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 symmetric square matrix

       c c.  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
              pattern 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
              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 non-zero if
       any error occurred.

AUTHORS
       Yifan Hu <yifanhu@research.att.com>
       Emden R. Gansner <erg@research.att.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)
