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       mm2gv - Matrix Market-DOT converters


       mm2gv [ -cluv?  ] [ -Ui ] [ -ooutfile ] [ file ]


       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.


       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.

              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.

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

              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 0 if there were no problems during conversion; and non-zero if any error occurred.


       Yifan Hu <>
       Emden R. Gansner <>


       See   for   description    of    the    format    and   for   a  large  collection  of  sparse
       matrices in this format.

                                           31 July 2008                                  MM2GV(1)