Beloved Monks,

I have the following codes that take sequence of multiple lines then
concatenate if it doesn't begin with '>' and print the line index next to it.
See below for output.

Currently the solution I came up with is by using *array* and it somehow
looks clumsy. I couldn't think of a straighforward way that avoid using it.
In short a more elegant solution.

The reason why I want to do this is that I need to process the concatenated sequence
on the fly, without having to store it in array in the first place. There are practically
thousands of these sequences.

I wonder how would masters approach this.
#!/usr/bin/perl -w
use strict;

my @string; # Can I avoid using this array for the task?

while(<DATA>){
        s/\s//g;

        if (/^>/)
            {  push(@string,'');
           next;
        }    
         chomp;
         # concatenate current line
         # to the last array item
             $string[-1] .= $_;

}
print $_+1," : ", $string[$_],"\n" foreach (0..$#string);

__DATA__
> Seq 1 (two lines)
AAAAAAAAAAAAA
CCAAAAAAAAAAA
> Seq 2 (two lines)
AAAAAAAAAAAAA
AAAAAAAAAAAAA
> Seq 3 (one line)
TTTTTTTTTTTTAACTGAAGATTCGC

[download]
The desired output as the current code also gives is: 
1 : AAAAAAAAAAAAACCAAAAAAAAAAA
2 : AAAAAAAAAAAAAAAAAAAAAAAAAA
3 : TTTTTTTTTTTTAACTGAAGATTCGC

[download]
Thanks so much beforehand.
Regards,
Edward

In reply to How to avoid using array in concatenating string of multiple lines OR How To Read FASTA by monkfan

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.