Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I am doing research work. I want to classify my context. I made a hash, the keys are ids and the values are descriptions. For the values part, the same case they use a couple of ways to descrip. like: if the value match 'ABC' and 'EDF' or match 'CDE' or match 'EDJ' and 'KIJ', then they will all belong to Case A group, I will put all those keys in one group. I made my hash: 
...;
@id=...;
foreach(@id){
   my @junkdesc=...;

   foreach(@junkdesc){
   my @data=split('..', $_);
   $desc = $data[2];
   }
   $myhash{$_}=$desc;
}

[download]
How to do that? Please help!!! and Thanks in advance!!!

Replies are listed 'Best First'.
Re: How to group keys by hash value
by broquaint (Abbot) on Apr 25, 2003 at 10:09 UTC
    A hash of hashes should do the trick 
    use Data::Dumper;

my %hash = (
  ABC => 'foo',
  DEF => 'bar',
  XXX => 'baz',
  YYY => 'quux',
);
my %casehash;

for(keys %hash) {
  $casehash{CaseA}->{$_} = $hash{$_}
    if /^[A-F]+\z/;
  $casehash{CaseZ}->{$_} = $hash{$_}
    if /^[W-Z]+\z/;
}

print Dumper(\%casehash);

__output__

$VAR1 = {
          'CaseA' => {
                       'ABC' => 'foo',
                       'DEF' => 'bar'
                     },
          'CaseZ' => {
                       'XXX' => 'baz',
                       'YYY' => 'quux'
                     }
        };

    [download]
    You might want to setup another hash to map your ids to their appropriate case groups. See. perldsc for more info on data structures in perl.
    HTH

    _________
    broquaint

[reply]
[d/l]
      You can combine it into one hash. 
      use Data::Dumper;

$hash{ABC}{desc} = "foo";
$hash{DEF}{desc} = "bar";
$hash{XYZ}{desc} = "baz";
$hash{YYY}{desc} = "quzz";

foreach $key (keys %hash){
    if ($hash{$key}{desc} =~ /^[foo|bar]+\z/) {
        $hash{$key}{group} = "CaseA"    ;
    }
    if ($hash{$key}{desc} =~ /^[baz|quzz]+\z/){
        $hash{$key}{group} = "CaseZ"    ;
    }
}

print Dumper(\%hash);

__output__

$VAR1 = {
          'ABC' => {
                     'group' => 'CaseA',
                     'desc' => 'foo'
                   },
          'DEF' => {
                     'group' => 'CaseA',
                     'desc' => 'bar'
                   },
          'XYZ' => {
                     'group' => 'CaseZ',
                     'desc' => 'baz'
                   },
          'YYY' => {
                     'group' => 'CaseZ',
                     'desc' => 'quzz'
                   }
        };

      [download]
      Cheers ^_^
[reply]
[d/l]
        Thanks for the help! I try to use it to my problem, I still have trouble, it seems only one problem or so, but I have no idea to solve it, please give hands again!! 
        $ perl lxsubcp.pl
Bareword "GTPase" not allowed while "strict subs" in use at lxsubcp.pl
+ line 105.
Bareword "protein" not allowed while "strict subs" in use at lxsubcp.p
+l line 106.
$hash{GTPase-activating proteins}{domaindescription} = "G01";
$hash{protein kinase A anchoring protein}{domaindescription} = "K01";
#line 105 and 106

Bareword "G" not allowed while "strict subs" in use at lxsubcp.pl line
+ 112.
$hash{G-protein-coupled receptor kinase}{domaindescription} = "G05";

Bareword "protein" not allowed while "strict subs" in use at lxsubcp.p
+l line 112.
Bareword "kinase" not allowed while "strict subs" in use at lxsubcp.pl
+ line 112.
Bareword "G" not allowed while "strict subs" in use at lxsubcp.pl line
+ 121.
$hash{G-alpha GTPase}{domaindescription} = "G07";
Bareword "G" not allowed while "strict subs" in use at lxsubcp.pl line
+ 123.
Bareword "protein" not allowed while "strict subs" in use at lxsubcp.p
+l line 123.
Bareword "proteins" not allowed while "strict subs" in use at lxsubcp.
+pl line 124.
Bareword "protein" not allowed while "strict subs" in use at lxsubcp.p
+l line 129.
Bareword "Serine" not allowed while "strict subs" in use at lxsubcp.pl
+ line 138.
Bareword "G01" not allowed while "strict subs" in use at lxsubcp.pl li
+ne 143.
    if ($hash{$key}{domaindescription} =~
     /^[G01|P02|R03|A01|G07|I01|I02|I06]+\Z){
        $hash{$key}{group} = "LGN";
}

Bareword "G08" not allowed while "strict subs" in use at lxsubcp.pl li
+ne 143.
Bareword "G05" not allowed while "strict subs" in use at lxsubcp.pl li
+ne 143.
Bareword "G09" not allowed while "strict subs" in use at lxsubcp.pl li
+ne 143.
Bareword "I03" not allowed while "strict subs" in use at lxsubcp.pl li
+ne 143.
Bareword "Z" not allowed while "strict subs" in use at lxsubcp.pl line
+ 143.
Bareword "Z" not allowed while "strict subs" in use at lxsubcp.pl line
+ 150.<code>
if ($hash{$key}{domaindescription} =~
 /^[R01|R07|I04|R08|G02|K02|R05|P02|R02|I04|C02|R06|C03|S01|S02|E01]+\
+Z){
        $hash{$key}{group} = "RhoGEF";
}
Execution of lxsubcp.pl aborted due to compilation errors.

        [download]
[reply]
[d/l]
Re: How to group keys by hash value
by JamesNC (Chaplain) on Apr 25, 2003 at 14:03 UTC
    ... or use Class::Struct; 
    package record;
use Data::Dumper;
use Class::Struct;
my $i = 0;

struct( 
      
    first_name     => '$', 
    last_name      => '$',
    ssn        => '$',
    nicknames    => '@',
 );
 
my $person = new record;

$person->first_name("John");
$person->last_name("Doe");
$person->ssn("123-45-6789");

my @nicks = qw( jester ice-man maverick );

$person->nicknames($i++,$_) for @nicks;

print Dumper(\$person);

print "@{$person->nicknames}";

    [download]
    lots of ways to do it.. cause hey, it's Perl :-) JamesNC
[reply]
[d/l]

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