Hi all,

I am quite new to perl. I have two text files each of which looks something like:

Dmel_mitochondrion 1 A 17 17 0 0 0
Dmel_mitochondrion 2 A 22 22 0 0 0
Dmel_mitochondrion 3 T 29 0 21 0 0
Dmel_mitochondrion 4 G 46 0 0 39 0
Dmel_mitochondrion 5 A 54 53 0 0 0
Dmel_mitochondrion 6 A 63 61 0 0 0
Dmel_mitochondrion 7 T 64 0 47 0 0
Dmel_mitochondrion 8 T 72 0 54 0 0
Dmel_mitochondrion 9 G 82 0 0 73 0
Dmel_mitochondrion 10 C 106 0 0 0 77
Dmel_mitochondrion 11 C 118 0 0 0 93

Now, I want to compare each of it and print columns 1,2, 3 and 4. Further, of the last four columns whichever is showing the highest value needs to be printed out with columns 1,2,3,4 Hence output should look something like:

Dmel_mitochondrion 1 A 17 A 17
Dmel_mitochondrion 2 A 22 T 22
Dmel_mitochondrion 3 T 21 A 23
Dmel_mitochondrion 4 G 39 G 39
Dmel_mitochondrion 5 A 53 C 53

where last two columns come from second file.

This script can make my analysis quite fast. Please help.

Thanks.

Urmi

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Thanks.

Even if it is no school work, you have to ask a question that other people can understand in order to be able to help you. Your question/requirements are incomprehensible.

Some hints...

The split function will be able to split your lines by any string (or regexp) of your choosing. This should be appropriate for your task.

You could read both of those files and compare them line-by-line, provided that the sequences are always complete (meaning, 1, 2, 3, 4..., not 1, 2, 4, 5, ...). Otherwise, a perl hash might be appropriate.