TIB: Clearing part of the graph screen


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TIB: Clearing part of the graph screen




I just bought a TI-86, so this is probably a dumb question. I was wondering
how to erase a line drawn on the graph from inside a program. I tried
"Line(x1,y1,x2,y2,0)" like it said in the manual. But that just gave me an
error.

 Also, is there any faster way to clear part of the screen than Text( with a
lot of spaces or PixelOff?

 And one more question, is there any way to detect if a variable exists from
inside a program?

Any help apreciated,
Philipp


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