[HELP] Invalid Dimension Error

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Summary:

Whenever I run My Program, it Gives This Error

[HELP] Invalid Dimension Error

odnewl 07 Jan 2016 21:39

I am trying to make a program that draws a 5x5 picture based on a Matrix. The matrix has to have the numbers 10-24 (which correspond to the different colors on the Ti 84 CE) or 0, which will turn off the pixel. The matrix is set up like this:
[10,10,10,10,10]
[10,10,10,10,10]
[10,10,10,10,10]
[10,10,10,10,10]
[10,10,10,10,10]
This is the Program:

ClrDraw
1→X
1→Z
Z+4→V
For(Y,Z,V
For(X,1,5
If 0=[A](Y,X:Then
Pt-Off(3Y,3X)
End
For(W,10,24
If W=[A](Y,X:Then
Pt-On(3Y,3X,1,W)
End
End
End

Every time I run the program, it returns a invalid Dimension error, and I dont know why. Can anyone help?

Re: [HELP] Invalid Dimension Error

kg583 07 Jan 2016 22:56

Indeed, you should never use Y as a variable when using the graphscreen. The variable is often set to a different value due to how the calculator handles graphing.
Also, in case it helps, here's an optimized version of your program:

ClrDraw
For(Z,1,5
For(X,1,5
[A](Z,X→W
If W
Pt-On(3Z,3X,W
End
End

Considering before hand you clear the graphscreen with ClrDraw, there's no need to have the Pt-Off( at 0 (just do nothing at all). If you really need it though, you can add this to the inner For( loop right before the End's:

If not(W
Pt-Off(3Z,3X

---

The solution to a complex problem is often a simple answer.

Re: [HELP] Invalid Dimension Error

odnewl 07 Jan 2016 22:11

Got It, Don't use Y as a Variable if you are graphing on the screen.

Re: [HELP] Invalid Dimension Error

Lionel Foxcroft 17 Jan 2016 23:20

I'm pretty sure that using x can also cause problems, so just stay away from those. Coordinate variables in other graphing modes (like theta) are also problematic.

Re: [HELP] Invalid Dimension Error

jonbush 19 Jan 2016 21:25

It is safe to use X and Y if you stay on the graph screen after issuing DispGraph or another command that displays the graph screen. Y is reset to 0 by the OS when you switch to the graph screen after ClearDraw. X is also reset in all graphing modes besides Func. See this discussion at Cemetech for more information.