1gord(1)                      Scotch user's manual                      gord(1)
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NAME

6       gord - compute sparse matrix orderings of graphs
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SYNOPSIS

9       gord [options] [gfile] [ofile] [lfile]
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DESCRIPTION

12       The gord program computes, in a sequential way, an ordering of a Scotch
13       source graph representing the pattern of some symmetric sparse matrix.
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15       Source graph file gfile can only  be  a  centralized  graph  file.  The
16       resulting  ordering  is stored in file ofile. Eventual logging informa‐
17       tion (such as the one produced by option -v) is  sent  to  file  lfile.
18       When file names are not specified, data is read from standard input and
19       written to standard output. Standard streams can  also  be  explicitely
20       represented by a dash '-'.
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22       When  the proper libraries have been included at compile time, gord can
23       directly handle compressed graphs, both as input and output.  A  stream
24       is  treated  as  compressed  whenever its name is postfixed with a com‐
25       pressed file extension, such as in 'brol.grf.bz2' or '-.gz'.  The  com‐
26       pression  formats which can be supported are the bzip2 format ('.bz2'),
27       the gzip format ('.gz'), and the lzma format ('.lzma', on input only).
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OPTIONS

30       -h     Display some help.
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32       -mmfile
33              Save column block mapping data to file mfile. Mapping data spec‐
34              ifies,  for  each vertex, the index of the column block to which
35              this vertex belongs.
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37       -ostrat
38              Use sequential graph ordering strategy strat (see Scotch  user's
39              manual for more information).
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41       -ttfile
42              Save  partitioning  tree  data  to file tfile. Partitioning tree
43              data specifies, for each vertex, the index of the  first  vertex
44              of  the  parent  block of the block to which the vertex belongs.
45              Altogether with the mapping data  provided  in  file  mfile,  it
46              allows  one  to rebuild the separator tree of the nested dissec‐
47              tion process.
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49       -V     Display program version and copyright.
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51       -vverb Set verbose mode to verb. It is a set of one of more  characters
52              which can be:
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54              s      strategy information.
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56              t      timing information.
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EXAMPLE

59       Reorder  matrix  graph brol.grf and save the resulting ordering to file
60       brol.ord using the default sequential graph ordering strategy:
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62             $ gord brol.grf brol.ord
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SEE ALSO

66       dgord(1), gmk_hy(1), gtst(1).
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68       Scotch user's manual.
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AUTHOR

71       Francois Pellegrini <francois.pellegrini@labri.fr>
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75                              September 08, 2008                       gord(1)
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