[R] multiple x factors using the sciplot package

Dear R community, I am a beginner using the sciplot package to graph barplots. I would like to be able to graph two x factors (Sampling.year and Period). Sampling.year: 2006, 2007, 2008, 2009 Period: First, Second, Total The parameter group is the different species I looked at. They

[R] One legend for a multiple graph page

Hi, I am using the Sciplot package to graph barplots. Since I put 4 barplots per page and that the legends are always the same, I would like to find a way to have only one legend per page. Also, I would like it to be centered in the middle of the page. I tried locator() without success.