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% Generated by roxygen2 (4.1.1): do not edit by hand
% Please edit documentation in R/layout.R
\name{layout_with_fr}
\alias{layout_with_fr}
\alias{with_fr}
\title{The Fruchterman-Reingold layout algorithm}
\usage{
layout_with_fr(graph, coords = NULL, dim = 2, niter = 500,
start.temp = sqrt(vcount(graph)), grid = c("auto", "grid", "nogrid"),
weights = NULL, minx = NULL, maxx = NULL, miny = NULL, maxy = NULL,
minz = NULL, maxz = NULL, coolexp, maxdelta, area, repulserad, maxiter)
with_fr(...)
}
\arguments{
\item{graph}{The graph to lay out. Edge directions are ignored.}
\item{coords}{Optional starting positions for the vertices. If this argument
is not \code{NULL} then it should be an appropriate matrix of starting
coordinates.}
\item{dim}{Integer scalar, 2 or 3, the dimension of the layout. Two
dimensional layouts are places on a plane, three dimensional ones in the 3d
space.}
\item{niter}{Integer scalar, the number of iterations to perform.}
\item{start.temp}{Real scalar, the start temperature. This is the maximum
amount of movement alloved along one axis, within one step, for a vertex.
Currently it is decreased linearly to zero during the iteration.}
\item{grid}{Character scalar, whether to use the faster, but less accurate
grid based implementation of the algorithm. By default (\dQuote{auto}), the
grid-based implementation is used if the graph has more than one thousand
vertices.}
\item{weights}{A vector giving edge weights. The \code{weight} edge
attribute is used by default, if present. If weights are given, then the
attraction along the edges will be multiplied by the given edge weights.}
\item{minx}{If not \code{NULL}, then it must be a numeric vector that gives
lower boundaries for the \sQuote{x} coordinates of the vertices. The length
of the vector must match the number of vertices in the graph.}
\item{maxx}{Similar to \code{minx}, but gives the upper boundaries.}
\item{miny}{Similar to \code{minx}, but gives the lower boundaries of the
\sQuote{y} coordinates.}
\item{maxy}{Similar to \code{minx}, but gives the upper boundaries of the
\sQuote{y} coordinates.}
\item{minz}{Similar to \code{minx}, but gives the lower boundaries of the
\sQuote{z} coordinates.}
\item{maxz}{Similar to \code{minx}, but gives the upper boundaries of the
\sQuote{z} coordinates.}
\item{coolexp,maxdelta,area,repulserad}{These arguments are not supported
from igraph version 0.8.0 and are ignored (with a warning).}
\item{maxiter}{A deprecated synonym of \code{niter}, for compatibility.}
\item{...}{Passed to \code{layout_with_fr}.}
}
\value{
A two- or three-column matrix, each row giving the coordinates of a
vertex, according to the ids of the vertex ids.
}
\description{
Place vertices on the plane using the force-directed layout algorithm by
Fruchterman and Reingold.
}
\details{
See the referenced paper below for the details of the algorithm.
This function was rewritten from scratch in igraph version 0.8.0.
}
\examples{
# Fixing ego
g <- sample_pa(20, m=2)
minC <- rep(-Inf, vcount(g))
maxC <- rep(Inf, vcount(g))
minC[1] <- maxC[1] <- 0
co <- layout_with_fr(g, minx=minC, maxx=maxC,
miny=minC, maxy=maxC)
co[1,]
plot(g, layout=co, vertex.size=30, edge.arrow.size=0.2,
vertex.label=c("ego", rep("", vcount(g)-1)), rescale=FALSE,
xlim=range(co[,1]), ylim=range(co[,2]), vertex.label.dist=0,
vertex.label.color="red")
axis(1)
axis(2)
}
\author{
Gabor Csardi \email{csardi.gabor@gmail.com}
}
\references{
Fruchterman, T.M.J. and Reingold, E.M. (1991). Graph Drawing by
Force-directed Placement. \emph{Software - Practice and Experience},
21(11):1129-1164.
}
\seealso{
\code{\link{layout_with_drl}}, \code{\link{layout_with_kk}} for
other layout algorithms.
Other graph layouts: \code{\link{add_layout_}};
\code{\link{as_bipartite}},
\code{\link{layout.bipartite}},
\code{\link{layout_as_bipartite}}; \code{\link{as_star}},
\code{\link{layout.star}}, \code{\link{layout_as_star}};
\code{\link{as_tree}}, \code{\link{layout_as_tree}};
\code{\link{component_wise}}; \code{\link{in_circle}},
\code{\link{layout_in_circle}};
\code{\link{layout.auto}}, \code{\link{layout_nicely}},
\code{\link{nicely}};
\code{\link{layout.davidson.harel}},
\code{\link{layout_with_dh}}, \code{\link{with_dh}};
\code{\link{layout.gem}}, \code{\link{layout_with_gem}},
\code{\link{with_gem}}; \code{\link{layout.graphopt}},
\code{\link{layout_with_graphopt}},
\code{\link{with_graphopt}}; \code{\link{layout.grid}},
\code{\link{layout.grid.3d}},
\code{\link{layout.grid.3d}},
\code{\link{layout_on_grid}}, \code{\link{on_grid}};
\code{\link{layout.mds}}, \code{\link{layout_with_mds}},
\code{\link{with_mds}}; \code{\link{layout.merge}},
\code{\link{layout_components}},
\code{\link{merge_coords}},
\code{\link{piecewise.layout}},
\code{\link{piecewise.layout}};
\code{\link{layout.norm}}, \code{\link{norm_coords}};
\code{\link{layout.sugiyama}},
\code{\link{layout_with_sugiyama}},
\code{\link{with_sugiyama}};
\code{\link{layout_on_sphere}}, \code{\link{on_sphere}};
\code{\link{layout_randomly}}, \code{\link{randomly}};
\code{\link{layout_with_kk}}, \code{\link{with_kk}};
\code{\link{layout_with_lgl}}, \code{\link{with_lgl}};
\code{\link{layout}}, \code{\link{layout_}},
\code{\link{print.igraph_layout_modifier}},
\code{\link{print.igraph_layout_spec}};
\code{\link{normalize}}
}
\keyword{graphs}
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