/ 
bioperl-1.0.2
/ Bio::SearchIO::Writer::HSPTableWriter

NAME

Bio::SearchIO::Writer::HSPTableWriter - Tab-delimited data for Bio::Search::HSP::HSPI objects

SYNOPSIS

Example 1: Using the default columns

use Bio::SearchIO;
use Bio::SearchIO::Writer::HSPTableWriter;

my $in = Bio::SearchIO->new();

my $writer = Bio::SearchIO::Writer::HSPTableWriter->new();

my $out = Bio::SearchIO->new( -writer => $writer );

while ( my $result = $in->next_result() ) {
    $out->write_result($result, ($in->report_count - 1 ? 0 : 1) );
}

Example 2: Specifying a subset of columns

    use Bio::SearchIO;
    use Bio::SearchIO::Writer::HSPTableWriter;

    my $in = Bio::SearchIO->new();

    my $writer = Bio::SearchIO::Writer::HSPTableWriter->new( 
                                  -columns => [qw(
                                                  query_name
                                                  query_length
                                                  hit_name
                                                  hit_length
                                                  rank
                                                  frac_identical_query
                                                  expect
                                                  )]  );

    my $out = Bio::SearchIO->new( -writer => $writer,
				  -file   => ">searchio.out" );

    while ( my $result = $in->next_result() ) {
        $out->write_result($result, ($in->report_count - 1 ? 0 : 1) );
    }

Custom Labels

You can also specify different column labels if you don't want to use the defaults. Do this by specifying a -labels hash reference parameter when creating the HSPTableWriter object. The keys of the hash should be the column number (left-most column = 1) for the label(s) you want to specify. Here's an example:

  my $writer = Bio::SearchIO::Writer::HSPTableWriter->new( 
                             -columns => [qw( query_name 
                                              query_length
                                              hit_name
                                              hit_length  )],
                             -labels  => { 1 => 'QUERY_GI',
	                                     3 => 'HIT_IDENTIFIER' } );

DESCRIPTION

Bio::SearchIO::Writer::HSPTableWriter generates output at the finest level of granularity for data within a search result. Data for each HSP within each hit in a search result is output in tab-delimited format, one row per HSP.

Available Columns

Here are the columns that can be specified in the -columns parameter when creating a HSPTableWriter object. If a -columns parameter is not specified, this list, in this order, will be used as the default.

query_name             # Sequence identifier of the query.
query_length           # Full length of the query sequence
hit_name               # Sequence identifier of the hit
hit_length             # Full length of the hit sequence
round                  # Round number for hit (PSI-BLAST)
rank
expect                 # Expect value for the alignment
score                  # Score for the alignment (e.g., BLAST score)
bits                   # Bit score for the alignment
frac_identical_query   # fraction of identical substitutions in query
frac_identical_hit     # fraction of identical substitutions in hit
frac_conserved_query   # fraction of conserved substitutions in query
frac_conserved_hit     # fraction of conserved substitutions in hit
length_aln_query       # Length of the aligned portion of the query sequence
length_aln_hit         # Length of the aligned portion of the hit sequence
gaps_query             # Number of gaps in the aligned query sequence
gaps_hit               # Number of gaps in the aligned hit sequence
gaps_total             # Number of gaps in the aligned query and hit sequences
start_query            # Starting coordinate of the aligned portion of the query sequence
end_query              # Ending coordinate of the aligned portion of the query sequence
start_hit              # Starting coordinate of the aligned portion of the hit sequence
end_hit                # Ending coordinate of the aligned portion of the hit sequence
strand_query           # Strand of the aligned query sequence
strand_hit             # Strand of the aligned hit sequence
frame                  # Reading frame of the aligned query sequence 
hit_description        # Full description of the hit sequence
query_description      # Full description of the query sequence

For more details about these columns, see the documentation for the corresponding method in Bio::Search::HSP::HSPI.

TODO

Figure out the best way to incorporate algorithm-specific score columns. The best route is probably to have algorith-specific subclasses (e.g., BlastHSPTableWriter, FastaHSPTableWriter).

FEEDBACK

Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one of the Bioperl mailing lists. Your participation is much appreciated.

bioperl-l@bioperl.org              - General discussion
http://bio.perl.org/MailList.html  - About the mailing lists

Reporting Bugs

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

bioperl-bugs@bio.perl.org                   
http://bio.perl.org/bioperl-bugs/

AUTHOR

Steve Chervitz <sac@bioperl.org>

See the FEEDBACK section for where to send bug reports and comments.

COPYRIGHT

Copyright (c) 2001 Steve Chervitz. All Rights Reserved.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

DISCLAIMER

This software is provided "as is" without warranty of any kind.

SEE ALSO

Bio::SearchIO::Writer::HitTableWriter
Bio::SearchIO::Writer::ResultTableWriter

METHODS

to_string()

Note: this method is not intended for direct use. The SearchIO::write_result() method calls it automatically if the writer is hooked up to a SearchIO object as illustrated in the SYNOPSIS section .

Title     : to_string()
          :
Usage     : print $writer->to_string( $result_obj, [$include_labels] );
          :
Argument  : $result_obj = A Bio::Search::Result::ResultI object
          : $include_labels = boolean, if true column labels are included (default: false)
          :
Returns   : String containing tab-delimited set of data for each HSP
          : in each Hit of the supplied ResultI object. 
          :
Throws    : n/a