Two-Dimensional Visualization of Graphs
gplot produces a two-dimensional plot of graph
g in collection
dat. A variety of options are available to control vertex placement, display details, color, etc.
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- graphs, hplot
a graph or set thereof. This data may be valued.
integer indicating the index of the graph which is to be plotted. By default,
String indicating the type of graph being evaluated.
'digraph' indicates that edges should be interpreted as directed;
'graph' indicates that edges are undirected;
'twomode' indicates that data should be interpreted as two-mode (i.e., rows and columns are distinct vertex sets).
gmode is set to
'digraph' by default.
boolean indicating whether or not the diagonal should be treated as valid data. Set this true if and only if the data can contain loops.
FALSE by default.
a vector of vertex labels, if desired; defaults to the vertex index number.
user-specified vertex coordinates, in an NCOL(dat)x2 matrix. Where this is specified, it will override the
boolean; should the output be jittered?
real number indicating the lower threshold for tie values. Only ties of value >
thresh (by default in absolute value - see
thresh.absval)are displayed. By default,
boolean; should the absolute value of edge weights be used when thresholding? (Defaults to TRUE; setting to FALSE leads to thresholding by signed weights.)
boolean; should arrows (rather than line segments) be used to indicate edges?
the vertex placement algorithm; this must correspond to a
boolean; should isolates be displayed?
boolean; should interactive adjustment of vertex placement be attempted?
interactiveTRUE, should all vertices in the component be moved?
x axis label.
y axis label.
the x limits (min, max) of the plot.
the y limits of the plot.
amount to pad the plotting range; useful if labels are being clipped.
amount to pad label boxes (if
boxed.labelsTRUE), in character size units.
boolean; should vertex labels be displayed?
boolean; place vertex labels within boxes?
position at which labels should be placed, relative to vertices.
0 results in labels which are placed away from the center of the plotting region;
4 result in labels being placed below, to the left of, above, and to the right of vertices (respectively); and
label.pos>=5 results in labels which are plotted with no offset (i.e., at the vertex positions).
background color for label boxes (if
boxed.labelsTRUE); may be a vector, if boxes are to be of different colors.
boolean; should vertices be enclosed within circles? (Can increase legibility for polygonal vertices.)
number of polygon sides for vertices; may be given as a vector, if vertices are to be of different types. By default, 50 sides are used (or 50 and 4, for two-mode data).
angle of rotation for vertices (in degrees); may be given as a vector, if vertices are to be rotated differently.
expansion factor for edge arrowheads.
character expansion factor for label text.
expansion factor for loops; may be given as a vector, if loops are to be of different sizes.
expansion factor for vertices; may be given as a vector, if vertices are to be of different sizes.
color for edges; may be given as a vector or adjacency matrix, if edges are to be of different colors.
color for vertex labels; may be given as a vector, if labels are to be of different colors.
color for vertices; may be given as a vector, if vertices are to be of different colors. By default, red is used (or red and blue, for two-mode data).
label border colors (if
boxed.labelsTRUE); may be given as a vector, if label boxes are to have different colors.
border color for vertices; may be given as a vector, if vertex borders are to be of different colors.
line type for (positive weight) edges; may be given as a vector or adjacency matrix, if edges are to have different line types.
line type for negative weight edges, if any; may be given as per
line type for label boxes (if
boxed.labelsTRUE); may be given as a vector, if label boxes are to have different line types.
line type for vertex borders; may be given as a vector or adjacency matrix, if vertex borders are to have different line types.
line width scale for edges; if set greater than 0, edge widths are scaled by
edge.lwd*dat. May be given as a vector or adjacency matrix, if edges are to have different line widths.
line width for label boxes (if
boxed.labelsTRUE); may be given as a vector, if label boxes are to have different line widths.
uselenTRUE, curved edge lengths are scaled by
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usecurveTRUE, the extent of edge curvature is controlled by
edge.curv. May be given as a fixed value, vector, or adjacency matrix, if edges are to have different levels of curvature.
for curved edges (excluding loops), the number of line segments to use for the curve approximation.
for loops, the number of line segments to use for the curve approximation.
base length for plotting objects, as a fraction of the linear scale of the plotting region. Defaults to 0.01.
boolean; should we use
edge.len to rescale edge lengths?
boolean; should we use
boolean; suppress plotting of axes?
boolean; plot vertices after plotting edges?
boolean; create a new plot? If
newFALSE, vertices and edges will be added to the existing plot.
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parameters to the
gplot.layout function specified in
additional arguments to
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gplot is the standard network visualization tool within the
sna library. By means of clever selection of display parameters, a fair amount of display flexibility can be obtained. Graph layout -- if not specified directly using
coord -- is determined via one of the various available algorithms. These should be specified via the
mode argument; see
gplot.layout for a full list. User-supplied layout functions are also possible -- see the aforementioned man page for details.
Note that where
gmode'twomode', the supplied two-mode network is converted to bipartite form prior to computing coordinates (if not in that form already).
vertex.col or other settings may be used to differentiate row and column vertices -- by default, row vertices are drawn as red circles, and column vertices are rendered as blue squares. If
interactiveTRUE, then the user may modify the initial graph layout by selecting an individual vertex and then clicking on the location to which this vertex is to be moved; this process may be repeated until the layout is satisfactory. If
interact.bycompTRUE as well, the vertex and all other vertices in the same component as that vertex are moved together.
A two-column matrix containing the vertex positions as x,y coordinates.
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