# scotch_gotst (1) - Linux Manuals

## scotch_gotst: compute statistics on sparse matrix orderings

## NAME

**gomtst**- compute statistics on sparse matrix orderings

## SYNOPSIS

gotst[options] [gfile] [ofile] [lfile]

## DESCRIPTION

The**gotst**program computes, in a sequential way, statistics on a sparse matrix ordering, such as fill-in, operation count, and separator tree parameters: minimum, maximum, average height and variance of its leaves.

Source graph file *gfile* can only be a centralized graph file. File
*ofile* represents the ordering of the symmetric sparse matrix the
pattern of which is represented by *gfile*. The resulting statistics
are stored in file *lfile*. 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, gtst 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).

Since **gotst** performs sequentially the symbolic factorization of
matrix *gfile* in order to compute fill-in and operation count
numbers, this program can take a long time or even run out of memory,
when applied to very large graphs.

## OPTIONS

**-h**- Display some help.
**-V**- Display program version and copyright.

## EXAMPLE

Display statistics on ordering brol.ord of graph brol.grf:

$ gotst brol.grf brol.ord

## AUTHOR

Francois Pellegrini <francois.pellegrini [at] labri.fr>