make.groups {lattice}  R Documentation 
Combines two or more vectors, possibly of different lengths, producing a data frame with a second column indicating which of these vectors that row came from. This is mostly useful for getting data into a form suitable for use in high level Lattice functions.
make.groups(...)
... 
one or more vectors of the same type (coercion is attempted if not) 
A data frame with two columns

all the vectors supplied, concatenated 

factor indicating which vector the corresponding data value
came from

Deepayan Sarkar Deepayan.Sarkar@Rproject.org
sim.dat < make.groups(uniform = runif(200), exponential = rexp(175), lognormal = rlnorm(150), normal = rnorm(125)) qqmath( ~ data  which, sim.dat, scales = list(y = "free"))