I would like to know how to calculate the slope of a xy-graph in different zones of the curve. .

Is it possible to do it by graphically selecting the segment of the xy-graph curve?

I think you can incorperate Nadav's suggestion and the attached VI to find a solution. You may want to add another cursor to the xy plot to establish your region of interest for the dervative.
Jeremy
Attachments:
lv61_derivative_on_a_waveform_graph_and_xy_plot.vi ‏60 KB

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