A connection, or a character string naming the file to print
to. If "" (the default), the report is printed to the standard
output connection (the console unless redirected by sink).
If it is "|cmd", the
...
Arguments to be passed to method graph2latex like package and scale.
Value
None (invisible NULL).
Details
This function uses cat and graph2latex.
References
The TikZ and PGF Packages Manual for version 2.00,
Till Tantau,
http://www.ctan.org/tex-archive/graphics/pgf/base/doc/generic/pgf/pgfmanual.pdf