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Top Forums Shell Programming and Scripting awk? adjacency matrix to adjacency list / correlation matrix to list Post 302560862 by agama on Saturday 1st of October 2011 10:53:28 PM
Old 10-01-2011
Quote:
Originally Posted by ltomuno
awk '{if(NR==1){while(i<NF){i++;a[i]=$i;}}else{for(i in a){print a[i]" (gg) "$1" = "$(i+1)}}}' input
Note that for(i in a) doesn't preserve order, so if column order is important, this is flawed. This also prints columns when the edge value is zero which I believe is undesired as a value of 0 in a correlation matrix indicates no edge in the graph. This also prints as col (gg) row; from the original post this should be reversed.
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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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