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Use cex.main or cex.sub to change the si …

Use cex.main or cex.sub to change the size of the title or subtitle in R

title(main="Main title", cex.main=0.85)
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R graph by examples http://rgraphics.li …

R graph by examples
http://rgraphics.limnology.wisc.edu/index.php

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R plot with examples http://www.hardi …

R plot with examples

http://www.harding.edu/fmccown/r/

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Title for muti plots in R mtext(‘Title …

Title for muti plots in R
mtext(‘Title’, outer=TRUE)

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Using a value of a variable in title …

Using a value of a variable in title

Use paste and eval.

plot(x, main = paste("Cluster", eval(i))
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Great illustration of plot and margin in …

Great illustration of plot and margin in R
http://research.stowers-institute.org/efg/R/Graphics/Basics/mar-oma/index.htm

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2nd axis in R Use axis. side is where t …

2nd axis in R
Use axis. side is where the second axis goes. Side 3 is the top x-axis. Side 4 is the right y-axis. With put the 1st axis thick for the at and lab is for the text.
Here is the example.
axis(side=3, at = c(0.1, 0.2, 0.3, 0.4, 0.5), lab = c(10, 5, 3, 2.5, 2))

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Multi plots in a page gridExtra package …

Multi plots in a page
gridExtra package makes it easier to put multiple plots generated by ggplot2 in a page equivalent to par(mfrow= ).
Example:
http://code.google.com/p/gridextra/wiki/arrange
came across through a conversation in StackOverflow
http://stackoverflow.com/questions/1249548/side-by-side-plots-with-ggplot2-in-r