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I'm trying to create a sign diagram using geogebra. Here's what I have so far:
How do I restrict the vertical lines to only display when y is greater than or equal to zero?
Files:
Screenshot 2019...
The same question 
use Ray()
Example: Ray((3, 0), (3, -1))
The easiest way is by creating a segment, since a vertical line is not a function.
Or you can write the segment in parametric form, using the Curve command.
Say you want a segment from (x0, y0) to (x0, y1): then
On peut aussi utiliser l'outil demi-droite .
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use Ray()
Example: Ray((3, 0), (3, -1))
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