---
name: "Bio::Matrix::IO"
section: "3pm"
platform: "linux"
package: "libbio-perl-perl"
version: "1.7.8-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Bio::Matrix::IO"
---

# Bio::Matrix::IO(3pm)

A factory for Matrix parsing

## NAME

Bio::Matrix::IO - A factory for Matrix parsing

## SYNOPSIS

```
  use Bio::Matrix::IO;
  my $parser = Bio::Matrix::IO->new(-format => 'scoring',
                                    -file   => 'BLOSUMN50');
  my $matrix = $parser->next_matrix;
```

## DESCRIPTION

This is a general factory framework for writing parsers for Matricies. This includes parsing output from distance output like PHYLIP's ProtDist.  Additionally it should be possible to fit parsers for PWM and PSSMs once their Matrix objects are written.

## 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 the Bioperl mailing list.  Your participation is much appreciated.

```
  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists
```

### Support

Please direct usage questions or support issues to the mailing list:

*bioperl-l@bioperl.org*

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:

```
  https://github.com/bioperl/bioperl-live/issues
```

## AUTHOR - Jason Stajich

Email jason-at-bioperl-dot-org

## APPENDIX

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

### new

```
 Title   : new
 Usage   : my $obj = Bio::Matrix::IO->new();
 Function: Builds a new Bio::Matrix::IO object
 Returns : an instance of Bio::Matrix::IO
 Args    :
```

### newFh

```
 Title   : newFh
 Usage   : $fh = Bio::Matrix::IO->newFh(-file=>$filename,-format=>'Format')
 Function: does a new() followed by an fh()
 Example : $fh = Bio::Matrix::IO->newFh(-file=>$filename,-format=>'Format')
           $matrix = <$fh>;   # read a matrix object
           print $fh $matrix; # write a matrix object
 Returns : filehandle tied to the Bio::SeqIO::Fh class
 Args    :
```

### fh

```
 Title   : fh
 Usage   : $obj->fh
 Function: Get a filehandle type access to the matrix parser
 Example : $fh = $obj->fh;      # make a tied filehandle
           $matrix = <$fh>;     # read a matrix object
           print $fh $matrix;   # write a matrix object
 Returns : filehandle tied to Bio::Matrix::IO class
 Args    : none
```

### format

```
 Title   : format
 Usage   : $format = $obj->format()
 Function: Get the matrix format
 Returns : matrix format
 Args    : none
```

### next\_matrix

```
 Title   : next_matrix
 Usage   : my $matrix = $matixio->next_matrix;
 Function: Parse the next matrix from the data stream
 Returns : L<Bio::Matrix::MatrixI> type object or undef when finished
 Args    : none
```

### write\_matrix

```
 Title   : write_matrix
 Usage   : $io->write_matrix($matrix)
 Function: Writes a matrix out to the data stream
 Returns : none
 Args    : Array of Bio::Matrix::MatrixI object
          - note that not all matricies can be converted to
            each format, beware with mixing matrix types and output formats
```

### \_load\_format\_module

```
 Title   : _load_format_module
 Usage   : *INTERNAL Matrix::IO stuff*
 Function: Loads up (like use) a module at run time on demand
```

### \_guess\_format

```
 Title   : _guess_format
 Usage   : $obj->_guess_format($filename)
 Returns : guessed format of filename (lower case)
 Args    : filename
```