DB48X: HP48-like RPL implementation for DM42

[c3d]

Replying here to a private message containing bug reports.

Narek Wrote:Hi,
Thank you for your great work and effort I am enjoying your creation.
I'm facing some issues and suggestions using using db48x on my dm42n that I would like to repport.

1- In plot section I tried to use Xrange and Yrange option and when I indicated value (like 5) tge graph was not showing anymore and also everytine I tried to plot a function my screen turned to black. I restarted my calculator fo fix it which made me re do all the customisations that I did before.

XRange any Yrange take two values. So when you say "value (like 5)" I don't understand what you mean. If I try 5 5, this gives an "Invalid plot parameters" error. If I try just 5, this gives a "Too few arguments" error.

As for restarting the calculator, I assume you tried to interrupt program execution with EXIT and it did not work? How fast did the screen turn black, was it little by little, or all at once?

Quote:2- When I tried to solve a 2 by 3 matrix and do a summation to another 2 by 3 matrix it shows me error. [[2 3 4][1 2 3]] + [[1 2 4][1 2 3]].

The issue has been fixed in 0.8.6. Please try again and report if it still fails.

Quote:Couple of suggestions:

1- After using the plot command the function gets deleted fo no reason.

Yes, it is deleted for a reason: the command consumed it ;-) See the Stuttgart talk for the philosophy behind it. The "EQ" based plotting environment does not exist yet, what exists at the moment is just the underlying commands doing the plotting in various styles.

Quote: The function is only approachable by going to hist which makes editing the equation difficult.

There are at least three other ways to recover the function: LastArg, Undo and duplicating it before running "Plot". Each of them is pretty inexpensive.

Quote:2- I suggest to have access to history of evaluated values in stack by pressing edit. For example if I evaluate this formula '1/sqrt(2)' if I press edit I will only have access to edit the final value and not the formula. This would be very helpful for people like me who are dealing with big formulas every day and making lots of mistakes.

This already exists. Here are a few ways to do it:

1. The "History" function itself contains the last 8 things you entered, including those you did not ENTER (i.e. the history is kept if you cancel a command line with EXIT). It is quickly accessible with the "transient edit" mode, i.e. you hold the right/down arrow and hit F2 to move back in history. This is the same thing as the unshifted F2 key in the EDIT menu, which moves the cursor one word to the left, but when used at the beginning of the line, moves to the previous history entry.

2. You can put various expressions on the stack and then enter the interactive stack (left / up arrow). From there, you can "Edit" any level of the stack with F6, then bring that level down to the first level with Pick, and then do whatever operation you want with it, e.g. the Function plot.

3. You can store your expression in a variable with STO, and use the VAR menu to recall / edit / store it quickly.

Quote:3- if there could be an option to modify the editing indicator which is a vertical line with a D on it to a simple '.' Or '_' that would be great.

Can you elaborate on why you think it would be great?

The 'D' plays an important role, telling you that you are in direct entry mode, i.e. pressing the 'SIN' key will execute it, and pressing the key left of the + key will insert a space. There are a few other modes, where the same 'SIN' key will behave differently:


- 'S' means it's searching, so SIN will search for the J character incrementally.
- 'L' means entering lowercase text, 'C' uppercase text, so it will insert j or J.
- 'P' means you are in program entry mode, so it will enter the text SIN with spaces around it.
- 'A' means you are in algebraic entry mode, so it will enter the text SIN() and put the cursor inside the parentheses. If you type the R/S key left of +, it will insert =
- 'E' means that you are in expression mode inside an algebraic, i.e. inside parentheses. SIN will behave like for A, the R/S key will insert a semicolon.
- 'M' means that you are in matrix mode. This mode is not fully functional yet, for the moment it's quite similar to 'P'
- 'B' means you are in based number mode (after #). The second row of keys enters ABCDEF directly for quick hexadecimal entry
- 'U' means you are in Unit mode, which means that typing the E / EEX / x10n key would insert a unit SI prefix.

The cursor also changes colour to tell you if you are in alpha mode without having to look at the top of the screen to check.

I do not fully understand why you think not having the information would be an improvement. If this is simply a matter of personal taste regarding the shape of the cursor, I invite you to submit a patch drawing the cursor the way you like it.