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 Correlate data with different sampling frequency		  New Topic  Reply to Topic
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StephFR

2 Posts
Posted - 11/30/2008 :  03:38:42 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

I'm using origin 8.0 on Vista and I need to do multiple comparison of dataset having different sampling frequency.
For example I have a set of data where the sampling period is 10 ms and the other is 1 s and I need to do correlation between the 2.
From what I understand the correlate function works on dataset having the same sampling frequency (please correct if I'm wrong?).
So I want to decimate my data with 10 ms sampling into a 1 s set.
I understand that to prevent aliasing I need to filter those data before doing the decimation, but then how to the decimation?
How to keep 1 sample every 100 ?

Thanks.

Deanna

China
Posts
Posted - 12/01/2008 :  09:47:57 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Stephane,

Maybe you can try the reduce X-Function. Please see details here:
http://wiki.originlab.com/~originla/wiki2/index.php?title=X-Function:Reduce


Deanna
OriginLab Technical Services
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jimlake

USA
Posts
Posted - 12/08/2008 :  7:06:53 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You might be able to interpolate the 1s data to 10ms. I have done this many times with great success.
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StephFR

2 Posts
Posted - 12/14/2008 :  4:40:19 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Deanna,

I've never used those functions and the link your pointing to is poorly done to be really usefull for me: no real example, so useless for me that never worked with such kind of functions.

Any more practical solution?

Thanks.
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Echo_Chu

China
Posts
Posted - 12/15/2008 :  04:56:40 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Stephane,

You can type "reduce -d" in command window and press enter, then the dialog for reduce X-function will be opened. You can use the dialog to select data and set options.

We have also updated the wiki page and add a detail example in it
http://wiki.originlab.com/~originla/wiki2/index.php?title=X-Function:Reduce

Echo
OriginLab Corp
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Laurie

USA
404 Posts
Posted - 04/02/2010 :  11:19:06 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
In OriginPro 8.1, we have added an Analysis:Signal Processing:Decimation... tool.

OriginLab Technical Support
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