thanks to all...but I still have problems in the sliding window part
Maybe I didn't explain it ok. What I want is to group the first column of the file in windows of 10 kbases (DNA positions) and calculate the average of column 2 for each window.

BrowserUK and Eliya: your idea works fine but it doesn't take into account the positions in column 1...and I'm stuck trying to use it.
Any idea?
Thanks!

In reply to Re: calculate average in sliding windows by marfabe
in thread calculate average in sliding windows by marfabe

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