Before I begin to introduce my question, you have to know that I'm not the best programmer. I know quite a few commands, but I think I don't know much about how to use a lot of commands.

I have made a periodic table-program with TI-Basic. My problem is: it is way too large. Maybe there are some commands I don't know of and are important to be efficacious with space.

You can help me. I know it.

ps. the text in the program is dutch.

Code:

At the end of your program, after Lbl 4.

DelVar ADelVar B etc for all the variables, and remove the Stop, since the program would end after all the DelVar commands.

Also, your 'If θ=H/HE/LI etc will not work at all, you can't use strings in this manner. You need to utilize a Str variable. So if you choose Str5, it would look more like If Str5="H" and things like that. You might also get rid of the outputs and change them to something like

Disp "1 H","LIJST 1WATERSTOF","ATOOMMASSA:","1.008KOOKPUNT:","20.3KSMELTPUNT:","14KDICHTHEID:","8.4E-5

You might plug that into the first one and see if that gives you a look like you were looking for with the outputs.

Make those changes and get back with us on your results.

It would be even better if you crammed all those strings into a string variable, then simply pulled out a substring based on which element was selected. Even better, have a delimited string for element names, a list for atomic weights, etc.

With Disp I can't use the lowest line.
Shouldn't there be a colon between DelVar A and DelVar B?

this is how it is now:
http://pastebin.com/TfJsm8MH

Edit by Kerm: Changed this one to a Pastebin.

As you know, I'm working hard to shrink this down. Right now I'm creating a formula to convert the element number to the list number. I'll post results soon.

Was just trying to work him into his own program in small progressions, help him do his own work and help him understand what it was he was doing. We'd have gotten to that part, eventually.

Nope, DelVar is a special command in that it doesn't need a colon afterwards before the next command begins. Also, I should note that your first program has a ton of memory leaks, which occur if you Goto out of an If/Then/End, For/End, While/End, or Repeat/End construct.

http://pastebin.com/raw.php?i=Y3SwG1kd

With the exclusion of LIJST and the inclusion of atomic number inputs, this imitates your program's interface down to the pixel. I won't spend an additional hour writing an essay on how it works, but I'll answer any questions in plenty of detail.

For instance, about the Repeat loop: there are three appearances of "RN" in Str2, but only one starts at an odd-numbered index; the other two are each composed of two halves of separate elements. The condition forces a landing at the correct position to derive the corresponding atomic number.

I then used a "feedback" loop that parses two major strings by playing-back the same commands but with two different inputs; in fact, I did this in two different places. The comma at the end of Str1 is not a typo. Hopefully these all hint at the fact that there is method to my madness. Maybe you can try your hand at one of the other methods used in the program to breathe new life into your LIJST section?

I think I make the LIJST section a different program.

Code:
How can there be a 0 without command or something like that?

I think there will be more questions later, but I'll keep it short this time.

0 primes the Ans variable that gets used in the loop. (The calculator uses Ans to retain the value of the most recent operation which can be stored to any type of variable.) This allows me to use the line inString(Str2,Str3,Ans+1 repeatedly; the Ans+1 begins the search anew, starting at one point ahead of where it last landed (where the new point of arrival becomes the new Ans), and this will keep updating itself until the loop's requirement is met per the odd-index rule in my last post.

Code:

It's a lookup table where each entry is accessed via 2X–1 (with X an atomic number), as handled in the output section with the sub( command; explicitly, it takes Str2, jumps to position 2X–1, then extracts from there a string of length 2.

Per my last post, Str2 may also be hired to find X given an abbreviation (Str3).