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

           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@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)