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       gcv - graph file converter


       gcv [options] [igfile] [ogfile] [oxfile]


       The  gcv program converts Scotch graph files from and to other external
       file formats.

       File igfile is converted into graph file ogfile, with optional geometry
       data being put in geometry file oxfile, if it is available.

       When file names are not specified, data is read from standard input and
       written to standard output. Standard streams  can  also  be  explicitly
       represented by a dash '-'.

       When  the  proper libraries have been included at compile time, gcv can
       directly handle compressed graphs, both as input and output.  A  stream
       is  treated  as  compressed  whenever  its  name  is  postfixed  with a
       compressed file extension, such as in  'brol.grf.bz2'  or  '-.gz'.  The
       compression  formats  which  can  be  supported  are  the  bzip2 format
       ('.bz2'), the gzip format ('.gz'), and the  lzma  format  ('.lzma',  on
       input only).


       -h     Display some help.

       -iifmt Set format of input graph file, which can be:

              bnum   Boeing-Harwell  format.  This  is  a matrix format.  Only
                     square  matrices  are  supported.  Square  matrices  with
                     unsymmetric  pattern  are  symmetrized.  In case the file
                     contains several matrices, the num  parameter  allow  the
                     user  to  provide  the  index  of  the matrix to convert,
                     starting from 0. When the num parameter is not set, it is
                     assumed to be 0.

              c      Chaco  format.  This  is  an adjacency graph format, also
                     used by MeTiS.

              m      Matrix Market format. This is a matrix format  describing
                     individual  edges.  Matrix  pattern  is symmetrized, such
                     that rectangular matrices are eventually squared.

              s      Scotch graph format. This is an adjacency graph format.

       -oofmt Set format of output graph file, which can be:

              c      Chaco format.

              m      Matrix Market symmetric pattern format.

              s      Scotch format. This is the default.

       -V     Display program version and copyright.


       Convert a Matrix Market graph into a Scotch graph. Matrix Market  files
       do not comprise geometry data, so no geometry file is needed on output:

           $ gcv -im brol.grf


       gbase(1), gtst(1), gmap(1), gord(1), gout(1).

       Scotch user's manual.


       Francois Pellegrini <>

                               February 14, 2011                        gcv(1)

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