12:40 >perl 1936_SoPW.pl
print (...) interpreted as function at 1936_SoPW.pl line 74.
Useless use of a constant ("\n") in void context at 1936_SoPW.pl line 74.

##</code><code>##

print ($graph->plot(\@point)) , "\n" ;

##</code><code>##

print +($graph->plot(\@point)) , "\n" ;

##</code><code>##

print $graph->plot(\@point), "\n" ;