I think I've found a bug with the TI 84 OS. It only works with the variable Y, and removing ClrDraw OR the Vertical command fixes it. I have no clue what is going on.
Code: ClrDraw
1->Y
1->X
Disp Y,X
Vertical Y
Vertical X
Disp Y,X
Output:
1
1
0
1
Add a DispGraph after the ClrDraw. The calculator resets the value of Y the first time graph screen is displayed after a ClrDraw.
jonbush wrote:
Add a DispGraph after the ClrDraw. The calculator resets the value of Y the first time graph screen is displayed after a ClrDraw.
...why
I too am curious as well. How would that correctly output the second "Disp Y,X"? It seems Y is cleary "0" the second time it's called upon. Why would DispGraph fix that when added as the second line of the program? (Especially when Y is set afterwards?)
It would fix the problem because the graph is first displayed before the value of Y is set. Currently the Vertical Y command is the first time the graph is displayed, which is after the value of Y is set to 1. For instance, the following results in an output of 0:
Code: ClrDraw
1->Y
DispGraph
Disp Y
This will result in an output of 1:
Code: ClrDraw
DispGraph
1->Y
DispGraph
Disp Y
Similarly, you can put any command that displays the graph screen before the value of Y is set to fix the problem:
Code: ClrDraw
Vertical 1
1->Y
Disp Y
Vertical Y
Disp Y
In general, the dependent variable is reset when initially displaying the graph. In parametric mode, both X and Y are reset.
Redrawing the graph screen modifies the X and Y variables; it's not a TI-OS bug, and the behavior has been present since the TI-81 or TI-82 (too lazy to test).
Just tried this in jsTIfied because I didn't believe you. And you're right. I am so baffled. I thought Vertical Y would put a vertical line at 1. But it seems it does erase Y when the graph screen is loaded for the first time-ish and thus Y is then equal to 0. Fascinating.
CVSoft wrote:
Redrawing the graph screen modifies the X and Y variables; it's not a TI-OS bug, and the behavior has been present since the TI-81 or TI-82 (too lazy to test).
X is not modified in Function mode, but it is in other graphing modes.
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