/ 
bioperl-1.5.2_005-RC
/ Bio::Matrix::PSM::ProtPsm

NAME

Bio::Matrix::PSM::ProtPsm - handle combination of site matricies

SYNOPSIS

use Bio::Matrix::PSM::IO;

#To get a ProtPsm object from a file use the Psm parser:
my $psmIO =  new Bio::Matrix::PSM::IO(-format=>'psiblast', -file=>$file);

# Now go through all entities in the file with next_psm, which
# returns a Psm object see Bio::Matrix::PSM::IO for detailed
# documentation (matrix predictions or matrix sequence matches or
# both):

while (my $psm=$psmIO->next_psm) {
   my %psm_header = $psm->header;
   my $ic    = $psm_header{IC};
   my $sites = $psm_header{sites};
   my $width = $psm_header{width};
   my $score = $psm_header{e_val};
   my $IUPAC = $psm->IUPAC;
   my $instances = $psm->instances;
   foreach my $instance (@{$instances}) {
     my $id = $instance->primary_id;
     #Do something with the id
   }
 }

DESCRIPTION

To handle a combination of site matrices and/or their corresponding sequence matches (instances). This object inherits from Bio::Matrix::PSM::ProtMatrix, so you can methods from that class. It may hold also an array of Bio::Matrix::PSM::InstanceSite object, but you will have to retrieve these through Bio::Matrix::PSM::ProtPsm->instances method (see below). To some extent this is an expanded ProtMatrix object, holding data from analysis that also deal with sequence matches of a particular matrix.

DESIGN ISSUES

This does not make too much sense to me I am mixing PSM with PSM sequence matches Though they are very closely related, I am not satisfied by the way this is implemented here. Heikki suggested different objects when one has something like meme But does this mean we have to write a different objects for mast, meme, transfac, theiresias, etc.? To me the best way is to return SiteMatrix object + arrray of InstanceSite objects and then mast will return undef for SiteMatrix and transfac will return undef for InstanceSite. Probably I cannot see some other design issues that might arise from such approach, but it seems more straightforward. Hilmar does not like this beacause it is an exception from the general BioPerl rules. Should I leave this as an option? Also the header rightfully belongs the driver object, and could be retrieved as hashes. I do not think it can be done any other way, unless we want to create even one more object with very unclear content.

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
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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 the web:

http://bugzilla.open-bio.org/

AUTHOR - James Thompson

Email tex@biosysadmin.com

DISCLAIMER

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

SEE ALSO

ProtMatrix, meme, transfac, psiblast, InstanceSite

APPENDIX

new

Title   : new
Usage   : my $psm = Bio::Matrix::PSM::ProtPsm->new(
             -pS => [ '0', '33', '0', '16', '1', '12', '11', '25' ],
             -pF => [ '0', '0', '2', '0', '3', '0', '0', '0' ],
             -pT => [ '0', '8', '7', '10', '1', '2', '7', '8' ],
             -pN => [ '0', '0', '2', '13', '0', '36', '1', '4' ],
             -pK => [ '0', '5', '0', '13', '1', '15', '0', '2' ],
             -pY => [ '0', '0', '0', '0', '0', '0', '0', '0' ],
             -pE => [ '0', '41', '1', '12', '0', '0', '0', '15' ],
             -pV => [ '0', '3', '9', '0', '2', '0', '3', '1' ],
             -pQ => [ '0', '0', '0', '15', '0', '4', '0', '3' ],
             -pM => [ '100', '0', '66', '0', '2', '0', '0', '0' ],
             -pC => [ '0', '0', '0', '0', '0', '0', '0', '0' ],
             -pL => [ '0', '0', '8', '0', '25', '0', '4', '0' ],
             -pA => [ '0', '10', '1', '9', '2', '0', '22', '16' ],
             -pW => [ '0', '0', '0', '0', '0', '0', '0', '0' ],
             -pP => [ '0', '0', '0', '0', '3', '1', '45', '0' ],
             -pH => [ '0', '0', '0', '0', '0', '0', '1', '0' ],
             -pD => [ '0', '0', '1', '7', '2', '2', '0', '22' ],
             -pR => [ '0', '0', '0', '3', '0', '27', '0', '0' ],
             -pI => [ '0', '0', '3', '0', '59', '1', '2', '3' ],
             -pG => [ '0', '0', '0', '1', '0', '0', '4', '1' ],
             -IC => $ic,
             -sites => $istes,
             -width => $width,
             -e_val => $e_val, 
             -instances => $instances, 
          }

Function: Creates a new Bio::Matrix::PSM::ProtPsm object
Throws  :
Example :
Returns :  Bio::Matrix::PSM::Psm object
Args    :  hash

instances

Title   : instances
Usage   :   my @instances=@{$psm->instances};
Function: Gets/sets the instances (Bio::Matrix::PSM::InstanceSite objects)
       associated with the Psm object
Throws  :
Example :
Returns :  array reference (Bio::Matrix::PSM::InstanceSite objects)
Args    :  array reference (Bio::Matrix::PSM::InstanceSite objects)
Title   : header
Usage   :  my %header=$psm->header;
       my $ic=$psm->header('IC');
Function: Gets the general information, common for most files,
      dealing with PSM such as information content (IC), score
      (e-value, etc.), number of sites (sites) and width. This
      list may expand. The current list should be in
      @Bio::Matrix::PSM::Psm::HEADER. Returns an epty list if an
      argument is supplied that is not in
      @Bio::Matrix::PSM::meme::HEADER.
Throws  :
Example :
Returns :  hash or string
Args    :  string (IC, e_val...)

matrix

Title   :  matrix
Usage   :  my $matrix = $psm->matrix;
Function:  Gets/sets the SiteMatrix related information
Throws  :
Example :
Returns :  Bio::Matrix::PSM::SiteMatrix objects
Args    :  Bio::Matrix::PSM::SiteMatrix objects