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gatordan82
USA
7 Posts |
 Posted - 06/10/2010 : 3:58:56 PM
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originpro 8.0.63.988 SR6
windows xp
I'd like to run the pkfind x-function on a dataset and pick out 3 peaks. They always have (nearly) the same x-values, but their amplitudes can vary greatly. I know how to filter the search so that it will pick out the 3 largest peaks, but sometimes there are other peaks with greater amplitude that I'm not looking for. Is there a convenient way to limit the search to particular values of x?
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Shirley_GZ
China
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Posted - 06/11/2010 : 04:57:07 AM
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Hi,
If these peaks always have the same X values as you said, I think there is a workaround to limit the peak finding. You can specify the input data range to exclude the forth peak, such as x=[800, 3000]. Here, you can use Data Selector tool to select the data range firstly, then run the pkFind function. Or you can use the variable "iy" of function pkFind to select interesting rows.
For example,
pkFind iy:=col(b)[1:50] ocenter_x:=<input>!(<new>) ocenter_y:=<input>!(<new>)
Best regards,
Shirley
Originlab Technical Service Team |
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using pkfind x-function