Hi Monks. Is there any way I can use grep to parse through a 2D array and extract rows for which particular elements are greater than a specific value. Consider the following example:
use strict;
use warnings;
use Data::Dumper;
my @arr;
@arr = (
[ 'A', 1, 0, 5, 6, 2 ],
[ 'B', 3 , 4 , 5 , 6 , 7 ],
[ 'C' , 2 , 4 ,3 ,5 ],
[ 'D' , 6 , 7 , 8 ,8 ],
[ 'E' , 2 , 5 , 4 , 5 ],
[ 'F' , 4 , 3 , 2 ,2 ],
[ 'G' , 1 , 2 , 4, 5 ],
[ 'H' , 1 , 4 , 5, 6 ]
);
my @rows = grep { grep {$_ > 6} @$_ } @arr;
print Dumper(\@rows);
The above code checks the each 'row' of the 2D array and extracts those arrays(1D)/entries if any of the column entries is greater than the threshold( in this case, 6). I would like to able to set multiple checks across multiple columns,i.e. for eg: extract rows for which the second column entry > 4 and 4th column entry > 3 and so on.
Any idea how to do this ? Thanks in advance
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: |
| & | | & |
| < | | < |
| > | | > |
| [ | | [ |
| ] | | ] |
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.