Outputting using a variable for coordinates?

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Summary:

I'm trying to make a something move across the screen once whenever I press enter, but I don't want to make new outputs for every enter command.

Outputting using a variable for coordinates?

Iabne 08 Sep 2017 20:16

I want to do this

:A=16
:Lbl 1
:Output(randInt(1,8),A,"I
:Pause
:A-1->A
:Output(randInt(1,8),A,"I
:Goto 1

However, whenever I try to execute the program, I get ERR: DOMAIN. When I Goto, I find out that it only works when I put a number in the coordinates instead of the variable A. Any thoughts?

Re: Outputting using a variable for coordinates?

jonbush 09 Sep 2017 03:39

I think the problem is that you aren't actually assigning an initial value to A. The first statement A=16 is a comparison, checking if A is equal to 16. Try this:

For(A,16,1,-1
randInt(1,8
Output(Ans,A,"I
Pause
Output(Ans,A," "
End

Last edited on 09 Sep 2017 03:40 by jonbush Show more

Re: Outputting using a variable for coordinates?

Iabne 11 Sep 2017 23:52

Ahhh, I see. Thanks very much!

Re: Outputting using a variable for coordinates?

(account deleted) 08 Sep 2017 22:31

I think personally that instead of doing A=16 at the beginning of your program:
You should do is this: (Don't worry, I had this exact same problem before when I was introduced to variables.)

16→A   //Since you did: "A=16", A was either 0,1, or less than any of these.
:Lbl 1
:Output(randInt(1,8),A,"I
:Pause
:A-1→A
:Output(randInt(1,8),A,"I
:Goto 1
--Could be--
This decreases the chances of a memory leak.
For(A,8,1,-1
Output(A,randint(1,16,"I  //This does the exact same way you want it to, but optimized.
End

Last edited on 08 Sep 2017 22:33 by (account deleted) Show more

Re: Outputting using a variable for coordinates?

Myles_Zadok 09 Sep 2017 00:30

Two things:

1: TI-84 Plus CE does not match any existing user name, your code, while it sort of replicates the original code, doesn't really solve his problem. He said in the thread summary:

"I'm trying to make a something move across the screen once whenever I press enter, but I don't want to make new outputs for every enter command."

Your code eliminates the part that makes the program only display an "I" after the ENTER key is pressed.

2: Iabne, the domain problem, at least for me, results whenever the code tries to display an "I" off screen. Hence "ERR:DOMAIN." You would have to add a conditional to your code that tests if A<1 and then tells it what to do in that event. I don't know enough about what you're trying to make with this code to tell you what the program should do if A<1, so I'll let you figure that one out on your own.

Re: Outputting using a variable for coordinates?

Trenly 09 Sep 2017 00:45

You said: "I'm trying to make a something move across the screen once whenever I press enter, but I don't want to make new outputs for every enter command."

Can you describe more exactly how you want it to move? cause that would help with getting you the exact code you need

Re: Outputting using a variable for coordinates?

Iabne 11 Sep 2017 21:26

I'd like to start a "0" at 5,16, then move it to the left one space every time I press enter