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Peter Meier wrote:
> I want to show a measurement value in a diagram.
> 
> The problem is that the diagram should be visible, when new values are
> added into the diagram. There is round about one value per minute.

Try the gnuplot extension for Ruby. You can add new values to the
plot and watch it appear in real-time.

I learned this from a friend who used it to easily visualize voltage
readings from a microcontroller in real-time.
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