STO), with the label Recall.

[c3d]

How about, when we click on XEQ (thus evoking the ' ' ), a menu shows up with frequent used characters for this type of entry? Specially useful if we dont have the overlay.

The "frequently used stuff" key is the ToolsMenu on the A key, which is labelled Σ+ on the DM42. When you are in expression mode, it gives you the RealMenu.

The frequently used characters for various use cases can be found in the CHAR menu (shift-shift-2).

Do you have another suggestion for what should be shown in RPL expressions?

[c3d]

When clicking Shift Prog and then STO, we get the store command, but when click Shift Prog then RCL it pulls the recall menu. It would be useful to have consistent.

That's because RPL does not use RCL nearly as often as RPN on the HP42, so it's not a primary key. The key labelled RCL on the DM42 is labelled VAR on DB48X and invokes the VariablesMenu

That being said, if you are in program mode, and have the VariablesMenu shown, then if the variable associated with F1 is ABC, then

• F1 will enters ABC on the command line, evaluating ABC
• Shift-F1 enters 'ABC' Recall on the command line, recalling ABC
• Shift-Shift-F1 enters 'ABC' Store on the command line, storing into ABC.

[c3d]

Is it possible to create an equation and STO it directly into the equantions.csv without accessing the csv file? the stack holds the equation in natural language but the config file uses internal language (similar, but not as good for usability) a hotkey in the Solver menu to add or edit equations would be very useful

The equations.csv is intended to store "standard" equations. Normal equations can be stored in the VAR menu just like any other object. For example, you can store 1+sin X as an expresssion in a variable called SineWave.

The standard equations can be edited using the Store and Recall method on the config:equations.csv file from the calculator or from a PC. The CSV file format was chosen precisely so that it would be relatively easy to enter a large set of standard equations from a PC, and then easily solve them on the calculator. The constraints on CSV file parsing required me to store equations as CSV text fields.

That being said, adding commands to store or recall standard equations is a good idea. Future feature.

[c3d]

How do you feel about the implementation of navigation like menu found in HP48G and 50G ?

I personally don't like it, because it's neither efficient nor scalable. For efficiency, direct menus are faster. For scalability, the catalog with autocompletion scales better.

And the on-line help provides the additional documentation for commands and topics.

[guirossibrum]

Thank you. I love the work you are doing. It is a great effort to keep the 48 legacy alive and bring to the next level for future generations

Thanks

Guilherme Rossi Brum

On Tue, Jun 25, 2024 at 14:04 Christophe de Dinechin < @.***> wrote:

How do you feel about the implementation of navigation like menu found in HP48G and 50G ?

I personally don't like it, because it's neither efficient nor scalable. For efficiency, direct menus are faster. For scalability, the catalog with autocompletion scales better.

And the on-line help provides the additional documentation for commands and topics.

— Reply to this email directly, view it on GitHub https://github.com/c3d/db48x/issues/996#issuecomment-2189765643, or unsubscribe https://github.com/notifications/unsubscribe-auth/BGZ6TI7EJLODRHCLNMR7PHTZJG5NPAVCNFSM6AAAAABJ4IIAHKVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCOBZG43DKNRUGM . You are receiving this because you were mentioned.Message ID: @.***>