Re^2: Hash Question

It seems to be what I'm looking for but I couldn't get it to work.

This is what I have

while (my $seq = <$IN>) {  
   if ($seq =~ /^>(\w+).+\((\d+)\s+aa\)$/) {
      %sequence = (
           $1 => $2,
      );
      my $max = max(values %sequence);
         for (keys %sequence) {
            delete $sequence{$_} unless $sequence{$_} == $max
      }
      print Dumper(\%sequence);

      while ( my ($key, $value) = each(%sequence) ) {
        print $OUT "$key $value\n";
      }
   }
}
[download]

Here is an example from the hash

CIMG_00046 => 399
CIMG_00047 => 865
CIMG_00048 => 330
CIMG_00048 => 506
CIMG_00053 => 167
CIMG_00063 => 468
[download]

I want to delete "CIMG_00048 => 330" because it is less than CIMG_00048 => 506.

So I would only have

CIMG_00046 => 399
CIMG_00047 => 865
CIMG_00048 => 506
CIMG_00053 => 167
CIMG_00063 => 468
[download]

Comment on Re^2: Hash Question Select or Download Code

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Re^3: Hash Question by keszler (Priest) on Nov 23, 2009 at 03:16 UTC
use strict; use warnings; my %sequence; while (my $seq = <DATA>) { if ($seq =~ /^(\w+)\s=>\s(\d+)/) { $sequence{$1} = $2 unless defined $sequence{$1} && $sequence{$1} > + $2; } } for my $key (sort keys %sequence) { print "$key $sequence{$key}\n"; } __DATA__ CIMG_00046 => 399 CIMG_00047 => 865 CIMG_00048 => 330 CIMG_00048 => 506 CIMG_00053 => 167 CIMG_00063 => 468 CIMG_00063 => 467 CIMG_00063 => 466 CIMG_00063 => 469 CIMG_00063 => 460 __END__ CIMG_00046 399 CIMG_00047 865 CIMG_00048 506 CIMG_00053 167 CIMG_00063 469 [download] Hashes cannot have multiple same-named keys at the same level. `perl -le ' use Data::Dump qw/dump/; %hash = { a => 3, a => 2, a => 1, b => 6, }; print dump \%hash; ' { a => 1, b => 6 }` [download]	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^3: Hash Question
by keszler (Priest) on Nov 23, 2009 at 03:16 UTC

use strict;
use warnings;

my %sequence;

while (my $seq = <DATA>) {
  if ($seq =~ /^(\w+)\s*=>\s*(\d+)/) {
    $sequence{$1} = $2 unless defined $sequence{$1} && $sequence{$1} >
+ $2;
  }
}
for my $key (sort keys %sequence) {
  print "$key $sequence{$key}\n";
}

__DATA__
CIMG_00046 => 399
CIMG_00047 => 865
CIMG_00048 => 330
CIMG_00048 => 506
CIMG_00053 => 167
CIMG_00063 => 468
CIMG_00063 => 467
CIMG_00063 => 466
CIMG_00063 => 469
CIMG_00063 => 460
__END__

CIMG_00046 399
CIMG_00047 865
CIMG_00048 506
CIMG_00053 167
CIMG_00063 469
[download]

Hashes cannot have multiple same-named keys at the same level.

perl -le '
use Data::Dump qw/dump/;
%hash = {
  a => 3,
  a => 2,
  a => 1,
  b => 6,
};
print dump \%hash;
'
{ a => 1, b => 6 }
[download]

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