graphing: insert vertical line at zero-point

[vanao]

Hi, I want this:
http://img84.imageshack.us/img84/936...yfunction1.jpg
to look like this:
http://img228.imageshack.us/img228/3...yfunction2.jpg
possible?

[shg]

Add another series with two points.

[vanao]

I see what you mean, but idk how to materalize that. I tried and attached the result. Any hints?

[Andy Pope]

If you use a xy-scatter rather than a line then you can set the X axis to cross at 0.

[vanao]

very nice. ty.