Provided by: scotch_5.1.12b.dfsg-1_amd64 bug


       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

              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)