Hello everyone.I need to create an array with n values from xy graph. The values of the array should be the y values from a certain range that I want to choose from the x-axis. For example, create an array with 1000 y values of the graph in the range of 20 to 500000 (of the x-axis).

@altenbach wrote:You have an overloaded goal here. You can either have 1000 value starting with x=2e7, or you can have all values in the range 2e7 to 5e8 (1325 point in your case), but not both conditions unless you remap the data by interpolation. Do you want to do that instead? If you want exactly 1000 equally spaced interpolated points in your range (assuming the original x values are nondescending!), here's all you need to do: And since the x-values are now guaranteed to be equally spaced, a plain waveform graph is all you need, to graph dB. Just set x0 and dx of the x axis according to the ramp.