gv(3r)

NAME
gv_R - graph manipulation in R

SYNOPSIS
System.loadLibrary("gv");

USAGE

INTRODUCTION
gv_R is a dynamically loaded extension for R that provides access to the graph facilities of graphviz.

COMMANDS

New graphs

New empty graph
    SWIGTYPE_p_Agraph_t gv.graph (string name);
    SWIGTYPE_p_Agraph_t gv.digraph (string name);
    SWIGTYPE_p_Agraph_t gv.strictgraph (string name);
    SWIGTYPE_p_Agraph_t gv.strictdigraph (string name);

New graph from a dot-syntax string or file
    SWIGTYPE_p_Agraph_t gv.readstring (string string);
    SWIGTYPE_p_Agraph_t gv.read (string filename);
    SWIGTYPE_p_Agraph_t gv.read (SWIGTYPE_p_FILE f);

Add new subgraph to existing graph
    SWIGTYPE_p_Agraph_t gv.graph (SWIGTYPE_p_Agraph_t g, string name);

New nodes

Add new node to existing graph
    SWIGTYPE_p_Agnode_t gv.node (SWIGTYPE_p_Agraph_t g, string name);

New edges

Add new edge between existing nodes
    SWIGTYPE_p_Agedge_t gv.edge (SWIGTYPE_p_Agnode_t t, SWIGTYPE_p_Agnode_t h);

Add a new edge between an existing tail node, and a named head node which will be induced in the graph if it doesn't already exist
    SWIGTYPE_p_Agedge_t gv.edge (SWIGTYPE_p_Agnode_t t, string hname);

Add a new edge between an existing head node, and a named tail node which will be induced in the graph if it doesn't already exist
    SWIGTYPE_p_Agedge_t gv.edge (string tname, SWIGTYPE_p_Agnode_t h);

Add a new edge between named tail  and head nodes which will be induced in the graph if they don't already exist
    SWIGTYPE_p_Agedge_t gv.edge (SWIGTYPE_p_Agraph_t g, string tname, string hname);

Setting attribute values

Set value of named attribute of graph/node/edge - creating attribute if necessary
    string gv.setv (SWIGTYPE_p_Agraph_t g, string attr, string val);
    string gv.setv (SWIGTYPE_p_Agnode_t n, string attr, string val);
    string gv.setv (SWIGTYPE_p_Agedge_t e, string attr, string val);

Set value of existing attribute of graph/node/edge (using attribute handle)
    string gv.setv (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agsym_t a, string val);
    string gv.setv (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agsym_t a, string val);
    string gv.setv (SWIGTYPE_p_Agedge_t e, SWIGTYPE_p_Agsym_t a, string val);

Getting attribute values

Get value of named attribute of graph/node/edge
    string gv.getv (SWIGTYPE_p_Agraph_t g, string attr);
    string gv.getv (SWIGTYPE_p_Agnode_t n, string attr);
    string gv.getv (SWIGTYPE_p_Agedge_t e, string attr);

Get value of attribute of graph/node/edge (using attribute handle)
    string gv.getv (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agsym_t a);
    string gv.getv (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agsym_t a);
    string gv.getv (SWIGTYPE_p_Agedge_t e, SWIGTYPE_p_Agsym_t a);

Obtain names from handles
    string gv.nameof (SWIGTYPE_p_Agraph_t g);
    string gv.nameof (SWIGTYPE_p_Agnode_t n);
    string gv.nameof (SWIGTYPE_p_Agsym_t a);

Find handles from names
    SWIGTYPE_p_Agraph_t gv.findsubg (SWIGTYPE_p_Agraph_t g, string name);
    SWIGTYPE_p_Agnode_t gv.findnode (SWIGTYPE_p_Agraph_t g, string name);
    SWIGTYPE_p_Agedge_t gv.findedge (SWIGTYPE_p_Agnode_t t, SWIGTYPE_p_Agnode_t h);
    SWIGTYPE_p_Agsym_t gv.findattr (SWIGTYPE_p_Agraph_t g, string name);
    SWIGTYPE_p_Agsym_t gv.findattr (SWIGTYPE_p_Agnode_t n, string name);
    SWIGTYPE_p_Agsym_t gv.findattr (SWIGTYPE_p_Agedge_t e, string name);

Misc graph navigators returning handles
    SWIGTYPE_p_Agnode_t gv.headof (SWIGTYPE_p_Agedge_t e);
    SWIGTYPE_p_Agnode_t gv.tailof (SWIGTYPE_p_Agedge_t e);
    SWIGTYPE_p_Agraph_t gv.graphof (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agraph_t gv.graphof (SWIGTYPE_p_Agedge_t e);
    SWIGTYPE_p_Agraph_t gv.graphof (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agraph_t gv.rootof (SWIGTYPE_p_Agraph_t g);

Obtain handles of proto node/edge for setting default attribute values
    SWIGTYPE_p_Agnode_t gv.protonode (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agedge_t gv.protoedge (SWIGTYPE_p_Agraph_t g);

