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Re^2: average of column

by linseyr (Acolyte)
on Sep 12, 2012 at 15:08 UTC ( #993241=note: print w/replies, xml ) Need Help??

in reply to Re: average of column
in thread average of column

The input is a tab delimited file like:
chr start end length chr1 10 50 40 chr2 20 80 60
I want to get the average length of all lines.

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Re^3: average of column
by Kenosis (Priest) on Sep 12, 2012 at 16:34 UTC

    In your OP, you show the following:

    open (MYFILE, '148-N-pvalue0.01_peaks.xls'); #READ THROUGH THE FILE while (my $line = <MYFILE>) { ...

    opening an Excel spread sheet this way will not give you access to the data you want. If you're are trying to parse an Excel spread sheet, consider using a module, like Spreadsheet::ParseExcel for the job. Otherwise, you can use "Save As..." within Excel to save the data as tab-delimited in a text file, e.g., "148-N-pvalue0.01_peaks.txt", which you can then open and process as above.

    toolic shows how to obtain the last column's average, which includes using Acme::Tools. Importantly, two other pragmas begin the solution:

    use warnings; use strict;

    Consider always beginning your scripts with these, as they'll preemptively catch any problematic areas in your scripts--likely saving you many headaches.

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