fix single column graphs

diff --git a/driveGnuPlots.pl b/driveGnuPlots.pl
index 57f9b6c..7843b32 100755 (executable)
--- a/driveGnuPlots.pl
+++ b/driveGnuPlots.pl
@@ -83,6 +83,8 @@ sub main {
                        $vertical++;
                }
        }
+       $vertical--;
+       $y_size = $vertical if $vertical > $y_size;
        print "# grid $x_size x $y_size\n";
 
        my $info = `xwininfo -root`;