MM2GV
Section: User Commands (1)
Updated: 31 July 2008
Page Index
NAME
mm2gv  Matrix MarketDOT 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 symmetric square matrix
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 nonzero
entries is symmetric; otherwise, it will treat it as a bipartite graph as with the case of nonsquare
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 pattern
of nonzero 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 matrix will be treated like a bipartite graph.
 ooutfile

Prints output to the file outfile. If not given, mm2gv
uses stdout.
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 nonzero 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.