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#!/usr/bin/perl
#-------------------------------------------------------------------------------
#
# Converts one column to deciBel (Db)
# db = -10 * log(x) / log(10)
#
#-------------------------------------------------------------------------------
# By default, change the first column
$colNum = 0;
if( $ARGV[0] ne '' ) { $colNum = $ARGV[0] - 1; } # Use argument as column number (transform to zero-based)
$k = -10 / log(10);
# Parse STDIN
while( $l = <STDIN> ) {
chomp $l;
@t = ();
@t = split /\t/, $l;
# Convert column to DB
if( $t[$colNum] > 0 ) { $t[$colNum] = $k * log( $t[$colNum] ); }
else { $t[$colNum] = "NA"; }
# Show all fields in this line
for( $i=0 ; $i < $#t ; $i++ ) { print "$t[$i]\t"; }
print "$t[$i]\n";
}
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