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

**NAME**

gcv- graph file converter

**SYNOPSIS**

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

**DESCRIPTION**

Thegcvprogram converts Scotch graph files from and to other external file formats. Fileigfileis converted into graph fileogfile, with optional geometry data being put in geometry fileoxfile, 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,gcvcan 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).

**OPTIONS**

-hDisplay some help.-iifmtSet format of input graph file, which can be:bnumBoeing-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, thenumparameter allow the user to provide the index of the matrix to convert, starting from 0. When thenumparameter is not set, it is assumed to be 0.cChaco format. This is an adjacency graph format, also used by MeTiS.mMatrix Market format. This is a matrix format describing individual edges. Matrix pattern is symmetrized, such that rectangular matrices are eventually squared.sScotch graph format. This is an adjacency graph format.-oofmtSet format of output graph file, which can be:cChaco format.mMatrix Market symmetric pattern format.sScotch format. This is the default.-VDisplay program version and copyright.

**EXAMPLE**

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.mm brol.grf

**SEE** **ALSO**

gbase(1),gtst(1),gmap(1),gord(1),gout(1). Scotch user's manual.

**AUTHOR**

Francois Pellegrini <francois.pellegrini@labri.fr> February 14, 2011 gcv(1)