Provided by: libbio-perl-perl_1.7.2-2_all bug


       Bio::Tools::QRNA - A Parser for qrna output


         use Bio::Tools::QRNA;
         my $parser = Bio::Tools::QRNA->new(-file => $qrnaoutput);
         while( my $feature = $parser->next_feature ) {
           # do something here


       Parses QRNA output (E.Rivas:

       This module is not complete, but currently it packs information from each QRNA alignment
       into a single Bio::SeqFeature::Generic object.

       Not all options for QRNA output have been tested or tried.  It has been tested on sliding
       window output (-w -x) and shuffled output (-b or -B).

       See t/QRNA.t for example usage.

       At some point we may have more complicated feature object which will support this data
       rather than forcing most of the information into tag/value pairs in a SeqFeature::Generic.

       Running with -verbose => 1 will store extra data in the feature.  The entire unparsed
       entry for a particular feature will be stored as a string in the tag 'entry' it is
       accessible via:

         my ($entry) = $f->each_tag_value('entry');

       The winning model for any given alignment test will be the name stored in the primary_tag
       field of feature.  The bit score will stored in the score field.  The logoddpost is
       available via the a tag/value pair.  This example code will show how to print out the
       score and log odds post for each model.

         # assuming you got a feature already
         print "model score logoddspost\n";
         foreach my $model ( qw(OTH COD RNA) ) {
           my ($score)       = $f->get_tag_values("$model\_score");
           my ($logoddspost) = $f->get_tag_values("$model\_logoddspost");
           print "$model $score $logoddspost\n";

       The start and end of the alignment for both the query and hit sequence are available
       through the Bio::SeqFeature::FeaturePair interface, specifically
       Bio::SeqFeature::FeaturePair::feature1 and Bio::SeqFeature::FeaturePair::feature2.
       Additionally if you have run QRNA with an input file which has the location of the
       alignment stored in the FASTA filename as in (ID/START-END) which is the default output
       format from Bio::AlignIO::fasta produced alignment output, this module will re-number
       start/end for the two sequences so they are in the actual coordinates of the sequence
       rather than the relative coordinates of the alignment.  You may find the bioperl utillity
       script search2alnblocks useful in creating your input files for QRNA.

       Some other words of warning, QRNA uses a 0 based numbering system for sequence locations,
       Bioperl uses a 1 based system.  You'll notice that locations will be +1 they are reported
       in the raw QRNA output.


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       your comments and suggestions preferably to the Bioperl mailing list.  Your participation
       is much appreciated.
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       Please direct usage questions or support issues to the mailing list:

       rather than to the module maintainer directly. Many experienced and reponsive experts will
       be able look at the problem and quickly address it. Please include a thorough description
       of the problem with code and data examples if at all possible.

   Reporting Bugs
       Report bugs to the Bioperl bug tracking system to help us keep track of the bugs and their
       resolution. Bug reports can be submitted via the web:

AUTHOR - Jason Stajich

       Email jason-at-bioperl-dot-org


       The rest of the documentation details each of the object methods.  Internal methods are
       usually preceded with a _

        Title   : new
        Usage   : my $obj = Bio::Tools::QRNA->new();
        Function: Builds a new Bio::Tools::QRNA object
        Returns : an instance of Bio::Tools::QRNA
        Args    : -fh/-file filehandle/filename standard input for
                            Bio::Root:IO objects

        Title   : next_feature
        Usage   : my $feature = $parser->next_feature
        Function: Get the next QRNA feature
        Returns :
        Args    :

        Title   : PAM_model
        Usage   : $obj->PAM_model($newval)
        Example :
        Returns : value of PAM_model (a scalar)
        Args    : on set, new value (a scalar or undef, optional)

        Title   : RNA_model
        Usage   : $obj->RNA_model($newval)
        Example :
        Returns : value of RNA_model (a scalar)
        Args    : on set, new value (a scalar or undef, optional)

        Title   : seq_file
        Usage   : $obj->seq_file($newval)
        Example :
        Returns : value of seq_file (a scalar)
        Args    : on set, new value (a scalar or undef, optional)

        Title   : program_name
        Usage   : $obj->program_name($newval)
        Example :
        Returns : value of program_name (a scalar)
        Args    : on set, new value (a scalar or undef, optional)

        Title   : program_version
        Usage   : $obj->program_version($newval)
        Example :
        Returns : value of program_version (a scalar)
        Args    : on set, new value (a scalar or undef, optional)

        Title   : program_date
        Usage   : $obj->program_date($newval)
        Example :
        Returns : value of program_date (a scalar)
        Args    : on set, new value (a scalar or undef, optional)