MM2GV(1) General Commands Manual MM2GV(1)
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NAME
mm2gv - Matrix Market-DOT converters
SYNOPSIS
mm2gv [ -cluv? ] [ -Ui ] [ -ooutfile ] [ file ]
DESCRIPTION
mm2gv converts a sparse matrix of the Matrix Market format to a graph in
the GV (formerly DOT) format. If the matrix M is not square, the graph
is considered bipartite and the matrix is viewed as a bipartite graph
adjacency matrix, with the rows and columns of the matrix specifying the
two sets of vertices. Equivalently, the matrix is converted into a sym-
metric square matrix
0 M
$M sup T$ 0
a block matrix with square blocks of 0's in the upper left and lower
right, the upper right block being M and the lower left block being the
transpose of M. This matrix is then viewed as the adjacency matrix of
the graph.
For a square matrix, mm2gv uses it directly as an adjacency matrix if
its pattern of non-zero entries is symmetric; otherwise, it will treat
it as a bipartite graph as with the case of non-square matrices. This
behavior can be modified by the -U flag.
OPTIONS
The following options are supported:
-c This flag causes mm2gv to assign colors to the edges. The matrix
element is scaled to the range [0,1] depending on where it lies
between the minimum and maximum set matrix values. This scaled
value is used as the "wt" attribute of the corresponding edge.
In addition, this scalar value is mapped to an RGB value, which
is stored as the edge "color".
-l If set, mm2gv attaches a label to the graph indicating the base
name of the input file, and the number of nodes and edges.
-u If specified, the graph is assumed to be undirected. By default,
the graph generated is directed.
-v This flag causes mm2gv to store the matrix values as the "len"
attribute of the corresponding edge.
-Ubflag
Specifies how square matrices are handled. If bflag is 0, a
square matrix will always be treated as an adjacency matrix. If
bflag is 1 (the default), a square matrix with a symmetric pat-
tern of non-zero entries will be used as an adjacency matrix;
otherwise, it will be used a bipartite graph. If bflag is 2, a
symmetric matrix will be used as an adjacency matrix; otherwise,
it will be used a bipartite graph. If bflag is 3, any input ma-
trix will be treated like a bipartite graph.
-ooutfile
Prints output to the file outfile. If not given, mm2gv uses std-
out.
OPERANDS
The following operand is supported:
file Name of the file in MatrixMarket format. If no file operand is
specified, the standard input will be used.
RETURN CODES
Return 0 if there were no problems during conversion; and non-zero if
any error occurred.
AUTHORS
Yifan Hu <yifanhu@yahoo.com>
Emden R. Gansner <erg@graphviz.com>
ADDITIONAL INFO
See http://math.nist.gov/MatrixMarket/ for description of the format and
http://www.cise.ufl.edu/research/sparse/matrices/ for a large collection
of sparse matrices in this format.
31 July 2008 MM2GV(1)
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