Hello all! First time here. Was wondering if someone could answer this for me. I have a program that is behaving unexpectedly.

Iím using a ti 83+ programming in basic...

Hereís a snapshot of the code in question...


Code:
If [J](Y,T)<[J](Y+1,T):Then
1→S
Return
Else
ClrDraw
Text(25,30,ĒNot Allowed
For(V,1,200
End
ClrDraw
End
Output(Y,X,Ē


Now the unexpected part...Before the Text() output
My Y value is set to 7
After the text is displayed and the for loop is done I get a domain error for the final output because my Y value is somehow changed to 0

Currently to get around whatever is happening... I can store Y to a different variable, letís say U, just before the Text line and then store U back to Y just before the final output and everything is fine then. But why on earth would my Y be resetting just because I displayed some text on the graph screen?
The graph screen likes to mess with X and Y, I would advise against using them as variables in general, particularly if you're using graph screen commands like Text(). If you use other variables like A and B, you won't have this problem.
mr womp womp wrote:
The graph screen likes to mess with X and Y, I would advise against using them as variables in general, particularly if you're using the graph screen. If you use other variables like A and B, you won't have this problem.


Thanks so much! Never knew that. First time Iíve encountered this. Iíve always used x and y. Guess Iíll have to change my ways...
Because of the way the TI-OS was programmed, the variables X and more commonly Y typically get changed when messing with the graph screen. More specifically, having the graph displayed after doing a ClrDraw (the graph screen is being displayed here because of your Text() command) resets Y to 0.

As mr womp womp said, just use variables like A and B.
[quote="Michael2_3B"]Because of the way the TI-OS was programmed, the variables X and more commonly Y typically get changed when messing with the graph screen. More specifically, having the graph displayed after doing a ClrDraw (the graph screen is being displayed here because of your Text() command) resets Y to 0.

As mr womp womp said, just use variables like A and B.[/quote]

Thatís very interesting... completely understand, though it seems like the ti-os needs some tweaking then. Feel like that shouldnít happen. Is there some logical reason why it behaves that way? Was the OS made that way intentionally to prevent something catastrophic from happening? I could always rewrite it to display my message on the top line of the home screen as Iím keeping that row open; since itís just the graph screen thatís acting silly. I just like the transition between the graph and home screens...
I'm not totally sure, but I believe it has to do with the OS preparing to plot any potential graphs.
  
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