Re: how to use printf correctly...

If I understand you correctly, you have an input file with four fields per line. You want to discard the first two, and join the last two like this "G/A". You then want to print every 90th of these as a new column on each line to produce 90 lines of 301 columns. (I'm ignoring the fact that 90*301 != 10,000 :).

This sample code shows one way to do this...I've done 3 lines of 34 to save a little space:)

#! perl -slw
use strict;

# Read the file, split into fields, discard the first 2
# join fields 2/3 as required for output.

my @data = map{ join '/', (split ' ')[2,3] } <DATA>;

my @lines; # Array in which to accumulate the output.

# build each output line

for my $line ( 0 .. 2 ) { # 0 .. 89 in your app

    # by steping through the input and appending every nth element to 
+the output

    for my $col ( 0 .. 33 ) { # 0 .. 300 in your app

        $lines[ $line ] .= $data[ $line * 34 + $col ] . ' ';
    }
}

# display the output.
print for @lines;
[download]

__DATA__
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
000217 P015 A G
000217 P016 A G
000217 P008 N N
000217 P009 G G
000217 P010 A A
000217 P011 A G
000217 P012 A A
000217 P013 A G
000217 P014 A A
[download]

Output

P:\test>junk
N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/
+G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A
N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/
+G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A
N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A A/G A/
+G N/N G/G A/A A/G A/A A/G A/A A/G A/G N/N G/G A/A A/G A/A A/G A/A
[download]

Examine what is said, not who speaks.

"Efficiency is intelligent laziness." -David Dunham
"When I'm working on a problem, I never think about beauty. I think only how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong." -Richard Buckminster Fuller

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