Let me start with an example:

par(mfrow=c(2,3))
for (i in 1:5){
     x = rnorm(100)
     y = .5*x + rnorm(100, 0, sqrt(1-.5^2))
     plot(x,y)
}

Note that there's five plots and six spaces for those plots via mfrow,
leaving one row empty. Is there a way to have the bottom two plots
centered? I think it looks weird to have them left-justified. Thanks in
advance for the help!

-- 
Dustin Fife
PhD Student
Quantitative Psychology
University of Oklahoma




AFZ:
I copied and pasted this from section 7.8 of our Beginner's Guide to R. 
It can easily be adapted for your problem.


 > MyLayOut <- matrix(c(2, 0, 1, 3), nrow = 2, ncol=2, byrow = TRUE)
 > nf <- layout(mat = MyLayOut, widths = c(3, 1), heights = c(1, 3), 
respect = TRUE)


 > xrange <- c(min(Benthic$NAP), max(Benthic$NAP))
 > yrange <- c(min(Benthic$Richness), max(Benthic$Richness))
 > #First graph
 > par(mar = c(4, 4, 2, 2))
 > plot(Benthic$NAP, Benthic$Richness, xlim = xrange, ylim = yrange, 
xlab = "NAP", ylab = "Richness")
 > #Second graph
 > par(mar = c(0, 3, 1, 1))
 > boxplot(Benthic$NAP, horizontal = TRUE, axes = FALSE, frame.plot = 
FALSE, ylim = xrange, space = 0) > #Third graph
 > par(mar = c(3, 0, 1, 1))
 > boxplot(Benthic$Richness, axes = FALSE, ylim = yrange, space = 0, 
horiz = TRUE)



Alain

-- 

Dr. Alain F. Zuur
First author of:

1. Analysing Ecological Data (2007).
Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p.
URL: www.springer.com/0-387-45967-7


2. Mixed effects models and extensions in ecology with R. (2009).
Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer.
http://www.springer.com/life+sci/ecology/book/978-0-387-87457-9


3. A Beginner's Guide to R (2009).
Zuur, AF, Ieno, EN, Meesters, EHWG. Springer
http://www.springer.com/statistics/computational/book/978-0-387-93836-3


4. Zero Inflated Models and Generalized Linear Mixed Models with R. (2012) Zuur, Saveliev, Ieno.
http://www.highstat.com/book4.htm

Other books: http://www.highstat.com/books.htm


Statistical consultancy, courses, data analysis and software
Highland Statistics Ltd.
6 Laverock road
UK - AB41 6FN Newburgh
Tel: 0044 1358 788177
Email: highstat@highstat.com
URL: www.highstat.com
URL: www.brodgar.com


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