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It is indeed hard
2 suggestions:
- erase the UFO before redrawing it (when you haven't clicked a button)
- use LSTO statements, then you don't have to clean up the variables. Works with REGS, too.

Cheers, Werner

Moderator note: program surrounded by 'code' tags for compactness. Yes, but it is a bit involved: use GETKEY to catch the menu keys. A few things to know: - you want GETKEY to catch only the keys you want, and do nothing on others. The simplest way is putting all key codes in ALPHA and using POSA to...

A 'perfect' function is one that mimicks the built-in functions: save X in LastX take the n arguments from the stack, compute the result in X roll down the stack and replicate reg T n-1 times These small routines will alow you to turn any of your programs into 'perfect functions'. Call XEQ "PF1", "P...

It is better to calculate the LCM(a,b) as (b/GCD(a,b))*a, that way you won't lose digits if the product a*b exceeds 1e12, so Cheers, Werner

You can do it with just LBL E: Cheers, Werner

I have never seen a 16C, but restricting myself to ABS, ENTER, RDN and X<>Y, I come up with Or, a version that keeps L intact, and uses RUP (edited to remove a superfluous ENTER!) Cheers, Werner

The program is correct, Walter.
But I can't reproduce it - we have to know the guess(es) introduced for X?
Also, what's the version of the DM42? (SETUP-About)
Cheers, Werner

Joe: because it checks whether the error is less than 1e-12.
1146408/364913 - 3.14159265359 = 1.4e-12

Cheers, Werner

I’m having second thoughts on the top vs bottom-aligned fonts. 2. I'm not sure about having the UFL matrix "top aligned". By it being Bottom Aligned, it makes doing upper/lower case words simple - likewise doing subscripts/superscripts. Upper/lower case is no issue of course, that’s not what I meant...

2. I'm not sure about having the UFL matrix "top aligned". By it being Bottom Aligned, it makes doing upper/lower case words simple - likewise doing subscripts/superscripts. 3. I think it would be best to have the UFL matrix bottom aligned and then just use your DF program to adjust for a top align...