[Dr. Geo] How do I indicate function values? (DrGeo DSL)

[H. Hirzel]

Hi Hilaire

I have the following code

| sketch f     |
sketch := DrGeoSketch new axesOn gridOn.
f := [ :x | 0.2 * x * x - 1].
sketch plot: f from: -6 to: 6.

If I execute it I get two points without names.

One on the x-axis and one on the graph.

The point on the x-axis may be dragged to the right and the point on the graph follows.

How make the y-value of the point on the diagram appear?

Regards

Hannes

quadratic_function.png
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