---
name: "Bio::Matrix::MatrixI"
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::MatrixI"
---

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

An interface for describing a Matrix

## NAME

Bio::Matrix::MatrixI - An interface for describing a Matrix

## SYNOPSIS

```
  # Get a Matrix object
```

## DESCRIPTION

This is an interface describing how one should be able to interact with a matrix.  One can have a lot of information I suppose and this outline won't really work for PWM or PSSMs.  We will have to derive a particular interface for those.

## 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 email or the web:

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

## AUTHOR - Jason Stajich

Email jason-at-bioperl.org

## APPENDIX

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

### matrix\_id

```
 Title   : matrix_id
 Usage   : my $id = $matrix->matrix_id
 Function: Get the matrix ID
 Returns : string value
 Args    :
```

### matrix\_name

```
 Title   : matrix_name
 Usage   : my $name = $matrix->matrix_name();
 Function: Get the matrix name
 Returns : string value
 Args    :
```

### get\_entry

```
 Title   : get_entry
 Usage   : my $entry = $matrix->get_entry($rowname,$columname)
 Function: Get the entry for a given row,column pair
 Returns : scalar
 Args    : $row name
           $column name
```

### get\_column

```
 Title   : get_column
 Usage   : my @row = $matrix->get_column('ALPHA');
 Function: Get a particular column
 Returns : Array (in array context) or arrayref (in scalar context)
           of values
 Args    : name of the column
```

### get\_row

```
 Title   : get_row
 Usage   : my @row = $matrix->get_row('ALPHA');
 Function: Get a particular row
 Returns : Array (in array context) or arrayref (in scalar context)
           of values
 Args    : name of the row
```

### get\_diagonal

```
 Title   : get_diagonal
 Usage   : my @diagonal = $matrix->get_diagonal;
 Function: Get the diagonal of the matrix
 Returns : Array (in array context) or arrayref (in scalar context)
 Args    : none
```

### column\_num\_for\_name

```
 Title   : column_num_for_name
 Usage   : my $num = $matrix->column_num_for_name($name)
 Function: Gets the column number for a particular column name
 Returns : integer
 Args    : string
```

### row\_num\_for\_name

```
 Title   : row_num_for_name
 Usage   : my $num = $matrix->row_num_for_name($name)
 Function: Gets the row number for a particular row name
 Returns : integer
 Args    : string
```

### num\_rows

```
 Title   : num_rows
 Usage   : my $rowcount = $matrix->num_rows;
 Function: Get the number of rows
 Returns : integer
 Args    : none
```

### num\_columns

```
 Title   : num_columns
 Usage   : my $colcount = $matrix->num_columns
 Function: Get the number of columns
 Returns : integer
 Args    : none
```

### reverse

```
 Title   : reverse
 Usage   : my $matrix = $matrix->reverse
 Function: Get the reverse of a matrix
 Returns :
 Args    :
```

### row\_names

```
 Title   : row_names
 Usage   : my @rows = $matrix->row_names
 Function: The names of all the rows
 Returns : array in array context, arrayref in scalar context
 Args    : none
```

### column\_names

```
 Title   : column_names
 Usage   : my @columns = $matrix->column_names
 Function: The names of all the columns
 Returns : array in array context, arrayref in scalar context
 Args    : none
```