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 FFT hi pass filter on wksheet column from Labtalk
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ashvilki

USA
10 Posts

Posted - 05/11/2003 :  8:08:36 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Is there a way to apply FFT high pass filter with a specific cutoff from LabTalk on a worksheet column without plotting the actual graph?

Thanks a lot!

jonni

United Kingdom
58 Posts

Posted - 05/23/2003 :  08:31:18 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Alexei,

I am not sure of the proper method to do this but I tried the following with success:

The FFT high pass filter code is located in GRANALY.OGS in section [HighPass]. So, select the column and in the script window type:

run.section(GRANALY,HighPass);

The pop-up window appears for you to enter the cutoff. This creates the filered data worksheet but also for some reason an extra column in the original data - I have no idea how to avoid this.

(You can check how to do this yourself: first plot the graph as you normally do, then with the script window open hold down CTRL and SHIFT then click on FFT Filter:High Pass... in the analysis menu - the command Origin calls now appears in the script window.)

I think there is also a NAG function that does the same thing from OriginC so try to post your question to the C forum.

Hope this helps.

jonni
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ashvilki

USA
10 Posts

Posted - 05/23/2003 :  2:43:34 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks, Jonni!
It did work.

Alexei
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