Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked

Not able to print out hash contents correctly

by Angharad (Pilgrim)
on Mar 24, 2009 at 13:13 UTC ( #752860=perlquestion: print w/replies, xml ) Need Help??

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

I have a file that looks like this:
>34513 -------------------------------MVAIIFDMDGVLYRG -----N-RAIPGVRELIEF-------LKE-R--------G------ >22476 ------------------------------ALKAVLVDLNGTLHI- --------AVPGAQEALKR--------------------------- >56832 ------MARCERLRGA-----ALRDVLG--RAQGVLFDCDGVLWNG- ----E-RAVPGAPELLER-------LAR------------------- >12543 ---------------------------E--QFDILLLDLDGVVYVG- ----D-RLLPGARRALRR----------------------------G >29078 ---------------------------------AVLFDIDGVLVLS- ----W-RAIPGAAETVRQ-------LTH-R--------G--------
For now, I'm just interested in the 'headers' (that is, the line starting with '>'). I would like to place each of these in a hash and increment a count. So, for example, the header '>34513' would have a count value of '1', the header '>12543' count value 4 and so forth. This is what I've done so far.
#!/usr/local/bin/perl use strict; use English; use Data::Dumper; use UNIVERSAL qw(isa); use FileHandle; use Exception; my $alignment = shift; if (!$alignment || ! -e $alignment) { die new Exception("couldnt open names file $alignment $!"); } warn "# Reading alignment data"; my $alignData = getAlignData($alignment); warn "# Got data: ".scalar (keys %$alignData); ################################################# sub getAlignData { my ($fIn) = @ARG; my $fh = new FileHandle($fIn) or die ""; my $count = 0; my $hData = {}; while (my $line = $fh->getline) { my @cols = split /\s+/, $line; # search only for lines with identifier my $field = $cols[0]; my $test = substr($field, 0, 1); if("$test" eq ">") { $count++; my $hEntry = { 'identifier' => $cols[0], 'line' => $count, }; my ($record) = sort ($hEntry->{identifier}); $hData->{$record} = $hEntry; } } foreach my $k ( keys %{$hData} ) { printf "%s -> %s\n", $k, $hData->{$k}; } return $hData; }
However, when I try to print out the hash I get the following.
>34513 -> HASH(0x87a3a40) >22476 -> HASH(0x87a3980) >56832 -> HASH(0x8762380) >12543 -> HASH(0x87a3940) >29078 -> HASH(0x8892b30)
Can anyone please tell me what I may be doing wrong? Thanks in advance.

Replies are listed 'Best First'.
Re: Not able to print out hash contents correctly
by Erez (Priest) on Mar 24, 2009 at 13:44 UTC

    Each of the values in $hData is in itself a hash. You need to either dereference them, and iterate over them (like you did in foreach my $k ( keys %{$hData} )) or call Dumper ($hData->{$k}) and have it print the data-structure for you.

    "A core tenant of the greater Perl philosophy is to trust that the developer knows enough to solve the problem" - Jay Shirley, A case for Catalyst.

Re: Not able to print out hash contents correctly
by poolpi (Hermit) on Mar 24, 2009 at 15:50 UTC

    I would like to place each of these in a hash and increment a count

    Your code could be simplified and fit your needs :

    #!/usr/bin/perl use strict; use warnings; use Data::Dumper; my ( %h, $count ); while (<DATA>) { next unless /^>(\d+)/; $count++; defined $1 and $h{$1} = $count; } print Dumper \%h; __DATA__ >34513 -------------------------------MVAIIFDMDGVLYRG -----N-RAIPGVRELIEF-------LKE-R--------G------ >22476 ------------------------------ALKAVLVDLNGTLHI- --------AVPGAQEALKR--------------------------- >56832 ------MARCERLRGA-----ALRDVLG--RAQGVLFDCDGVLWNG- ----E-RAVPGAPELLER-------LAR------------------- >12543 ---------------------------E--QFDILLLDLDGVVYVG- ----D-RLLPGARRALRR----------------------------G >29078 ---------------------------------AVLFDIDGVLVLS- ----W-RAIPGAAETVRQ-------LTH-R--------G--------


    'Ebry haffa hoe hab im tik a bush'. Jamaican proverb

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: perlquestion [id://752860]
Approved by sweetblood
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (6)
As of 2023-03-26 15:01 GMT
Find Nodes?
    Voting Booth?
    Which type of climate do you prefer to live in?

    Results (63 votes). Check out past polls.