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


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

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

        #or create from memmory:
         my $psm= Bio::Matrix::PSM::Psm->new( -pA=>\@pA,-pC=>\@pC,-pG=>\@pG,-pT=>\@pT,
              -instances=>$instances, -e_val=>$e_val,
              -IC=>$ic, -width=>$width, -sites=>$sites)

         # where pA through pG are the respective frequencies of the matrix (see also
         # Bio::Matrix::PSM::SiteMatrix), and everything else is self-explenatory,
         # except for -instances (reference to an array of
         #  Bio::Matrix::PSM::InstanceSite objects) which is documented bellow.


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

       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.


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        to one of the Bioperl mailing lists.  Your participation is much
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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.

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AUTHOR - Stefan Kirov



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


       SiteMatrix, meme, transfac, InstanceSite


        Title   : new
        Usage   : my $psm= Bio::Matrix::PSM::Psm->new( -pA=>\@pA,-pC=>\@pC,
                                                      -IC=>$ic, -width=>$width,
        Function: Creates a new Bio::Matrix::PSM::Psm object
        Throws  :
        Example :
        Returns :  Bio::Matrix::PSM::Psm object
        Args    :  hash

        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 undef if an
                  argument is supplied that is not in
        Throws  :
        Example :
        Returns :  hash or string
        Args    :  string (IC, e_val...)

        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

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