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 Differences between zickzacks in a curve		  New Topic  Reply to Topic
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carboran

6 Posts
Posted - 03/06/2014 :  04:32:41 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello

i have a data set of points, which give the following curve:
(a line connects just the points (no function))
and currently plotted with excell

https://www.dropbox.com/s/lh6qpwtmunc6m25/I20C_curve.jpg

Now what i wanna do with the data set: i wanna determine all the (x-axis) distances between the single zick zack maximas.

as you see not every single zick zack expresses an obvious tip/peak


is there a possibility to determine the distances without calculating manually the single difference?
with regards

greg

USA
1378 Posts
Posted - 03/06/2014 :  10:45:46 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
There is no one separation value, so the FFT of your data will give you a distribution of the separation values. You should find some small peaks at about 10% of the Frequency range in your FFT plots.
When you find peaks in the FFT plots, 1/PeakCenter represents the separation value in your original curve.
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carboran

6 Posts
Posted - 03/07/2014 :  2:58:51 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
its simple:
this is the answer

http://wiki.originlab.com/~originla/howto/index.php?title=Tutorial:Picking_and_Marking_Peaks

why havent i thought on the word "label peaks" before?
what a shame


with regards
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