How to determine some points?

Hallo,
i need to calculate the bandwidth of a filter. so i need to determine the point (nr1) and then the corresponding point (nr2) to determine the bandwidth.
How can i find firstly the value of the point (nr1) and then the corresponding point (nr2) as it shown in the attached file?
thanks
Attachments:
Untitled-1 copy.jpg ‏67 KB

Well, the problem is that your x-axis is lograrithmic and the values are not equally spaced.
I assume you want the point where the line first drops below a certain db and then get the x-value there.
I would multiply the Y data by -1 and take the log of x and use threshold 1D array. For the array input make an array of clusters, each element containing [-Y, log(x)]. Search for "(-1)* threshold" and youl'll get the corresponding log(x) from which you can calculate the desired x.
Check the online help for "threshold array" for the allowed inputs.
Please attach some data if you want more detailed help.
(If you have significanlty more noise, you might want to fit the data to a mathematical model using e.g. levenberg-Marquardt.)
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rownum<2
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