Empty plot
plot(1, type="n", axes=F, xlab="", ylab="")
1-dim arrays concatenation
from: http://rosettacode.org/wiki/Array_concatenation#R
a1 <- c(1, 2, 3)
a2 <- c(3, 4, 5)
a3 <- c(a1, a2)
Inverse matrix
If A is q squared non-singular nxn matrix, solve(A) is an nxn matrix giving the inverse of A.
source:
http://www.scribd.com/doc/6187359/R-Matrix-Tutor
Min/Max ranges for plotting
xlim = c(maxValue-0.1*maxValue, maxValue+0.1*maxValue)
specified within the 'plot()', gives extra margins around the plotted data