Iterators

Iteration termination tests
    bool gv.ok (SWIGTYPE_p_Agraph_t g);
    bool gv.ok (SWIGTYPE_p_Agnode_t n);
    bool gv.ok (SWIGTYPE_p_Agedge_t e);
    bool gv.ok (SWIGTYPE_p_Agsym_t a);

Iterate over subgraphs of a graph
    SWIGTYPE_p_Agraph_t gv.firstsubg (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agraph_t gv.nextsubg (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agraph_t sg);

Iterate over supergraphs of a graph (obscure and rarely useful)
    SWIGTYPE_p_Agraph_t gv.firstsupg (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agraph_t gv.nextsupg (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agraph_t sg);

Iterate over edges of a graph
    SWIGTYPE_p_Agedge_t gv.firstedge (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agedge_t gv.nextedge (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agedge_t e);

Iterate over outedges of a graph
    SWIGTYPE_p_Agedge_t gv.firstout (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agedge_t gv.nextout (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agedge_t e);

Iterate over edges of a node
    SWIGTYPE_p_Agedge_t gv.firstedge (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agedge_t gv.nextedge (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agedge_t e);

Iterate over out-edges of a node
    SWIGTYPE_p_Agedge_t gv.firstout (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agedge_t gv.nextout (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agedge_t e);

Iterate over head nodes reachable from out-edges of a node
    SWIGTYPE_p_Agnode_t gv.firsthead (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agnode_t gv.nexthead (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agnode_t h);

Iterate over in-edges of a graph
    SWIGTYPE_p_Agedge_t gv.firstin (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agedge_t gv.nextin (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agedge_t e);

Iterate over in-edges of a node
    SWIGTYPE_p_Agedge_t gv.firstin (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agedge_t gv.nextin (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agedge_t e);

Iterate over tail nodes reachable from in-edges of a node
    SWIGTYPE_p_Agnode_t gv.firsttail (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agnode_t gv.nexttail (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agnode_t t);

Iterate over nodes of a graph
    SWIGTYPE_p_Agnode_t gv.firstnode (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agnode_t gv.nextnode (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agnode_t n);

Iterate over nodes of an edge
    SWIGTYPE_p_Agnode_t gv.firstnode (SWIGTYPE_p_Agedge_t e);
    SWIGTYPE_p_Agnode_t gv.nextnode (SWIGTYPE_p_Agedge_t e, SWIGTYPE_p_Agnode_t n);

Iterate over attributes of a graph
    SWIGTYPE_p_Agsym_t gv.firstattr (SWIGTYPE_p_Agraph_t g);
    SWIGTYPE_p_Agsym_t gv.nextattr (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_Agsym_t a);

Iterate over attributes of an edge
    SWIGTYPE_p_Agsym_t gv.firstattr (SWIGTYPE_p_Agedge_t e);
    SWIGTYPE_p_Agsym_t gv.nextattr (SWIGTYPE_p_Agedge_t e, SWIGTYPE_p_Agsym_t a);

Iterate over attributes of a node
    SWIGTYPE_p_Agsym_t gv.firstattr (SWIGTYPE_p_Agnode_t n);
    SWIGTYPE_p_Agsym_t gv.nextattr (SWIGTYPE_p_Agnode_t n, SWIGTYPE_p_Agsym_t a);

Remove graph objects
    bool gv.rm (SWIGTYPE_p_Agraph_t g);
    bool gv.rm (SWIGTYPE_p_Agnode_t n);
    bool gv.rm (SWIGTYPE_p_Agedge_t e);

Layout

Annotate a graph with layout attributes and values using a specific layout engine
    bool gv.layout (SWIGTYPE_p_Agraph_t g, string engine);

Render

Render a layout into attributes of the graph
    bool gv.render (SWIGTYPE_p_Agraph_t g);

Render a layout to stdout
    bool gv.render (SWIGTYPE_p_Agraph_t g, string format);

Render to an open file
    bool gv.render (SWIGTYPE_p_Agraph_t g, string format, SWIGTYPE_p_FILE fout);

Render a layout to an unopened file by name
    bool gv.render (SWIGTYPE_p_Agraph_t g, string format, string filename);

Render to an open channel
    bool gv.renderchannel (SWIGTYPE_p_Agraph_t g, string format, string channelname);

Render to a string result
    gv.renderresult (SWIGTYPE_p_Agraph_t g, string format, string outdata);

Render a layout to a malloc'ed string, to be free'd by the caller

(deprecated - too easy to leak memory)
    string gv.renderdata (SWIGTYPE_p_Agraph_t g, string format);

Writing graph back to file
    bool gv.write (SWIGTYPE_p_Agraph_t g, string filename);
    bool gv.write (SWIGTYPE_p_Agraph_t g, SWIGTYPE_p_FILE f);

KEYWORDS
graph, dot, neato, fdp, circo, twopi, R.