Bio::Tree::Tree - An implementation of the TreeI interface.
use Bio::TreeIO; # like from a TreeIO my $treeio = Bio::TreeIO->new(-format => 'newick', -file => 'treefile.dnd'); my $tree = $treeio->next_tree; my @nodes = $tree->get_nodes; my $root = $tree->get_root_node;
This object holds handles to Nodes which make up a tree.
This implementation of Bio::Tree::Tree contains Bio::Tree:::NodeI; mainly linked via the root node. As NodeI can potentially contain circular references (as nodes will need to refer to both parent and child nodes), Bio::Tree::Tree will remove those circular references when the object is garbage-collected. This has some side effects; primarily, one must keep the Tree in scope or have at least one reference to it if working with nodes. The fix is to count the references to the nodes and if it is greater than expected retain all of them, but it requires an additional prereq and thus may not be worth the effort. This only shows up in minor edge cases, though (see Bug #2869).
Example of issue:
# tree is not assigned to a variable, so passes from memory after # root node is passed my $root = Bio::TreeIO->new(-format => 'newick', -file => 'foo.txt')->next_tree ->get_root_node; # gets nothing, as all Node links are broken when Tree is garbage-collected above my @descendents = $root->get_all_Descendents;
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : new Usage : my $obj = Bio::Tree::Tree->new(); Function: Builds a new Bio::Tree::Tree object Returns : Bio::Tree::Tree Args : -root => L<Bio::Tree::NodeI> object which is the root OR -node => L<Bio::Tree::NodeI> object from which the root will be determined -nodelete => boolean, whether or not to try and cleanup all the nodes when this this tree goes out of scope. -id => optional tree ID -score => optional tree score value
Title : nodelete Usage : $obj->nodelete($newval) Function: Get/Set Boolean whether or not to delete the underlying nodes when it goes out of scope. By default this is false meaning trees are cleaned up. Returns : boolean Args : on set, new boolean value
Title : get_nodes Usage : my @nodes = $tree->get_nodes() Function: Return list of Bio::Tree::NodeI objects Returns : array of Bio::Tree::NodeI objects Args : (named values) hash with one value order => 'b|breadth' first order or 'd|depth' first order sortby => [optional] "height", "creation", "alpha", "revalpha", or coderef to be used to sort the order of children nodes. See L<Bio::Tree::Node> for details
Title : get_root_node Usage : my $node = $tree->get_root_node(); Function: Get the Top Node in the tree, in this implementation Trees only have one top node. Returns : Bio::Tree::NodeI object Args : none
Title : set_root_node Usage : $tree->set_root_node($node) Function: Set the Root Node for the Tree Returns : Bio::Tree::NodeI Args : Bio::Tree::NodeI
Title : total_branch_length Usage : my $size = $tree->total_branch_length Function: Returns the sum of the length of all branches Returns : real Args : none
Title : subtree_length Usage : my $subtree_size = $tree->subtree_length($internal_node) Function: Returns the sum of the length of all branches in a subtree under the node. Calculates the size of the whole tree without an argument (but only if root node is defined) Returns : real or undef Args : Bio::Tree::NodeI object, defaults to the root node
Title : id Usage : my $id = $tree->id(); Function: An id value for the tree Returns : scalar Args : [optional] new value to set
Title : score Usage : $obj->score($newval) Function: Sets the associated score with this tree This is a generic slot which is probably best used for log likelihood or other overall tree score Returns : value of score Args : newvalue (optional)
Title : height Usage : my $height = $tree->height Function: Gets the height of tree - this LOG_2($number_nodes) WARNING: this is only true for strict binary trees. The TreeIO system is capable of building non-binary trees, for which this method will currently return an incorrect value!! Returns : integer Args : none
Title : number_nodes Usage : my $size = $tree->number_nodes Function: Returns the number of nodes in the tree Returns : integer Args : none
Title : as_text Usage : my $tree_as_string = $tree->as_text($format) Function: Returns the tree as a string representation in the desired format, e.g.: 'newick', 'nhx' or 'tabtree' (the default) Returns : scalar string Args : format type as specified by Bio::TreeIO Note : This method loads the Bio::TreeIO::$format module on the fly, and commandeers the _write_tree_Helper routine therein to create the tree string.
These methods associate tag/value pairs with a Tree
Title : set_tag_value Usage : $tree->set_tag_value($tag,$value) $tree->set_tag_value($tag,@values) Function: Sets a tag value(s) to a tree. Replaces old values. Returns : number of values stored for this tag Args : $tag - tag name $value - value to store for the tag
Title : add_tag_value Usage : $tree->add_tag_value($tag,$value) Function: Adds a tag value to a tree Returns : number of values stored for this tag Args : $tag - tag name $value - value to store for the tag
Title : remove_tag Usage : $tree->remove_tag($tag) Function: Remove the tag and all values for this tag Returns : boolean representing success (0 if tag does not exist) Args : $tag - tagname to remove
Title : remove_all_tags Usage : $tree->remove_all_tags() Function: Removes all tags Returns : None Args : None
Title : get_all_tags Usage : my @tags = $tree->get_all_tags() Function: Gets all the tag names for this Tree Returns : Array of tagnames Args : None
Title : get_tag_values Usage : my @values = $tree->get_tag_values($tag) Function: Gets the values for given tag ($tag) Returns : Array of values or empty list if tag does not exist Args : $tag - tag name
Title : has_tag Usage : $tree->has_tag($tag) Function: Boolean test if tag exists in the Tree Returns : Boolean Args : $tag - tagname
Title : clone Alias : _clone Usage : $tree_copy = $tree->clone(); $subtree_copy = $tree->clone($internal_node); Function: Safe tree clone that doesn't segfault Returns : Bio::Tree::Tree object Args : [optional] $start_node, Bio::Tree::Node object